Whamcloud - gitweb
LU-13485 libcfs: Parallel configure tests for libcfs
authorShaun Tancheff <shaun.tancheff@hpe.com>
Fri, 17 Feb 2023 23:23:36 +0000 (15:23 -0800)
committerAndreas Dilger <adilger@whamcloud.com>
Sat, 18 Feb 2023 19:14:36 +0000 (19:14 +0000)
Transform the compile tests in libcfs to run in parallel

Lustre-change: https://review.whamcloud.com/38349
Lustre-commit: 182fa9be075f5866aba2f37fbc3434cd0292ac0e

Test-Parameters: trivial
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I76ab65558dd456dc08d6ef4a1985455ce1f17913
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/49879
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
libcfs/autoconf/lustre-libcfs.m4

index fbae889..c1aa1d6 100644 (file)
@@ -51,34 +51,40 @@ AS_IF([test "x$enable_panic_dumplog" = xyes],
 #
 # Kernel version 3.11 introduced ktime_get_ts64
 #
-AC_DEFUN([LIBCFS_KTIME_GET_TS64],[
-LB_CHECK_COMPILE([does function 'ktime_get_ts64' exist],
-ktime_get_ts64, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       struct timespec64 *ts = NULL;
+AC_DEFUN([LIBCFS_SRC_KTIME_GET_TS64], [
+       LB2_LINUX_TEST_SRC([ktime_get_ts64], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               struct timespec64 *ts = NULL;
 
-       ktime_get_ts64(ts);
-],[
-       AC_DEFINE(HAVE_KTIME_GET_TS64, 1,
-               ['ktime_get_ts64' is available])
+               ktime_get_ts64(ts);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_GET_TS64], [
+       AC_MSG_CHECKING([does function 'ktime_get_ts64' exist])
+       LB2_LINUX_TEST_RESULT([ktime_get_ts64], [
+               AC_DEFINE(HAVE_KTIME_GET_TS64, 1,
+                       ['ktime_get_ts64' is available])
+       ])
 ]) # LIBCFS_KTIME_GET_TS64
 
 #
 # Kernel version 3.12-rc4 commit c2d816443ef30 added prepare_to_wait_event()
 #
-AC_DEFUN([LIBCFS_PREPARE_TO_WAIT_EVENT],[
-LB_CHECK_COMPILE([does function 'prepare_to_wait_event' exist],
-prepare_to_wait_event, [
-       #include <linux/wait.h>
-],[
-       prepare_to_wait_event(NULL, NULL, 0);
-],[
-       AC_DEFINE(HAVE_PREPARE_TO_WAIT_EVENT, 1,
-               ['prepare_to_wait_event' is available])
+AC_DEFUN([LIBCFS_SRC_PREPARE_TO_WAIT_EVENT],[
+       LB2_LINUX_TEST_SRC([prepare_to_wait_event], [
+               #include <linux/wait.h>
+       ],[
+               prepare_to_wait_event(NULL, NULL, 0);
+       ])
 ])
+AC_DEFUN([LIBCFS_PREPARE_TO_WAIT_EVENT],[
+       AC_MSG_CHECKING([does function 'prepare_to_wait_event' exist])
+       LB2_LINUX_TEST_RESULT([prepare_to_wait_event], [
+               AC_DEFINE(HAVE_PREPARE_TO_WAIT_EVENT, 1,
+                       ['prepare_to_wait_event' is available])
+       ])
 ]) # LIBCFS_PREPARE_TO_WAIT_EVENT
 
 #
@@ -86,114 +92,129 @@ prepare_to_wait_event, [
 # This has been backported to all lustre supported
 # clients except RHEL6. We have to handle the differences.
 #
-AC_DEFUN([LIBCFS_KERNEL_PARAM_OPS],[
-LB_CHECK_COMPILE([does 'struct kernel_param_ops' exist],
-kernel_param_ops, [
-       #include <linux/module.h>
-],[
-       struct kernel_param_ops ops;
+AC_DEFUN([LIBCFS_SRC_KERNEL_PARAM_OPS],[
+       LB2_LINUX_TEST_SRC([kernel_param_ops], [
+               #include <linux/module.h>
+       ],[
+               struct kernel_param_ops ops;
 
-       ops.set = NULL;
-],[
-       AC_DEFINE(HAVE_KERNEL_PARAM_OPS, 1,
-               ['struct kernel_param_ops' is available])
+               ops.set = NULL;
+       ])
 ])
+AC_DEFUN([LIBCFS_KERNEL_PARAM_OPS],[
+       AC_MSG_CHECKING([does 'struct kernel_param_ops' exist])
+       LB2_LINUX_TEST_RESULT([kernel_param_ops], [
+               AC_DEFINE(HAVE_KERNEL_PARAM_OPS, 1,
+                       ['struct kernel_param_ops' is available])
+       ])
 ]) # LIBCFS_KERNEL_PARAM_OPS
 
 #
 # Kernel version 3.12 introduced ktime_add
 #
-AC_DEFUN([LIBCFS_KTIME_ADD],[
-LB_CHECK_COMPILE([does function 'ktime_add' exist],
-ktime_add, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       ktime_t start = ktime_set(0, 0);
-       ktime_t end = start;
-       ktime_t total;
+AC_DEFUN([LIBCFS_SRC_KTIME_ADD],[
+       LB2_LINUX_TEST_SRC([ktime_add], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               ktime_t start = ktime_set(0, 0);
+               ktime_t end = start;
+               ktime_t total;
 
-       total = ktime_add(start, end);
-],[
-       AC_DEFINE(HAVE_KTIME_ADD, 1,
-               [ktime_add is available])
+               total = ktime_add(start, end);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_ADD],[
+       AC_MSG_CHECKING([does function 'ktime_add' exist])
+       LB2_LINUX_TEST_RESULT([ktime_add], [
+               AC_DEFINE(HAVE_KTIME_ADD, 1, [ktime_add is available])
+       ])
 ]) # LIBCFS_KTIME_ADD
 
 #
 # Kernel version 3.12 introduced ktime_after
 #
-AC_DEFUN([LIBCFS_KTIME_AFTER],[
-LB_CHECK_COMPILE([does function 'ktime_after' exist],
-ktime_after, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       ktime_t start = ktime_set(0, 0);
-       ktime_t end = start;
+AC_DEFUN([LIBCFS_SRC_KTIME_AFTER],[
+       LB2_LINUX_TEST_SRC([ktime_after], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               ktime_t start = ktime_set(0, 0);
+               ktime_t end = start;
 
-       ktime_after(start, end);
-],[
-       AC_DEFINE(HAVE_KTIME_AFTER, 1,
-               [ktime_after is available])
+               ktime_after(start, end);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_AFTER],[
+       AC_MSG_CHECKING([does function 'ktime_after' exist])
+       LB2_LINUX_TEST_RESULT([ktime_after], [
+               AC_DEFINE(HAVE_KTIME_AFTER, 1, [ktime_after is available])
+       ])
 ]) # LIBCFS_KTIME_AFTER
 
 #
 # Kernel version 3.12 introduced ktime_before
 # See linux commit 67cb9366ff5f99868100198efba5ca88aaa6ad25
 #
-AC_DEFUN([LIBCFS_KTIME_BEFORE],[
-LB_CHECK_COMPILE([does function 'ktime_before' exist],
-ktime_before, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       ktime_t start = ktime_set(0, 0);
-       ktime_t end = start;
+AC_DEFUN([LIBCFS_SRC_KTIME_BEFORE],[
+       LB2_LINUX_TEST_SRC([ktime_before], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               ktime_t start = ktime_set(0, 0);
+               ktime_t end = start;
 
-       ktime_before(start, end);
-],[
-       AC_DEFINE(HAVE_KTIME_BEFORE, 1,
-               [ktime_before is available])
+               ktime_before(start, end);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_BEFORE],[
+       AC_MSG_CHECKING([does function 'ktime_before' exist])
+       LB2_LINUX_TEST_RESULT([ktime_before], [
+               AC_DEFINE(HAVE_KTIME_BEFORE, 1, [ktime_before is available])
+       ])
 ]) # LIBCFS_KTIME_BEFORE
 
 #
 # Kernel version 3.12 introduced ktime_compare
 #
-AC_DEFUN([LIBCFS_KTIME_COMPARE],[
-LB_CHECK_COMPILE([does function 'ktime_compare' exist],
-ktime_compare, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       ktime_t start = ktime_set(0, 0);
-       ktime_t end = start;
+AC_DEFUN([LIBCFS_SRC_KTIME_COMPARE],[
+       LB2_LINUX_TEST_SRC([ktime_compare], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               ktime_t start = ktime_set(0, 0);
+               ktime_t end = start;
 
-       ktime_compare(start, end);
-],[
-       AC_DEFINE(HAVE_KTIME_COMPARE, 1,
-               [ktime_compare is available])
+               ktime_compare(start, end);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_COMPARE],[
+       AC_MSG_CHECKING([does function 'ktime_compare' exist])
+       LB2_LINUX_TEST_RESULT([ktime_compare], [
+               AC_DEFINE(HAVE_KTIME_COMPARE, 1,
+                       [ktime_compare is available])
+       ])
 ]) # LIBCFS_KTIME_COMPARE
 
 #
 # FC19 3.12 kernel struct shrinker change
 #
-AC_DEFUN([LIBCFS_SHRINKER_COUNT],[
-LB_CHECK_COMPILE([shrinker has 'count_objects'],
-shrinker_count_objects, [
-       #include <linux/mmzone.h>
-       #include <linux/shrinker.h>
-],[
-       struct shrinker shrinker;
+AC_DEFUN([LIBCFS_SRC_SHRINKER_COUNT],[
+       LB2_LINUX_TEST_SRC([shrinker_count_objects], [
+               #include <linux/mmzone.h>
+               #include <linux/shrinker.h>
+       ],[
+               struct shrinker shrinker;
 
-       shrinker.count_objects = NULL;
-],[
-       AC_DEFINE(HAVE_SHRINKER_COUNT, 1,
-               [shrinker has count_objects member])
+               shrinker.count_objects = NULL;
+       ])
 ])
+AC_DEFUN([LIBCFS_SHRINKER_COUNT],[
+       AC_MSG_CHECKING([shrinker has 'count_objects'])
+       LB2_LINUX_TEST_RESULT([shrinker_count_objects], [
+               AC_DEFINE(HAVE_SHRINKER_COUNT, 1,
+                       [shrinker has count_objects member])
+       ])
 ]) # LIBCFS_SHRINKER_COUNT
 
 #
@@ -201,38 +222,22 @@ shrinker_count_objects, [
 #
 # kernel 3.15-rc4 commit 71d8e532b1549a478e6a6a8a44f309d050294d00
 # start adding the tag to iov_iter
-# kernel 5.13 commit 8cd54c1c848031a87820e58d772166ffdf8c08c0 change
-# ->type to ->iter_type
 #
+AC_DEFUN([LIBCFS_SRC_IOV_ITER_HAS_TYPE], [
+       LB2_LINUX_TEST_SRC([iov_iter_has_type_member], [
+               #include <linux/uio.h>
+       ],[
+               struct iov_iter iter = { .type = ITER_KVEC };
+               (void)iter;
+       ],
+       [-Werror])
+])
 AC_DEFUN([LIBCFS_IOV_ITER_HAS_TYPE], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-iter_type_member=no
-LB_CHECK_COMPILE([if iov_iter has member type],
-iov_iter_has_type_member, [
-       #include <linux/uio.h>
-],[
-       struct iov_iter iter = { .type = ITER_KVEC };
-       (void)iter;
-],[
-       AC_DEFINE(HAVE_IOV_ITER_HAS_TYPE_MEMBER, 1,
-               [if iov_iter has member type])
-       iter_type_member=yes
-])
-if test $iter_type_member = no; then
-  LB_CHECK_COMPILE([if iov_iter has member iter_type],
-  iov_iter_has_iter_type_member, [
-       #include <linux/uio.h>
-  ],[
-       struct iov_iter iter = { .iter_type = ITER_KVEC };
-       (void)iter;
-  ],[
-       AC_DEFINE(HAVE_IOV_ITER_HAS_TYPE_MEMBER, 1,
-               [if iov_iter has member iter_type])
-       iter_type_member=yes
-  ])
-fi
-EXTRA_KCFLAGS="$tmp_flags"
+       AC_MSG_CHECKING([if iov_iter has member type])
+       LB2_LINUX_TEST_RESULT([iov_iter_has_type_member], [
+               AC_DEFINE(HAVE_IOV_ITER_HAS_TYPE_MEMBER, 1,
+                       [if iov_iter has member type])
+       ])
 ]) # LIBCFS_IOV_ITER_HAS_TYPE
 
 #
@@ -241,213 +246,249 @@ EXTRA_KCFLAGS="$tmp_flags"
 # Kernel version 4.16-rc3 commit a84d1169164b274f13b97a23ff235c000efe3b49
 # introduced struct __kernel_old_timeval
 #
-AC_DEFUN([LIBCFS_HAVE_NS_TO_TIMESPEC64],[
-LB_CHECK_COMPILE([does 'ns_to_timespec64()' exist],
-kernel_old_timeval, [
-       #include <linux/time.h>
-],[
-       struct timespec64 kts;
+AC_DEFUN([LIBCFS_SRC_HAVE_NS_TO_TIMESPEC64],[
+       LB2_LINUX_TEST_SRC([kernel_old_timeval], [
+               #include <linux/time.h>
+       ],[
+               struct timespec64 kts;
 
-       kts = ns_to_timespec64(0);
-],[
-       AC_DEFINE(HAVE_NS_TO_TIMESPEC64, 1,
-               [ns_to_timespec64() is available])
+               kts = ns_to_timespec64(0);
+       ])
 ])
+AC_DEFUN([LIBCFS_HAVE_NS_TO_TIMESPEC64],[
+       AC_MSG_CHECKING([does 'ns_to_timespec64()' exist])
+       LB2_LINUX_TEST_RESULT([kernel_old_timeval], [
+               AC_DEFINE(HAVE_NS_TO_TIMESPEC64, 1,
+                       [ns_to_timespec64() is available])
+       ])
 ]) # LIBCFS_HAVE_NS_TO_TIMESPEC64
 
 #
 # Kernel version 3.17 changed hlist_add_after to
 # hlist_add_behind
 #
-AC_DEFUN([LIBCFS_HLIST_ADD_AFTER],[
-LB_CHECK_COMPILE([does function 'hlist_add_after' exist],
-hlist_add_after, [
-       #include <linux/list.h>
-],[
-       hlist_add_after(NULL, NULL);
-],[
-       AC_DEFINE(HAVE_HLIST_ADD_AFTER, 1,
-               [hlist_add_after is available])
+AC_DEFUN([LIBCFS_SRC_HLIST_ADD_AFTER],[
+       LB2_LINUX_TEST_SRC([hlist_add_after], [
+               #include <linux/list.h>
+       ],[
+               hlist_add_after(NULL, NULL);
+       ])
 ])
+AC_DEFUN([LIBCFS_HLIST_ADD_AFTER],[
+       AC_MSG_CHECKING([does function 'hlist_add_after' exist])
+       LB2_LINUX_TEST_RESULT([hlist_add_after], [
+               AC_DEFINE(HAVE_HLIST_ADD_AFTER, 1,
+                       [hlist_add_after is available])
+       ])
 ]) # LIBCFS_HLIST_ADD_AFTER
 
 #
 # Kernel version 3.17 introduced struct timespec64
 #
-AC_DEFUN([LIBCFS_TIMESPEC64],[
-LB_CHECK_COMPILE([does 'struct timespec64' exist],
-timespec64, [
-       #include <linux/time.h>
-],[
-       struct timespec64 ts;
+AC_DEFUN([LIBCFS_SRC_TIMESPEC64],[
+       LB2_LINUX_TEST_SRC([timespec64], [
+               #include <linux/time.h>
+       ],[
+               struct timespec64 ts;
 
-       ts.tv_sec = 0;
-       ts.tv_nsec = 0;
-],[
-       AC_DEFINE(HAVE_TIMESPEC64, 1,
-               ['struct timespec64' is available])
+               ts.tv_sec = 0;
+               ts.tv_nsec = 0;
+       ])
 ])
+AC_DEFUN([LIBCFS_TIMESPEC64],[
+       AC_MSG_CHECKING([does 'struct timespec64' exist])
+       LB2_LINUX_TEST_RESULT([timespec64], [
+               AC_DEFINE(HAVE_TIMESPEC64, 1,
+                       ['struct timespec64' is available])
+       ])
 ]) # LIBCFS_TIMESPEC64
 
 #
 # Kernel version 3.17 introduced ktime_get_real_ts64
 #
-AC_DEFUN([LIBCFS_KTIME_GET_REAL_TS64],[
-LB_CHECK_COMPILE([does function 'ktime_get_real_ts64' exist],
-ktime_get_real_ts64, [
-       #include <linux/ktime.h>
-],[
-       struct timespec64 *ts = NULL;
+AC_DEFUN([LIBCFS_SRC_KTIME_GET_REAL_TS64],[
+       LB2_LINUX_TEST_SRC([ktime_get_real_ts64], [
+               #include <linux/ktime.h>
+       ],[
+               struct timespec64 *ts = NULL;
 
-       ktime_get_real_ts64(ts);
-],[
-       AC_DEFINE(HAVE_KTIME_GET_REAL_TS64, 1,
-               ['ktime_get_real_ts64' is available])
+               ktime_get_real_ts64(ts);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_GET_REAL_TS64],[
+       AC_MSG_CHECKING([does function 'ktime_get_real_ts64' exist])
+       LB2_LINUX_TEST_RESULT([ktime_get_real_ts64], [
+               AC_DEFINE(HAVE_KTIME_GET_REAL_TS64, 1,
+                       ['ktime_get_real_ts64' is available])
+       ])
 ]) # LIBCFS_KTIME_GET_REAL_TS64
 
 #
 # Kernel version 3.17 introduced ktime_get_real_seconds
 #
-AC_DEFUN([LIBCFS_KTIME_GET_REAL_SECONDS],[
-LB_CHECK_COMPILE([does function 'ktime_get_real_seconds' exist],
-ktime_get_real_seconds, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       time64_t now;
+AC_DEFUN([LIBCFS_SRC_KTIME_GET_REAL_SECONDS],[
+       LB2_LINUX_TEST_SRC([ktime_get_real_seconds], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               time64_t now;
 
-       now = ktime_get_real_seconds();
-],[
-       AC_DEFINE(HAVE_KTIME_GET_REAL_SECONDS, 1,
-               ['ktime_get_real_seconds' is available])
+               now = ktime_get_real_seconds();
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_GET_REAL_SECONDS],[
+       AC_MSG_CHECKING([does function 'ktime_get_real_ts64' exist])
+       LB2_LINUX_TEST_RESULT([ktime_get_real_seconds], [
+               AC_DEFINE(HAVE_KTIME_GET_REAL_SECONDS, 1,
+                       ['ktime_get_real_seconds' is available])
+       ])
 ]) # LIBCFS_KTIME_GET_REAL_SECONDS
 
 #
 # Kernel version 3.17 created ktime_get_ns wrapper
 #
-AC_DEFUN([LIBCFS_KTIME_GET_NS],[
-LB_CHECK_COMPILE([does function 'ktime_get_ns' exist],
-ktime_get_ns, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       u64 nanoseconds;
+AC_DEFUN([LIBCFS_SRC_KTIME_GET_NS],[
+       LB2_LINUX_TEST_SRC([ktime_get_ns], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               u64 nanoseconds;
 
-       nanoseconds = ktime_get_ns();
-],[],[
-       AC_DEFINE(NEED_KTIME_GET_NS, 1,
-               ['ktime_get_ns' is not available])
+               nanoseconds = ktime_get_ns();
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_GET_NS],[
+       AC_MSG_CHECKING([does function 'ktime_get_ns' exist])
+       LB2_LINUX_TEST_RESULT([ktime_get_ns], [],[
+               AC_DEFINE(NEED_KTIME_GET_NS, 1,
+                       ['ktime_get_ns' is not available])
+       ])
 ]) # LIBCFS_KTIME_GET_NS
 
 #
 # Kernel version 3.17 created ktime_get_real_ns wrapper
 #
-AC_DEFUN([LIBCFS_KTIME_GET_REAL_NS],[
-LB_CHECK_COMPILE([does function 'ktime_get_real_ns' exist],
-ktime_get_real_ns, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       u64 nanoseconds;
+AC_DEFUN([LIBCFS_SRC_KTIME_GET_REAL_NS],[
+       LB2_LINUX_TEST_SRC([ktime_get_real_ns], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               u64 nanoseconds;
 
-       nanoseconds = ktime_get_real_ns();
-],[],[
-       AC_DEFINE(NEED_KTIME_GET_REAL_NS, 1,
-               ['ktime_get_real_ns' is not available])
+               nanoseconds = ktime_get_real_ns();
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_GET_REAL_NS],[
+       AC_MSG_CHECKING([does function 'ktime_get_real_ns' exist])
+       LB2_LINUX_TEST_RESULT([ktime_get_real_ns], [],[
+               AC_DEFINE(NEED_KTIME_GET_REAL_NS, 1,
+                       ['ktime_get_real_ns' is not available])
+       ])
 ]) # LIBCFS_KTIME_GET_REAL_NS
 
 #
 # Kernel version 3.17 introduced ktime_to_timespec64
 #
-AC_DEFUN([LIBCFS_KTIME_TO_TIMESPEC64],[
-LB_CHECK_COMPILE([does function 'ktime_to_timespec64' exist],
-ktime_to_timespec64, [
-       #include <linux/hrtimer.h>
-       #include <linux/ktime.h>
-],[
-       ktime_t now = ktime_set(0, 0);
-       struct timespec64 ts;
+AC_DEFUN([LIBCFS_SRC_KTIME_TO_TIMESPEC64],[
+       LB2_LINUX_TEST_SRC([ktime_to_timespec64], [
+               #include <linux/hrtimer.h>
+               #include <linux/ktime.h>
+       ],[
+               ktime_t now = ktime_set(0, 0);
+               struct timespec64 ts;
 
-       ts = ktime_to_timespec64(now);
-],[
-       AC_DEFINE(HAVE_KTIME_TO_TIMESPEC64, 1,
-               ['ktime_to_timespec64' is available])
+               ts = ktime_to_timespec64(now);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_TO_TIMESPEC64],[
+       AC_MSG_CHECKING([does function 'ktime_to_timespec64' exist])
+       LB2_LINUX_TEST_RESULT([ktime_to_timespec64], [
+               AC_DEFINE(HAVE_KTIME_TO_TIMESPEC64, 1,
+                       ['ktime_to_timespec64' is available])
+       ])
 ]) # LIBCFS_KTIME_TO_TIMESPEC64
 
 #
 # Kernel version 3.17 introduced timespec64_sub
 #
-AC_DEFUN([LIBCFS_TIMESPEC64_SUB],[
-LB_CHECK_COMPILE([does function 'timespec64_sub' exist],
-timespec64_sub, [
-       #include <linux/time.h>
-],[
-       struct timespec64 later = { }, earlier = { }, diff;
+AC_DEFUN([LIBCFS_SRC_TIMESPEC64_SUB],[
+       LB2_LINUX_TEST_SRC([timespec64_sub], [
+               #include <linux/time.h>
+       ],[
+               struct timespec64 later = { }, earlier = { }, diff;
 
-       diff = timespec64_sub(later, earlier);
-],[
-       AC_DEFINE(HAVE_TIMESPEC64_SUB, 1,
-               ['timespec64_sub' is available])
+               diff = timespec64_sub(later, earlier);
+       ])
 ])
+AC_DEFUN([LIBCFS_TIMESPEC64_SUB],[
+       AC_MSG_CHECKING([does function 'timespec64_sub' exist])
+       LB2_LINUX_TEST_RESULT([timespec64_sub], [
+               AC_DEFINE(HAVE_TIMESPEC64_SUB, 1,
+                       ['timespec64_sub' is available])
+       ])
 ]) # LIBCFS_TIMESPEC64_SUB
 
 #
 # Kernel version 3.17 introduced timespec64_to_ktime
 #
-AC_DEFUN([LIBCFS_TIMESPEC64_TO_KTIME],[
-LB_CHECK_COMPILE([does function 'timespec64_to_ktime' exist],
-timespec64_to_ktime, [
+AC_DEFUN([LIBCFS_SRC_TIMESPEC64_TO_KTIME],[
+       LB2_LINUX_TEST_SRC([timespec64_to_ktime], [
        #include <linux/ktime.h>
-],[
-       struct timespec64 ts;
-       ktime_t now;
+       ],[
+               struct timespec64 ts;
+               ktime_t now;
 
-       now = timespec64_to_ktime(ts);
-],[
-       AC_DEFINE(HAVE_TIMESPEC64_TO_KTIME, 1,
-               ['timespec64_to_ktime' is available])
+               now = timespec64_to_ktime(ts);
+       ])
 ])
+AC_DEFUN([LIBCFS_TIMESPEC64_TO_KTIME],[
+       AC_MSG_CHECKING([does function 'timespec64_to_ktime' exist])
+       LB2_LINUX_TEST_RESULT([timespec64_to_ktime], [
+               AC_DEFINE(HAVE_TIMESPEC64_TO_KTIME, 1,
+                       ['timespec64_to_ktime' is available])
+       ])
 ]) # LIBCFS_TIMESPEC64_TO_KTIME
 
 #
 # Kernel version 3.19 introduced ktime_get_seconds
 #
-AC_DEFUN([LIBCFS_KTIME_GET_SECONDS],[
-LB_CHECK_COMPILE([does function 'ktime_get_seconds' exist],
-ktime_get_seconds, [
-       #include <linux/ktime.h>
-],[
-       time64_t now;
+AC_DEFUN([LIBCFS_SRC_KTIME_GET_SECONDS],[
+       LB2_LINUX_TEST_SRC([ktime_get_seconds], [
+               #include <linux/ktime.h>
+       ],[
+               time64_t now;
 
-       now = ktime_get_seconds();
-],[
-       AC_DEFINE(HAVE_KTIME_GET_SECONDS, 1,
-               ['ktime_get_seconds' is available])
+               now = ktime_get_seconds();
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_GET_SECONDS],[
+       AC_MSG_CHECKING([does function 'ktime_get_seconds' exist])
+       LB2_LINUX_TEST_RESULT([ktime_get_seconds], [
+               AC_DEFINE(HAVE_KTIME_GET_SECONDS, 1,
+                       ['ktime_get_seconds' is available])
+       ])
 ]) # LIBCFS_KTIME_GET_SECONDS
 
 #
 # Kernel version 4.0 commit 41fbf3b39d5eca01527338b4d0ee15ee1ae1023c
 # introduced the helper function ktime_ms_delta.
 #
-AC_DEFUN([LIBCFS_KTIME_MS_DELTA],[
-LB_CHECK_COMPILE([does function 'ktime_ms_delta' exist],
-ktime_ms_delta, [
-       #include <linux/ktime.h>
-],[
-       ktime_t start = ktime_set(0, 0);
-       ktime_t end = start;
+AC_DEFUN([LIBCFS_SRC_KTIME_MS_DELTA],[
+       LB2_LINUX_TEST_SRC([ktime_ms_delta], [
+               #include <linux/ktime.h>
+       ],[
+               ktime_t start = ktime_set(0, 0);
+               ktime_t end = start;
 
-       ktime_ms_delta(start, end);
-],[
-       AC_DEFINE(HAVE_KTIME_MS_DELTA, 1,
-               ['ktime_ms_delta' is available])
+               ktime_ms_delta(start, end);
+       ])
 ])
+AC_DEFUN([LIBCFS_KTIME_MS_DELTA],[
+       AC_MSG_CHECKING([does function 'ktime_ms_delta' exist])
+       LB2_LINUX_TEST_RESULT([ktime_ms_delta], [
+               AC_DEFINE(HAVE_KTIME_MS_DELTA, 1,
+                       ['ktime_ms_delta' is available])
+       ])
 ]) # LIBCFS_KTIME_MS_DELTA
 
 #
@@ -456,35 +497,41 @@ ktime_ms_delta, [
 # kernels you have to use __kernel_param_[un]lock(). In that case its
 # a global lock for all modules but that is okay since its a rare event.
 #
-AC_DEFUN([LIBCFS_KERNEL_PARAM_LOCK],[
-LB_CHECK_COMPILE([does function 'kernel_param_[un]lock' exist],
-kernel_param_lock, [
-       #include <linux/moduleparam.h>
-],[
-       kernel_param_lock(NULL);
-       kernel_param_unlock(NULL);
-],[
-       AC_DEFINE(HAVE_KERNEL_PARAM_LOCK, 1,
-               ['kernel_param_[un]lock' is available])
+AC_DEFUN([LIBCFS_SRC_KERNEL_PARAM_LOCK],[
+       LB2_LINUX_TEST_SRC([kernel_param_lock], [
+               #include <linux/moduleparam.h>
+       ],[
+               kernel_param_lock(NULL);
+               kernel_param_unlock(NULL);
+       ])
 ])
+AC_DEFUN([LIBCFS_KERNEL_PARAM_LOCK],[
+       AC_MSG_CHECKING([does function 'kernel_param_[un]lock' exist])
+       LB2_LINUX_TEST_RESULT([kernel_param_lock], [
+               AC_DEFINE(HAVE_KERNEL_PARAM_LOCK, 1,
+                       ['kernel_param_[un]lock' is available])
+       ])
 ]) # LIBCFS_KERNEL_PARAM_LOCK
 
 #
 # Kernel version 4.2 changed topology_thread_cpumask
 # to topology_sibling_cpumask
 #
-AC_DEFUN([LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK],[
-LB_CHECK_COMPILE([does function 'topology_sibling_cpumask' exist],
-topology_sibling_cpumask, [
-       #include <linux/topology.h>
-],[
-       const struct cpumask *mask;
+AC_DEFUN([LIBCFS_SRC_HAVE_TOPOLOGY_SIBLING_CPUMASK],[
+       LB2_LINUX_TEST_SRC([topology_sibling_cpumask], [
+               #include <linux/topology.h>
+       ],[
+               const struct cpumask *mask;
 
-       mask = topology_sibling_cpumask(0);
-],[
-       AC_DEFINE(HAVE_TOPOLOGY_SIBLING_CPUMASK, 1,
-               [topology_sibling_cpumask is available])
+               mask = topology_sibling_cpumask(0);
+       ])
 ])
+AC_DEFUN([LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK],[
+       AC_MSG_CHECKING([does function 'topology_sibling_cpumask' exist])
+       LB2_LINUX_TEST_RESULT([topology_sibling_cpumask], [
+               AC_DEFINE(HAVE_TOPOLOGY_SIBLING_CPUMASK, 1,
+                       [topology_sibling_cpumask is available])
+       ])
 ]) # LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK
 
 #
@@ -509,52 +556,61 @@ gfpflags_allow_blocking, [
 # Kernel version 4.4 commit ef951599074ba4fad2d0efa0a977129b41e6d203
 # introduced kstrtobool and kstrtobool_from_user.
 #
-AC_DEFUN([LIBCFS_KSTRTOBOOL_FROM_USER], [
-LB_CHECK_COMPILE([if Linux kernel has 'kstrtobool_from_user'],
-kstrtobool_from_user, [
-       #include <linux/kernel.h>
-],[
-       bool result;
-       return kstrtobool_from_user(NULL, 0, &result);
-],[
-       AC_DEFINE(HAVE_KSTRTOBOOL_FROM_USER, 1,
-               [kernel has kstrtobool_from_user])
+AC_DEFUN([LIBCFS_SRC_KSTRTOBOOL_FROM_USER], [
+       LB2_LINUX_TEST_SRC([kstrtobool_from_user], [
+               #include <linux/kernel.h>
+       ],[
+               bool result;
+               return kstrtobool_from_user(NULL, 0, &result);
+       ])
 ])
+AC_DEFUN([LIBCFS_KSTRTOBOOL_FROM_USER], [
+       AC_MSG_CHECKING([if Linux kernel has 'kstrtobool_from_user'])
+       LB2_LINUX_TEST_RESULT([kstrtobool_from_user], [
+               AC_DEFINE(HAVE_KSTRTOBOOL_FROM_USER, 1,
+                       [kernel has kstrtobool_from_user])
+       ])
 ]) # LIBCFS_KSTRTOBOOL_FROM_USER
 
 #
 # Kernel version 4.5-rc1 commit d12481bc58fba89427565f8592e88446ec084a24
 # added crypto hash helpers
 #
-AC_DEFUN([LIBCFS_CRYPTO_HASH_HELPERS], [
-LB_CHECK_COMPILE([does crypto hash helper functions exist],
-crypto_hash_helpers, [
-       #include <crypto/hash.h>
-],[
-       crypto_ahash_alg_name(NULL);
-       crypto_ahash_driver_name(NULL);
-],[
-       AC_DEFINE(HAVE_CRYPTO_HASH_HELPERS, 1,
-               [crypto hash helper functions are available])
+AC_DEFUN([LIBCFS_SRC_CRYPTO_HASH_HELPERS], [
+       LB2_LINUX_TEST_SRC([crypto_hash_helpers], [
+               #include <crypto/hash.h>
+       ],[
+               crypto_ahash_alg_name(NULL);
+               crypto_ahash_driver_name(NULL);
+       ])
 ])
+AC_DEFUN([LIBCFS_CRYPTO_HASH_HELPERS], [
+       AC_MSG_CHECKING([does crypto hash helper functions exist])
+       LB2_LINUX_TEST_RESULT([crypto_hash_helpers], [
+               AC_DEFINE(HAVE_CRYPTO_HASH_HELPERS, 1,
+                       [crypto hash helper functions are available])
+       ])
 ]) # LIBCFS_CRYPTO_HASH_HELPERS
 
 #
 # Kernel version 4.5-rc1 commit 3502cad73c4bbf8f6365d539e814159275252c59
 # introduced rhashtable_replace_fast
 #
-AC_DEFUN([LIBCFS_RHASHTABLE_REPLACE], [
-LB_CHECK_COMPILE([if 'rhashtable_replace_fast' exists],
-rhashtable_replace_fast, [
-       #include <linux/rhashtable.h>
-],[
-       const struct rhashtable_params params = { 0 };
+AC_DEFUN([LIBCFS_SRC_RHASHTABLE_REPLACE], [
+       LB2_LINUX_TEST_SRC([rhashtable_replace_fast], [
+               #include <linux/rhashtable.h>
+       ],[
+               const struct rhashtable_params params = { 0 };
 
-       rhashtable_replace_fast(NULL, NULL, NULL, params);
-],[
-       AC_DEFINE(HAVE_RHASHTABLE_REPLACE, 1,
-               [rhashtable_replace_fast() is available])
+               rhashtable_replace_fast(NULL, NULL, NULL, params);
+       ])
 ])
+AC_DEFUN([LIBCFS_RHASHTABLE_REPLACE], [
+       AC_MSG_CHECKING([if 'rhashtable_replace_fast' exists])
+       LB2_LINUX_TEST_RESULT([rhashtable_replace_fast], [
+               AC_DEFINE(HAVE_RHASHTABLE_REPLACE, 1,
+                       [rhashtable_replace_fast() is available])
+       ])
 ]) # LIBCFS_RHASHTABLE_REPLACE
 
 #
@@ -572,15 +628,18 @@ LB_CHECK_EXPORT([kset_find_obj], [lib/kobject.c],
 # fixed the brokenness of hash_64(). The fix removed GOLDEN_RATIO_PRIME_64
 # since it was a poor prime value.
 #
-AC_DEFUN([LIBCFS_BROKEN_HASH_64], [
-LB_CHECK_COMPILE([kernel has fixed hash_64()],
-broken_hash_64, [
+AC_DEFUN([LIBCFS_SRC_BROKEN_HASH_64], [
+       LB2_LINUX_TEST_SRC([broken_hash_64], [
        #include <linux/hash.h>
-],[
-       int tmp = GOLDEN_RATIO_PRIME_64;
-],[
-       AC_DEFINE(HAVE_BROKEN_HASH_64, 1, [kernel hash_64() is broken])
+       ],[
+               int tmp = GOLDEN_RATIO_PRIME_64;
+       ])
 ])
+AC_DEFUN([LIBCFS_BROKEN_HASH_64], [
+       AC_MSG_CHECKING([kernel has fixed hash_64()])
+       LB2_LINUX_TEST_RESULT([broken_hash_64], [
+               AC_DEFINE(HAVE_BROKEN_HASH_64, 1, [kernel hash_64() is broken])
+       ])
 ]) # LIBCFS_BROKEN_HASH_64
 
 #
@@ -588,36 +647,42 @@ broken_hash_64, [
 #
 # linux 4.6 kernel changed stacktrace_ops address to return an int
 #
-AC_DEFUN([LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT], [
-LB_CHECK_COMPILE([if 'struct stacktrace_ops' address function returns an int],
-stacktrace_ops_address_return_int, [
-       #include <asm/stacktrace.h>
-],[
-       int rc;
+AC_DEFUN([LIBCFS_SRC_STACKTRACE_OPS_ADDRESS_RETURN_INT], [
+       LB2_LINUX_TEST_SRC([stacktrace_ops_address_return_int], [
+               #include <asm/stacktrace.h>
+       ],[
+               int rc;
 
-       rc = ((struct stacktrace_ops *)0)->address(NULL, 0, 0);
-],[
-       AC_DEFINE(STACKTRACE_OPS_ADDRESS_RETURN_INT, 1,
-               ['struct stacktrace_ops' address function returns an int])
+               rc = ((struct stacktrace_ops *)0)->address(NULL, 0, 0);
+       ])
 ])
+AC_DEFUN([LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT], [
+       AC_MSG_CHECKING([if 'struct stacktrace_ops' address function returns an int])
+       LB2_LINUX_TEST_RESULT([stacktrace_ops_address_return_int], [
+               AC_DEFINE(STACKTRACE_OPS_ADDRESS_RETURN_INT, 1,
+                       ['struct stacktrace_ops' address function returns an int])
+       ])
 ]) # LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT
 
 #
 # Kernel version 4.6 removed both struct task_struct and struct mm_struct
 # arguments to get_user_pages
 #
-AC_DEFUN([LIBCFS_GET_USER_PAGES_6ARG], [
-LB_CHECK_COMPILE([if 'get_user_pages()' takes 6 arguments],
-get_user_pages_6arg, [
-       #include <linux/mm.h>
-],[
-       int rc;
+AC_DEFUN([LIBCFS_SRC_GET_USER_PAGES_6ARG], [
+       LB2_LINUX_TEST_SRC([get_user_pages_6arg], [
+               #include <linux/mm.h>
+       ],[
+               int rc;
 
-       rc = get_user_pages(0, 0, 0, 0, NULL, NULL);
-],[
-       AC_DEFINE(HAVE_GET_USER_PAGES_6ARG, 1,
-               [get_user_pages takes 6 arguments])
+               rc = get_user_pages(0, 0, 0, 0, NULL, NULL);
+       ])
 ])
+AC_DEFUN([LIBCFS_GET_USER_PAGES_6ARG], [
+       AC_MSG_CHECKING([if 'get_user_pages()' takes 6 arguments])
+       LB2_LINUX_TEST_RESULT([get_user_pages_6arg], [
+               AC_DEFINE(HAVE_GET_USER_PAGES_6ARG, 1,
+                       [get_user_pages takes 6 arguments])
+       ])
 ]) # LIBCFS_GET_USER_PAGES_6ARG
 
 #
@@ -639,58 +704,65 @@ LB_CHECK_LINUX_HEADER([linux/stringhash.h], [
 # changed __rhashtable_insert_fast to support the new function
 # rhashtable_lookup_get_insert_key().
 #
-AC_DEFUN([LIBCFS_RHASHTABLE_INSERT_FAST], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if internal '__rhashtable_insert_fast()' returns int],
-rhashtable_insert_fast, [
-       #include <linux/rhashtable.h>
-],[
-       const struct rhashtable_params params = { 0 };
-       int rc;
+AC_DEFUN([LIBCFS_SRC_RHASHTABLE_INSERT_FAST], [
+       LB2_LINUX_TEST_SRC([rhashtable_insert_fast], [
+               #include <linux/rhashtable.h>
+       ],[
+               const struct rhashtable_params params = { 0 };
+               int rc;
 
-       rc = __rhashtable_insert_fast(NULL, NULL, NULL, params);
-],[
-       AC_DEFINE(HAVE_HASHTABLE_INSERT_FAST_RETURN_INT, 1,
-                 ['__rhashtable_insert_fast()' returns int])
+               rc = __rhashtable_insert_fast(NULL, NULL, NULL, params);
+       ],
+       [-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_RHASHTABLE_INSERT_FAST], [
+       AC_MSG_CHECKING([if internal '__rhashtable_insert_fast()' returns int])
+       LB2_LINUX_TEST_RESULT([rhashtable_insert_fast], [
+               AC_DEFINE(HAVE_HASHTABLE_INSERT_FAST_RETURN_INT, 1,
+                         ['__rhashtable_insert_fast()' returns int])
+       ])
 ]) # LIBCFS_RHASHTABLE_INSERT_FAST
 
 #
 # Kernel version 4.7-rc1 commit 8f6fd83c6c5ec66a4a70c728535ddcdfef4f3697
 # added 3rd arg to rhashtable_walk_init
 #
-AC_DEFUN([LIBCFS_RHASHTABLE_WALK_INIT_3ARG], [
-LB_CHECK_COMPILE([if 'rhashtable_walk_init' has 3 args],
-rhashtable_walk_init, [
-       #include <linux/gfp.h>
-       #include <linux/rhashtable.h>
-],[
-       rhashtable_walk_init(NULL, NULL, GFP_KERNEL);
-],[
-       AC_DEFINE(HAVE_3ARG_RHASHTABLE_WALK_INIT, 1,
-               [rhashtable_walk_init() has 3 args])
+AC_DEFUN([LIBCFS_SRC_RHASHTABLE_WALK_INIT_3ARG], [
+       LB2_LINUX_TEST_SRC([rhashtable_walk_init], [
+               #include <linux/gfp.h>
+               #include <linux/rhashtable.h>
+       ],[
+               rhashtable_walk_init(NULL, NULL, GFP_KERNEL);
+       ])
 ])
-]) # LIBCFS_RHASHTABLE_REPLACE
+AC_DEFUN([LIBCFS_RHASHTABLE_WALK_INIT_3ARG], [
+       AC_MSG_CHECKING([if 'rhashtable_walk_init' has 3 args])
+       LB2_LINUX_TEST_RESULT([rhashtable_walk_init], [
+               AC_DEFINE(HAVE_3ARG_RHASHTABLE_WALK_INIT, 1,
+                       [rhashtable_walk_init() has 3 args])
+       ])
+]) # LIBCFS_RHASHTABLE_WALK_INIT_3ARG
 
 #
 # Kernel version 4.8-rc6 commit ca26893f05e86497a86732768ec53cd38c0819ca
 # introduced rhashtable_lookup
 #
-AC_DEFUN([LIBCFS_RHASHTABLE_LOOKUP], [
-LB_CHECK_COMPILE([if 'rhashtable_lookup' exist],
-rhashtable_lookup, [
-       #include <linux/rhashtable.h>
-],[
-       const struct rhashtable_params params = { 0 };
-       void *ret;
+AC_DEFUN([LIBCFS_SRC_RHASHTABLE_LOOKUP], [
+       LB2_LINUX_TEST_SRC([rhashtable_lookup], [
+               #include <linux/rhashtable.h>
+       ],[
+               const struct rhashtable_params params = { 0 };
+               void *ret;
 
-       ret = rhashtable_lookup(NULL, NULL, params);
-],[
-       AC_DEFINE(HAVE_RHASHTABLE_LOOKUP, 1,
-               [rhashtable_lookup() is available])
+               ret = rhashtable_lookup(NULL, NULL, params);
+       ])
 ])
+AC_DEFUN([LIBCFS_RHASHTABLE_LOOKUP], [
+       AC_MSG_CHECKING([if 'rhashtable_lookup' exist])
+       LB2_LINUX_TEST_RESULT([rhashtable_lookup], [
+               AC_DEFINE(HAVE_RHASHTABLE_LOOKUP, 1,
+                       [rhashtable_lookup() is available])
+       ])
 ]) # LIBCFS_RHASHTABLE_LOOKUP
 
 #
@@ -699,18 +771,20 @@ rhashtable_lookup, [
 # created the rhlist interface to allow inserting duplicate objects
 # into the same table.
 #
-AC_DEFUN([LIBCFS_RHLTABLE], [
-LB_CHECK_COMPILE([does 'struct rhltable' exist],
-rhtable, [
-       #include <linux/rhashtable.h>
-],[
-       struct rhltable *hlt = NULL;
+AC_DEFUN([LIBCFS_SRC_RHLTABLE], [
+       LB2_LINUX_TEST_SRC([rhtable], [
+               #include <linux/rhashtable.h>
+       ],[
+               struct rhltable *hlt = NULL;
 
-       rhltable_destroy(hlt);
-],[
-       AC_DEFINE(HAVE_RHLTABLE, 1,
-                 [struct rhltable exist])
+               rhltable_destroy(hlt);
+       ])
 ])
+AC_DEFUN([LIBCFS_RHLTABLE], [
+       AC_MSG_CHECKING([does 'struct rhltable' exist])
+       LB2_LINUX_TEST_RESULT([rhtable], [
+               AC_DEFINE(HAVE_RHLTABLE, 1, [struct rhltable exist])
+       ])
 ]) # LIBCFS_RHLTABLE
 
 #
@@ -719,68 +793,82 @@ rhtable, [
 # Kernel version 4.8 commit c8fe4609827aedc9c4b45de80e7cdc8ccfa8541b
 # removed both struct stacktrace_ops and dump_trace() function
 #
-AC_DEFUN([LIBCFS_STACKTRACE_OPS], [
-LB_CHECK_COMPILE([if 'struct stacktrace_ops' exists],
-stacktrace_ops, [
-       struct task_struct;
-       struct pt_regs;
-       #include <asm/stacktrace.h>
-],[
-       struct stacktrace_ops ops;
-       ops.stack = NULL;
-],[
-       AC_DEFINE(HAVE_STACKTRACE_OPS, 1,
-               [struct stacktrace_ops exists])
+AC_DEFUN([LIBCFS_SRC_STACKTRACE_OPS], [
+       LB2_LINUX_TEST_SRC([stacktrace_ops], [
+               struct task_struct;
+               struct pt_regs;
+               #include <asm/stacktrace.h>
+       ],[
+               struct stacktrace_ops ops;
+               ops.stack = NULL;
+       ])
 ])
+AC_DEFUN([LIBCFS_STACKTRACE_OPS], [
+AC_MSG_CHECKING([if 'struct stacktrace_ops' exists])
+       LB2_LINUX_TEST_RESULT([stacktrace_ops], [
+               AC_DEFINE(HAVE_STACKTRACE_OPS, 1,
+                       [struct stacktrace_ops exists])
+       ])
 ]) # LIBCFS_STACKTRACE_OPS
 
 #
+# LIBCFS_RHASHTABLE_WALK_ENTER
+#
 # Kernel version 4.9-rc1 commit 246779dd090bd1b74d2652b3a6ca7759f593b27a
 # introduced rhashtable_walk_enter
 #
-AC_DEFUN([LIBCFS_RHASHTABLE_WALK_ENTER], [
-LB_CHECK_COMPILE([if 'rhashtable_walk_enter' exists],
-rhashtable_walk_enter, [
-       #include <linux/rhashtable.h>
-],[
-       rhashtable_walk_enter(NULL, NULL);
-],[
-       AC_DEFINE(HAVE_RHASHTABLE_WALK_ENTER, 1,
-               [rhashtable_walk_enter() is available])
+AC_DEFUN([LIBCFS_SRC_RHASHTABLE_WALK_ENTER], [
+       LB2_LINUX_TEST_SRC([rhashtable_walk_enter], [
+               #include <linux/rhashtable.h>
+       ],[
+               rhashtable_walk_enter(NULL, NULL);
+       ])
 ])
-]) # LIBCFS_RHASHTABLE_REPLACE
+AC_DEFUN([LIBCFS_RHASHTABLE_WALK_ENTER], [
+       AC_MSG_CHECKING([if 'rhashtable_walk_enter' exists])
+       LB2_LINUX_TEST_RESULT([rhashtable_walk_enter], [
+               AC_DEFINE(HAVE_RHASHTABLE_WALK_ENTER, 1,
+                       [rhashtable_walk_enter() is available])
+       ])
+]) # LIBCFS_RHASHTABLE_WALK_ENTER
 
 #
 # Kernel version 4.9 commit 768ae309a96103ed02eb1e111e838c87854d8b51
 # mm: replace get_user_pages() write/force parameters with gup_flags
 #
-AC_DEFUN([LIBCFS_GET_USER_PAGES_GUP_FLAGS], [
-LB_CHECK_COMPILE([if 'get_user_pages()' takes gup_flags in arguments],
-get_user_pages_gup_flags, [
-       #include <linux/mm.h>
-],[
-       int rc;
-       rc = get_user_pages(0, 0, FOLL_WRITE, NULL, NULL);
-],[
-       AC_DEFINE(HAVE_GET_USER_PAGES_GUP_FLAGS, 1,
-               [get_user_pages takes gup_flags in arguments])
+AC_DEFUN([LIBCFS_SRC_GET_USER_PAGES_GUP_FLAGS], [
+       LB2_LINUX_TEST_SRC([get_user_pages_gup_flags], [
+               #include <linux/mm.h>
+       ],[
+               int rc;
+               rc = get_user_pages(0, 0, FOLL_WRITE, NULL, NULL);
+       ])
 ])
+AC_DEFUN([LIBCFS_GET_USER_PAGES_GUP_FLAGS], [
+       AC_MSG_CHECKING([if 'get_user_pages()' takes gup_flags in arguments])
+       LB2_LINUX_TEST_RESULT([get_user_pages_gup_flags], [
+               AC_DEFINE(HAVE_GET_USER_PAGES_GUP_FLAGS, 1,
+                       [get_user_pages takes gup_flags in arguments])
+               ])
 ]) # LIBCFS_GET_USER_PAGES_GUP_FLAGS
 
 #
 # Kernel version 4.10 commit 7b737965b33188bd3dbb44e938535c4006d97fbb
 # libcfs: Convert to hotplug state machine
 #
-AC_DEFUN([LIBCFS_HOTPLUG_STATE_MACHINE], [
-LB_CHECK_COMPILE([if libcfs supports CPU hotplug state machine],
-cpu_hotplug_state_machine, [
-       #include <linux/cpuhotplug.h>
-],[
-       cpuhp_remove_state(CPUHP_LUSTRE_CFS_DEAD);
-],[
-       AC_DEFINE(HAVE_HOTPLUG_STATE_MACHINE, 1,
-               [hotplug state machine is supported])
+AC_DEFUN([LIBCFS_SRC_HOTPLUG_STATE_MACHINE], [
+       LB2_LINUX_TEST_SRC([cpu_hotplug_state_machine], [
+               #include <linux/cpuhotplug.h>
+       ],[
+               cpuhp_remove_state(CPUHP_LUSTRE_CFS_DEAD);
+       ])
 ])
+AC_DEFUN([LIBCFS_HOTPLUG_STATE_MACHINE], [
+       AC_MSG_CHECKING([if libcfs supports CPU hotplug state machine])
+       LB2_LINUX_TEST_RESULT([cpu_hotplug_state_machine], [
+               AC_DEFINE(HAVE_HOTPLUG_STATE_MACHINE, 1,
+                       [hotplug state machine is supported])
+       ])
 ]) # LIBCFS_HOTPLUG_STATE_MACHINE
 
 #
@@ -801,17 +889,20 @@ EXTRA_KCFLAGS="$tmp_flags"
 # Kernel version 4.12 commit 499118e966f1d2150bd66647c8932343c4e9a0b8
 # introduce memalloc_noreclaim_{save,restore}
 #
-AC_DEFUN([LIBCFS_MEMALLOC_NORECLAIM], [
-LB_CHECK_COMPILE([if memalloc_noreclaim_{save,restore} exist],
-memalloc_noreclaim, [
-       #include <linux/sched/mm.h>
-],[
-       int flag = memalloc_noreclaim_save();
-       memalloc_noreclaim_restore(flag);
-],[
-       AC_DEFINE(HAVE_MEMALLOC_RECLAIM, 1,
-               [memalloc_noreclaim_{save,restore}() is supported])
+AC_DEFUN([LIBCFS_SRC_MEMALLOC_NORECLAIM], [
+       LB2_LINUX_TEST_SRC([memalloc_noreclaim], [
+               #include <linux/sched/mm.h>
+       ],[
+               int flag = memalloc_noreclaim_save();
+               memalloc_noreclaim_restore(flag);
+       ])
 ])
+AC_DEFUN([LIBCFS_MEMALLOC_NORECLAIM], [
+       AC_MSG_CHECKING([if memalloc_noreclaim_{save,restore} exist])
+       LB2_LINUX_TEST_RESULT([memalloc_noreclaim], [
+               AC_DEFINE(HAVE_MEMALLOC_RECLAIM, 1,
+                       [memalloc_noreclaim_{save,restore}() is supported])
+       ])
 ]) # LIBCFS_MEMALLOC_NORECLAIM
 
 #
@@ -829,85 +920,98 @@ LB_CHECK_LINUX_HEADER([linux/sched/signal.h], [
 # Kernel version 4.11-rc1 commit 2c935bc57221cc2edc787c72ea0e2d30cdcd3d5e
 # introduce kref_read
 #
-AC_DEFUN([LIBCFS_KREF_READ], [
-LB_CHECK_COMPILE([if 'kref_read' exists],
-kref_read, [
-       #include <linux/kref.h>
-],[
-       kref_read(NULL);
-],[
-       AC_DEFINE(HAVE_KREF_READ, 1,
-               [kref_read() is available])
+AC_DEFUN([LIBCFS_SRC_KREF_READ], [
+       LB2_LINUX_TEST_SRC([kref_read], [
+               #include <linux/kref.h>
+       ],[
+               kref_read(NULL);
+       ])
 ])
-]) LIBCFS_KREF_READ
+AC_DEFUN([LIBCFS_KREF_READ], [
+       AC_MSG_CHECKING([if 'kref_read' exists])
+       LB2_LINUX_TEST_RESULT([kref_read], [
+               AC_DEFINE(HAVE_KREF_READ, 1, [kref_read() is available])
+       ])
+]) # LIBCFS_KREF_READ
 
 #
 # Kernel version 4.11-rc1 commit da20420f83ea0fbcf3d03afda08d971ea1d8a356
 # introduced rht_bucket_var
 #
-AC_DEFUN([LIBCFS_RHT_BUCKET_VAR], [
-LB_CHECK_COMPILE([if 'rht_bucket_var' exists],
-rht_bucket_var, [
-       #include <linux/rhashtable.h>
-],[
-
-       rht_bucket_var(NULL, 0);
-],[
-       AC_DEFINE(HAVE_RHT_BUCKET_VAR, 1,
-               [rht_bucket_var() is available])
+AC_DEFUN([LIBCFS_SRC_RHT_BUCKET_VAR], [
+       LB2_LINUX_TEST_SRC([rht_bucket_var], [
+               #include <linux/rhashtable.h>
+       ],[
+               rht_bucket_var(NULL, 0);
+       ])
 ])
+AC_DEFUN([LIBCFS_RHT_BUCKET_VAR], [
+       AC_MSG_CHECKING([if 'rht_bucket_var' exists])
+       LB2_LINUX_TEST_RESULT([rht_bucket_var], [
+               AC_DEFINE(HAVE_RHT_BUCKET_VAR, 1,
+                       [rht_bucket_var() is available])
+       ])
 ]) # LIBCFS_RHT_BUCKET_VAR
 
 #
 # Kernel version 4.11 commit f9fe1c12d126f9887441fa5bb165046f30ddd4b5
 # introduced rhashtable_lookup_get_insert_fast
 #
-AC_DEFUN([LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST], [
-LB_CHECK_COMPILE([if 'rhashtable_lookup_get_insert_fast' exist],
-rhashtable_lookup_get_insert_fast, [
-       #include <linux/rhashtable.h>
-],[
-       const struct rhashtable_params params = { 0 };
-       void *ret;
+AC_DEFUN([LIBCFS_SRC_RHASHTABLE_LOOKUP_GET_INSERT_FAST], [
+       LB2_LINUX_TEST_SRC([rhashtable_lookup_get_insert_fast], [
+               #include <linux/rhashtable.h>
+       ],[
+               const struct rhashtable_params params = { 0 };
+               void *ret;
 
-       ret = rhashtable_lookup_get_insert_fast(NULL, NULL, params);
-],[
-       AC_DEFINE(HAVE_RHASHTABLE_LOOKUP_GET_INSERT_FAST, 1,
-               [rhashtable_lookup_get_insert_fast() is available])
+               ret = rhashtable_lookup_get_insert_fast(NULL, NULL, params);
+       ])
 ])
+AC_DEFUN([LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST], [
+       AC_MSG_CHECKING([if 'rhashtable_lookup_get_insert_fast' exist])
+       LB2_LINUX_TEST_RESULT([rhashtable_lookup_get_insert_fast], [
+               AC_DEFINE(HAVE_RHASHTABLE_LOOKUP_GET_INSERT_FAST, 1,
+                       [rhashtable_lookup_get_insert_fast() is available])
+       ])
 ]) # LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST
 
 #
 # Kernel version 4.12-rc2 8f553c498e1772cccb39a114da4a498d22992758
 # provide proper CPU hotplug locking
 #
-AC_DEFUN([LIBCFS_CPUS_READ_LOCK], [
-LB_CHECK_COMPILE([if 'cpus_read_[un]lock' exist],
-cpu_read_lock, [
-       #include <linux/cpu.h>
-],[
-       cpus_read_lock();
-       cpus_read_unlock();
-],[
-       AC_DEFINE(HAVE_CPUS_READ_LOCK, 1, ['cpus_read_lock' exist])
+AC_DEFUN([LIBCFS_SRC_CPUS_READ_LOCK], [
+       LB2_LINUX_TEST_SRC([cpu_read_lock], [
+               #include <linux/cpu.h>
+       ],[
+               cpus_read_lock();
+               cpus_read_unlock();
+       ])
 ])
+AC_DEFUN([LIBCFS_CPUS_READ_LOCK], [
+       AC_MSG_CHECKING([if 'cpus_read_[un]lock' exist])
+       LB2_LINUX_TEST_RESULT([cpu_read_lock], [
+               AC_DEFINE(HAVE_CPUS_READ_LOCK, 1, ['cpus_read_lock' exist])
+       ])
 ]) # LIBCFS_CPUS_READ_LOCK
 
 #
 # Kernel version 4.12-rc3 f9727a17db9bab71ddae91f74f11a8a2f9a0ece6
 # renamed uuid_be to uuid_t
 #
-AC_DEFUN([LIBCFS_UUID_T], [
-LB_CHECK_COMPILE([if 'uuid_t' exist],
-uuid_t, [
-       #include <linux/uuid.h>
-],[
-       uuid_t uuid;
+AC_DEFUN([LIBCFS_SRC_UUID_T], [
+       LB2_LINUX_TEST_SRC([uuid_t], [
+               #include <linux/uuid.h>
+       ],[
+               uuid_t uuid;
 
-       memset(uuid.b, 0, 16);
-],[
-       AC_DEFINE(HAVE_UUID_T, 1, ['uuid_t' exist])
+               memset(uuid.b, 0, 16);
+       ])
 ])
+AC_DEFUN([LIBCFS_UUID_T], [
+       AC_MSG_CHECKING([if 'uuid_t' exist])
+       LB2_LINUX_TEST_RESULT([uuid_t], [
+               AC_DEFINE(HAVE_UUID_T, 1, ['uuid_t' exist])
+       ])
 ]) # LIBCFS_UUID_T
 
 #
@@ -940,18 +1044,21 @@ LB_CHECK_LINUX_HEADER([linux/wait_bit.h], [
 #      struct wait_queue_head::task_list       => ::head
 #      struct wait_queue_entry::task_list      => ::entry
 #
-AC_DEFUN([LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME], [
-LB_CHECK_COMPILE([if linux wait_queue_head list_head is named head],
-wait_queue_task_list, [
-       #include <linux/wait.h>
-],[
-       wait_queue_head_t e;
+AC_DEFUN([LIBCFS_SRC_WAIT_QUEUE_TASK_LIST_RENAME], [
+       LB2_LINUX_TEST_SRC([wait_queue_task_list], [
+               #include <linux/wait.h>
+       ],[
+               wait_queue_head_t e;
 
-       INIT_LIST_HEAD(&e.head);
-],[
-       AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY_LIST, 1,
-               [linux wait_queue_head_t list_head is name head])
+               INIT_LIST_HEAD(&e.head);
+       ])
 ])
+AC_DEFUN([LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME], [
+       AC_MSG_CHECKING([if linux wait_queue_head list_head is named head])
+       LB2_LINUX_TEST_RESULT([wait_queue_task_list], [
+               AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY_LIST, 1,
+                       [linux wait_queue_head_t list_head is name head])
+       ])
 ]) # LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME
 
 #
@@ -960,18 +1067,21 @@ wait_queue_task_list, [
 # Kernel version 4.13 ac6424b981bce1c4bc55675c6ce11bfe1bbfa64f
 # Rename wait_queue_t => wait_queue_entry_t
 #
-AC_DEFUN([LIBCFS_WAIT_QUEUE_ENTRY], [
-LB_CHECK_COMPILE([if 'wait_queue_entry_t' exists],
-wait_queue_entry, [
-       #include <linux/wait.h>
-],[
-       wait_queue_entry_t e;
+AC_DEFUN([LIBCFS_SRC_WAIT_QUEUE_ENTRY], [
+       LB2_LINUX_TEST_SRC([wait_queue_entry], [
+               #include <linux/wait.h>
+       ],[
+               wait_queue_entry_t e;
 
-       e.flags = 0;
-],[
-       AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY, 1,
-               ['wait_queue_entry_t' is available])
+               e.flags = 0;
+       ])
 ])
+AC_DEFUN([LIBCFS_WAIT_QUEUE_ENTRY], [
+       AC_MSG_CHECKING([if 'wait_queue_entry_t' exists])
+       LB2_LINUX_TEST_RESULT([wait_queue_entry], [
+               AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY, 1,
+                       ['wait_queue_entry_t' is available])
+       ])
 ]) # LIBCFS_WAIT_QUEUE_ENTRY
 
 #
@@ -981,21 +1091,21 @@ wait_queue_entry, [
 # changed kernel_write prototype to make is plug compatible
 # with the unexported vfs_write()
 #
-AC_DEFUN([LIBCFS_NEW_KERNEL_WRITE], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'kernel_write' matches other read/write helpers],
-kernel_write_match, [
-       #include <linux/fs.h>
-],[
-       const void *buf = NULL;
-       loff_t pos = 0;
-       return kernel_write(NULL, buf, 0, &pos);
-],[
-       AC_DEFINE(HAVE_NEW_KERNEL_WRITE, 1,
-               ['kernel_write' aligns with read/write helpers])
+AC_DEFUN([LIBCFS_SRC_NEW_KERNEL_WRITE], [
+       LB2_LINUX_TEST_SRC([kernel_write_match], [
+               #include <linux/fs.h>
+       ],[
+               const void *buf = NULL;
+               loff_t pos = 0;
+               return kernel_write(NULL, buf, 0, &pos);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_NEW_KERNEL_WRITE], [
+       AC_MSG_CHECKING([if 'kernel_write' matches other read/write helpers])
+       LB2_LINUX_TEST_RESULT([kernel_write_match], [
+               AC_DEFINE(HAVE_NEW_KERNEL_WRITE, 1,
+                       ['kernel_write' aligns with read/write helpers])
+       ])
 ]) # LIBCFS_NEW_KERNEL_WRITE
 
 #
@@ -1004,19 +1114,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # kernel 5.0 commit ca79b0c211af63fa3276f0e3fd7dd9ada2439839
 # mm: convert totalram_pages and totalhigh_pages variables to atomic
 #
-AC_DEFUN([LIBCFS_MM_TOTALRAM_PAGES_FUNC], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if totalram_pages is a function],
-totalram_pages, [
-       #include <linux/mm.h>
-],[
-       totalram_pages_inc();
-],[
-       AC_DEFINE(HAVE_TOTALRAM_PAGES_AS_FUNC, 1,
-               [if totalram_pages is a function])
+AC_DEFUN([LIBCFS_SRC_MM_TOTALRAM_PAGES_FUNC], [
+       LB2_LINUX_TEST_SRC([totalram_pages], [
+               #include <linux/mm.h>
+       ],[
+               totalram_pages_inc();
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_MM_TOTALRAM_PAGES_FUNC], [
+       AC_MSG_CHECKING([if totalram_pages is a function])
+       LB2_LINUX_TEST_RESULT([totalram_pages], [
+               AC_DEFINE(HAVE_TOTALRAM_PAGES_AS_FUNC, 1,
+                       [if totalram_pages is a function])
+       ])
 ]) # LIBCFS_MM_TOTALRAM_PAGES_FUNC
 
 #
@@ -1026,20 +1136,20 @@ EXTRA_KCFLAGS="$tmp_flags"
 # the signature of kernel_read to match other read/write helpers
 # and place offset last.
 #
-AC_DEFUN([LIBCFS_NEW_KERNEL_READ], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'kernel_read()' has loff_t *pos as last parameter],
-kernel_read, [
-       #include <linux/fs.h>
+AC_DEFUN([LIBCFS_SRC_NEW_KERNEL_READ], [
+       LB2_LINUX_TEST_SRC([kernel_read], [
+               #include <linux/fs.h>
        ],[
-       loff_t pos = 0;
-       kernel_read(NULL, NULL, 0, &pos);
-],[
-       AC_DEFINE(HAVE_KERNEL_READ_LAST_POSP, 1,
-               [kernel_read() signature ends with loff_t *pos])
+               loff_t pos = 0;
+               kernel_read(NULL, NULL, 0, &pos);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_NEW_KERNEL_READ], [
+       AC_MSG_CHECKING([if 'kernel_read()' has loff_t *pos as last parameter])
+       LB2_LINUX_TEST_RESULT([kernel_read], [
+               AC_DEFINE(HAVE_KERNEL_READ_LAST_POSP, 1,
+                       [kernel_read() signature ends with loff_t *pos])
+       ])
 ]) # LIBCFS_NEW_KERNEL_READ
 
 #
@@ -1049,16 +1159,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # remove expires and data arguments from DEFINE_TIMER. Also the callback
 # when from using unsigned long argument to using struct timer_list pointer.
 #
-AC_DEFUN([LIBCFS_DEFINE_TIMER], [
-LB_CHECK_COMPILE([if DEFINE_TIMER takes only 2 arguments],
-define_timer, [
-       #include <linux/timer.h>
-],[
-       static DEFINE_TIMER(my_timer, NULL);
-],[
-       AC_DEFINE(HAVE_NEW_DEFINE_TIMER, 1,
-               [DEFINE_TIMER uses only 2 arguements])
+AC_DEFUN([LIBCFS_SRC_DEFINE_TIMER], [
+       LB2_LINUX_TEST_SRC([define_timer], [
+               #include <linux/timer.h>
+       ],[
+               static DEFINE_TIMER(my_timer, NULL);
+       ])
 ])
+AC_DEFUN([LIBCFS_DEFINE_TIMER], [
+       AC_MSG_CHECKING([if DEFINE_TIMER takes only 2 arguments])
+       LB2_LINUX_TEST_RESULT([define_timer], [
+               AC_DEFINE(HAVE_NEW_DEFINE_TIMER, 1,
+                       [DEFINE_TIMER uses only 2 arguements])
+       ])
 ]) # LIBCFS_DEFINE_TIMER
 
 #
@@ -1085,23 +1198,23 @@ LB_CHECK_EXPORT([save_stack_trace_tsk], [arch/$SUBARCH/kernel/stacktrace.c],
 # Kernel v4.15-rc8-106-g08f36ff64234
 # lockdep: Make lockdep checking constant
 #
-AC_DEFUN([LIBCFS_LOCKDEP_IS_HELD], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'lockdep_is_held()' uses const argument],
-lockdep_is_held, [
-       #include <linux/lockdep.h>
-],[
-#ifdef CONFIG_LOCKDEP
-       const struct spinlock *lock = NULL;
+AC_DEFUN([LIBCFS_SRC_LOCKDEP_IS_HELD], [
+       LB2_LINUX_TEST_SRC([lockdep_is_held], [
+               #include <linux/lockdep.h>
+       ],[
+       #ifdef CONFIG_LOCKDEP
+               const struct spinlock *lock = NULL;
 
-       lockdep_is_held(lock);
-#endif
-],[],[
-       AC_DEFINE(NEED_LOCKDEP_IS_HELD_DISCARD_CONST, 1,
-               [lockdep_is_held() argument is const])
+               lockdep_is_held(lock);
+       #endif
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_LOCKDEP_IS_HELD], [
+       AC_MSG_CHECKING([if 'lockdep_is_held()' uses const argument])
+       LB2_LINUX_TEST_RESULT([lockdep_is_held], [],[
+               AC_DEFINE(NEED_LOCKDEP_IS_HELD_DISCARD_CONST, 1,
+                       [lockdep_is_held() argument is const])
+       ])
 ]) # LIBCFS_LOCKDEP_IS_HELD
 
 #
@@ -1111,37 +1224,48 @@ EXTRA_KCFLAGS="$tmp_flags"
 # setup_timer() was replaced by timer_setup(), where the callback
 # argument is the structure already holding the struct timer_list.
 #
-AC_DEFUN([LIBCFS_TIMER_SETUP], [
-LB_CHECK_COMPILE([if setup_timer has been replaced with timer_setup],
-timer_setup, [
-       #include <linux/timer.h>
-],[
-       timer_setup(NULL, NULL, 0);
-],[
-       AC_DEFINE(HAVE_TIMER_SETUP, 1,
-               [timer_setup has replaced setup_timer])
+AC_DEFUN([LIBCFS_SRC_TIMER_SETUP], [
+       LB2_LINUX_TEST_SRC([timer_setup], [
+               #include <linux/timer.h>
+       ],[
+               timer_setup(NULL, NULL, 0);
+       ])
 ])
+AC_DEFUN([LIBCFS_TIMER_SETUP], [
+       AC_MSG_CHECKING([if setup_timer has been replaced with timer_setup])
+       LB2_LINUX_TEST_RESULT([timer_setup], [
+               AC_DEFINE(HAVE_TIMER_SETUP, 1,
+                       [timer_setup has replaced setup_timer])
+       ])
 ]) # LIBCFS_TIMER_SETUP
 
 #
 # LIBCFS_WAIT_VAR_EVENT
 #
-# Kernel version 4.16-rc4 commit 6b2bb7265f0b62605e8caee3613449ed0db270b9
-# added wait_var_event()
-#
-AC_DEFUN([LIBCFS_WAIT_VAR_EVENT], [
-LB_CHECK_COMPILE([if 'wait_var_event' exist],
-wait_var_event, [
-       #ifdef HAVE_WAIT_BIT_HEADER_H
-       #include <linux/wait_bit.h>
-       #endif
-       #include <linux/wait.h>
-],[
-       wake_up_var(NULL);
-],[
-       AC_DEFINE(HAVE_WAIT_VAR_EVENT, 1,
-               ['wait_var_event' is available])
+# Kernel version 4.16-rc4 commit 6b2bb7265f0b62605e8caee3613449ed0db270b9
+# added wait_var_event()
+#
+AC_DEFUN([LIBCFS_SRC_WAIT_VAR_EVENT], [
+       if test "x$lb_cv_header_linux_wait_bit_h" = xyes; then
+               WAIT_BIT_H="-DHAVE_WAIT_BIT_HEADER_H=1"
+       else
+               WAIT_BIT_H=""
+       fi
+       LB2_LINUX_TEST_SRC([wait_var_event], [
+               #ifdef HAVE_WAIT_BIT_HEADER_H
+               #include <linux/wait_bit.h>
+               #endif
+               #include <linux/wait.h>
+       ],[
+               wake_up_var(NULL);
+       ],[${WAIT_BIT_H}])
 ])
+AC_DEFUN([LIBCFS_WAIT_VAR_EVENT], [
+       AC_MSG_CHECKING([if 'wait_var_event' exist])
+       LB2_LINUX_TEST_RESULT([wait_var_event], [
+               AC_DEFINE(HAVE_WAIT_VAR_EVENT, 1,
+                       ['wait_var_event' is available])
+       ])
 ]) # LIBCFS_WAIT_VAR_EVENT
 
 #
@@ -1150,16 +1274,20 @@ wait_var_event, [
 # Kernel version 4.17 commit c42b65e363ce97a828f81b59033c3558f8fa7f70
 # added bitmap memory allocation handling.
 #
-AC_DEFUN([LIBCFS_BITMAP_ALLOC], [
-LB_CHECK_COMPILE([if Linux bitmap memory management exist],
-bitmap_alloc, [
-       #include <linux/bitmap.h>
-],[
-       unsigned long *map = bitmap_alloc(1, GFP_KERNEL);
-],[
-       AC_DEFINE(HAVE_BITMAP_ALLOC, 1,
-               [Linux bitmap can be allocated])
+AC_DEFUN([LIBCFS_SRC_BITMAP_ALLOC], [
+       LB2_LINUX_TEST_SRC([bitmap_alloc], [
+               #include <linux/bitmap.h>
+       ],[
+               unsigned long *map = bitmap_alloc(1, GFP_KERNEL);
+               (void)map;
+       ])
 ])
+AC_DEFUN([LIBCFS_BITMAP_ALLOC], [
+       AC_MSG_CHECKING([if Linux bitmap memory management exist])
+       LB2_LINUX_TEST_RESULT([bitmap_alloc], [
+               AC_DEFINE(HAVE_BITMAP_ALLOC, 1,
+                       [Linux bitmap can be allocated])
+       ])
 ]) # LIBCFS_BITMAP_ALLOC
 
 #
@@ -1168,19 +1296,27 @@ bitmap_alloc, [
 # Kernel version 4.17-rc2 commit 8236b0ae31c837d2b3a2565c5f8d77f637e824cc
 # added clear_and_wake_up_bit()
 #
-AC_DEFUN([LIBCFS_CLEAR_AND_WAKE_UP_BIT], [
-LB_CHECK_COMPILE([if 'clear_and_wake_up_bit' exist],
-clear_and_wake_up_bit, [
-       #ifdef HAVE_WAIT_BIT_HEADER_H
-       #include <linux/wait_bit.h>
-       #endif
-       #include <linux/wait.h>
-],[
-       clear_and_wake_up_bit(0, NULL);
-],[
-       AC_DEFINE(HAVE_CLEAR_AND_WAKE_UP_BIT, 1,
-               ['clear_and_wake_up_bit' is available])
+AC_DEFUN([LIBCFS_SRC_CLEAR_AND_WAKE_UP_BIT], [
+       if test "x$lb_cv_header_linux_wait_bit_h" = xyes; then
+               WAIT_BIT_H="-DHAVE_WAIT_BIT_HEADER_H=1"
+       else
+               WAIT_BIT_H=""
+       fi
+       LB2_LINUX_TEST_SRC([clear_and_wake_up_bit], [
+               #ifdef HAVE_WAIT_BIT_HEADER_H
+               #include <linux/wait_bit.h>
+               #endif
+               #include <linux/wait.h>
+       ],[
+               clear_and_wake_up_bit(0, NULL);
+       ],[${WAIT_BIT_H}])
 ])
+AC_DEFUN([LIBCFS_CLEAR_AND_WAKE_UP_BIT], [
+       AC_MSG_CHECKING([if 'clear_and_wake_up_bit' exist])
+       LB2_LINUX_TEST_RESULT([clear_and_wake_up_bit], [
+               AC_DEFINE(HAVE_CLEAR_AND_WAKE_UP_BIT, 1,
+                       ['clear_and_wake_up_bit' is available])
+       ])
 ]) # LIBCFS_CLEAR_AND_WAKE_UP_BIT
 
 #
@@ -1188,19 +1324,19 @@ clear_and_wake_up_bit, [
 #
 # kernel 4.18.0-293.el8
 # tcp_sock_set_nodelay() was added
-AC_DEFUN([LIBCFS_TCP_SOCK_SET_NODELAY], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'tcp_sock_set_nodelay()' exists],
-tcp_sock_set_nodelay_exists, [
-       #include <linux/tcp.h>
-],[
-       tcp_sock_set_nodelay(NULL);
-],[
-       AC_DEFINE(HAVE_TCP_SOCK_SET_NODELAY, 1,
-               ['tcp_sock_set_nodelay()' exists])
+AC_DEFUN([LIBCFS_SRC_TCP_SOCK_SET_NODELAY], [
+       LB2_LINUX_TEST_SRC([tcp_sock_set_nodelay_exists], [
+               #include <linux/tcp.h>
+       ],[
+               tcp_sock_set_nodelay(NULL);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_TCP_SOCK_SET_NODELAY], [
+       AC_MSG_CHECKING([if 'tcp_sock_set_nodelay()' exists])
+       LB2_LINUX_TEST_RESULT([tcp_sock_set_nodelay_exists], [
+               AC_DEFINE(HAVE_TCP_SOCK_SET_NODELAY, 1,
+                       ['tcp_sock_set_nodelay()' exists])
+       ])
 ]) # LIBCFS_TCP_SOCK_SET_NODELAY
 
 #
@@ -1208,19 +1344,20 @@ EXTRA_KCFLAGS="$tmp_flags"
 #
 # kernel 4.18.0-293.el8
 # tcp_sock_set_keepidle() was added
-AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPIDLE], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'tcp_sock_set_keepidle()' exists],
-tcp_sock_set_keepidle_exists, [
-       #include <linux/tcp.h>
-],[
-       tcp_sock_set_keepidle(NULL, 0);
-],[
-       AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPIDLE, 1,
-               ['tcp_sock_set_keepidle()' exists])
+#
+AC_DEFUN([LIBCFS_SRC_TCP_SOCK_SET_KEEPIDLE], [
+       LB2_LINUX_TEST_SRC([tcp_sock_set_keepidle_exists], [
+               #include <linux/tcp.h>
+       ],[
+               tcp_sock_set_keepidle(NULL, 0);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPIDLE], [
+       AC_MSG_CHECKING([if 'tcp_sock_set_keepidle()' exists])
+       LB2_LINUX_TEST_RESULT([tcp_sock_set_keepidle_exists], [
+               AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPIDLE, 1,
+                       ['tcp_sock_set_keepidle()' exists])
+       ])
 ]) # LIBCFS_TCP_SOCK_SET_KEEPIDLE
 
 #
@@ -1228,19 +1365,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # kernel v5.7-rc6-2504-gddd061b8daed
 #   tcp: add tcp_sock_set_quickack
 #
-AC_DEFUN([LIBCFS_TCP_SOCK_SET_QUICKACK], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'tcp_sock_set_quickack()' exists],
-tcp_sock_set_quickack_exists, [
-       #include <linux/tcp.h>
-],[
-       tcp_sock_set_quickack(NULL, 0);
-],[
-       AC_DEFINE(HAVE_TCP_SOCK_SET_QUICKACK, 1,
-               ['tcp_sock_set_quickack()' exists])
+AC_DEFUN([LIBCFS_SRC_TCP_SOCK_SET_QUICKACK], [
+       LB2_LINUX_TEST_SRC([tcp_sock_set_quickack_exists], [
+               #include <linux/tcp.h>
+       ],[
+               tcp_sock_set_quickack(NULL, 0);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_TCP_SOCK_SET_QUICKACK], [
+       AC_MSG_CHECKING([if 'tcp_sock_set_quickack()' exists])
+       LB2_LINUX_TEST_RESULT([tcp_sock_set_quickack_exists], [
+               AC_DEFINE(HAVE_TCP_SOCK_SET_QUICKACK, 1,
+                       ['tcp_sock_set_quickack()' exists])
+       ])
 ]) # LIBCFS_TCP_SOCK_SET_QUICKACK
 
 #
@@ -1248,19 +1385,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # v5.7-rc6-2508-gd41ecaac903c
 # tcp: add tcp_sock_set_keepintvl
 #
-AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPINTVL], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'tcp_sock_set_keepintvl()' exists],
-tcp_sock_set_keepintvl_exists, [
-       #include <linux/tcp.h>
-],[
-       tcp_sock_set_keepintvl(NULL, 0);
-],[
-       AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPINTVL, 1,
-               ['tcp_sock_set_keepintvl()' exists])
+AC_DEFUN([LIBCFS_SRC_TCP_SOCK_SET_KEEPINTVL], [
+       LB2_LINUX_TEST_SRC([tcp_sock_set_keepintvl_exists], [
+               #include <linux/tcp.h>
+       ],[
+               tcp_sock_set_keepintvl(NULL, 0);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPINTVL], [
+       AC_MSG_CHECKING([if 'tcp_sock_set_keepintvl()' exists])
+       LB2_LINUX_TEST_RESULT([tcp_sock_set_keepintvl_exists], [
+               AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPINTVL, 1,
+                       ['tcp_sock_set_keepintvl()' exists])
+       ])
 ]) # LIBCFS_TCP_SOCK_SET_KEEPINTVL
 
 #
@@ -1268,19 +1405,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # v5.7-rc6-2509-g480aeb9639d6
 # tcp: add tcp_sock_set_keepcnt
 #
-AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPCNT], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if 'tcp_sock_set_keepcnt()' exists],
-tcp_sock_set_keepcnt_exists, [
-       #include <linux/tcp.h>
-],[
-       tcp_sock_set_keepcnt(NULL, 0);
-],[
-       AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPCNT, 1,
-               ['tcp_sock_set_keepcnt()' exists])
+AC_DEFUN([LIBCFS_SRC_TCP_SOCK_SET_KEEPCNT], [
+       LB2_LINUX_TEST_SRC([tcp_sock_set_keepcnt_exists], [
+               #include <linux/tcp.h>
+       ],[
+               tcp_sock_set_keepcnt(NULL, 0);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPCNT], [
+       AC_MSG_CHECKING([if 'tcp_sock_set_keepcnt()' exists])
+       LB2_LINUX_TEST_RESULT([tcp_sock_set_keepcnt_exists], [
+               AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPCNT, 1,
+                       ['tcp_sock_set_keepcnt()' exists])
+       ])
 ]) # LIBCFS_TCP_SOCK_SET_KEEPCNT
 
 #
@@ -1290,19 +1427,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # replaced the radix tree implementation with Xarrays. This change
 # introduced functionaly needed for general Xarray support
 #
-AC_DEFUN([LIBCFS_XARRAY_SUPPORT], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if page cache uses Xarray],
-xarray_support, [
-       #include <linux/xarray.h>
-],[
-       xa_is_value(NULL);
-],[
-       AC_DEFINE(HAVE_XARRAY_SUPPORT, 1,
-               [kernel Xarray implementation lacks 'xa_is_value'])
+AC_DEFUN([LIBCFS_SRC_XARRAY_SUPPORT], [
+       LB2_LINUX_TEST_SRC([xarray_support], [
+               #include <linux/xarray.h>
+       ],[
+               xa_is_value(NULL);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_XARRAY_SUPPORT], [
+       AC_MSG_CHECKING([if page cache uses Xarray])
+       LB2_LINUX_TEST_RESULT([xarray_support], [
+               AC_DEFINE(HAVE_XARRAY_SUPPORT, 1,
+                       [kernel Xarray implementation lacks 'xa_is_value'])
+       ])
 ]) # LIBCFS_XARRAY_SUPPORT
 
 #
@@ -1311,21 +1448,21 @@ EXTRA_KCFLAGS="$tmp_flags"
 # kernel 4.20 commit 00e23707442a75b404392cef1405ab4fd498de6b
 # iov_iter: Use accessor functions to access an iterator's type and direction.
 #
-AC_DEFUN([LIBCFS_HAVE_IOV_ITER_TYPE], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if iov_iter_type exists],
-macro_iov_iter_type_exists, [
-       #include <linux/uio.h>
-],[
-       struct iov_iter iter = { };
-       enum iter_type type = iov_iter_type(&iter);
-       (void)type;
-],[
-       AC_DEFINE(HAVE_IOV_ITER_TYPE, 1,
-               [if iov_iter_type exists])
+AC_DEFUN([LIBCFS_SRC_HAVE_IOV_ITER_TYPE], [
+       LB2_LINUX_TEST_SRC([macro_iov_iter_type_exists], [
+               #include <linux/uio.h>
+       ],[
+               struct iov_iter iter = { };
+               enum iter_type type = iov_iter_type(&iter);
+               (void)type;
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_HAVE_IOV_ITER_TYPE], [
+       AC_MSG_CHECKING([if iov_iter_type exists])
+       LB2_LINUX_TEST_RESULT([macro_iov_iter_type_exists], [
+               AC_DEFINE(HAVE_IOV_ITER_TYPE, 1,
+                       [if iov_iter_type exists])
+       ])
 ]) # LIBCFS_HAVE_IOV_ITER_TYPE
 
 #
@@ -1337,25 +1474,25 @@ EXTRA_KCFLAGS="$tmp_flags"
 # Added <keys/request_key_auth-type.h> and get_request_key_auth()
 # which was propagated to stable
 #
-AC_DEFUN([LIBCFS_GET_REQUEST_KEY_AUTH], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if get_request_key_auth() is available],
-get_request_key_auth_exported, [
-       #include <linux/key.h>
-       #include <linux/keyctl.h>
-       #include <keys/request_key_auth-type.h>
-],[
-       struct key *ring;
-       const struct key *key = NULL;
-       struct request_key_auth *rka = get_request_key_auth(key);
+AC_DEFUN([LIBCFS_SRC_GET_REQUEST_KEY_AUTH], [
+       LB2_LINUX_TEST_SRC([get_request_key_auth_exported], [
+               #include <linux/key.h>
+               #include <linux/keyctl.h>
+               #include <keys/request_key_auth-type.h>
+       ],[
+               struct key *ring;
+               const struct key *key = NULL;
+               struct request_key_auth *rka = get_request_key_auth(key);
 
-       ring = key_get(rka->dest_keyring);
-],[
-       AC_DEFINE(HAVE_GET_REQUEST_KEY_AUTH, 1,
-               [get_request_key_auth() is available])
+               ring = key_get(rka->dest_keyring);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_GET_REQUEST_KEY_AUTH], [
+       AC_MSG_CHECKING([if get_request_key_auth() is available])
+       LB2_LINUX_TEST_RESULT([get_request_key_auth_exported], [
+               AC_DEFINE(HAVE_GET_REQUEST_KEY_AUTH, 1,
+                       [get_request_key_auth() is available])
+       ])
 ]) # LIBCFS_GET_REQUEST_KEY_AUTH
 
 #
@@ -1366,15 +1503,18 @@ EXTRA_KCFLAGS="$tmp_flags"
 # Linux commit v5.18-rc1-2-gcdb4f26a63c3
 #    kobject: kobj_type: remove default_attrs
 #
-AC_DEFUN([LIBCFS_KOBJ_TYPE_DEFAULT_GROUPS],[
-LB_CHECK_COMPILE([does struct kobj_type have 'default_groups' member],
-kobj_type_default_groups, [
+AC_DEFUN([LIBCFS_SRC_KOBJ_TYPE_DEFAULT_GROUPS],[
+       LB2_LINUX_TEST_SRC([kobj_type_default_groups], [
                #include <linux/kobject.h>
        ],[
                struct kobj_type *kobj_type = NULL;
                void *has = kobj_type->default_groups;
                (void) has;
-       ],[
+       ])
+])
+AC_DEFUN([LIBCFS_KOBJ_TYPE_DEFAULT_GROUPS],[
+       AC_MSG_CHECKING([does struct kobj_type have 'default_groups' member])
+       LB2_LINUX_TEST_RESULT([kobj_type_default_groups], [
                AC_DEFINE(HAVE_KOBJ_TYPE_DEFAULT_GROUPS, 1,
                        [struct kobj_type has 'default_groups' member])
        ])
@@ -1386,20 +1526,20 @@ kobj_type_default_groups, [
 # kernel 5.3 commit 3cf5d076fb4d48979f382bc9452765bf8b79e740
 # signal: Remove task parameter from force_sig
 #
-AC_DEFUN([LIBCFS_LOOKUP_USER_KEY], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if lookup_user_key() is available],
-lookup_user_key_exported, [
-       #include <linux/key.h>
-       #include <linux/keyctl.h>
-],[
-       lookup_user_key(KEY_SPEC_USER_KEYRING, 0, 0);
-],[
-       AC_DEFINE(HAVE_LOOKUP_USER_KEY, 1,
-               [lookup_user_key() is available])
+AC_DEFUN([LIBCFS_SRC_LOOKUP_USER_KEY], [
+       LB2_LINUX_TEST_SRC([lookup_user_key_exported], [
+               #include <linux/key.h>
+               #include <linux/keyctl.h>
+       ],[
+               lookup_user_key(KEY_SPEC_USER_KEYRING, 0, 0);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_LOOKUP_USER_KEY], [
+       AC_MSG_CHECKING([if lookup_user_key() is available])
+       LB2_LINUX_TEST_RESULT([lookup_user_key_exported], [
+               AC_DEFINE(HAVE_LOOKUP_USER_KEY, 1,
+                       [lookup_user_key() is available])
+       ])
 ]) # LIBCFS_LOOKUP_USER_KEY
 
 #
@@ -1408,19 +1548,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # kernel 5.3 commit 3cf5d076fb4d48979f382bc9452765bf8b79e740
 # signal: Remove task parameter from force_sig
 #
-AC_DEFUN([LIBCFS_FORCE_SIG_WITH_TASK], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if force_sig has task parameter],
-force_sig_with_task, [
-       #include <linux/sched/signal.h>
-],[
-       force_sig(SIGINT, NULL);
-],[
-       AC_DEFINE(HAVE_FORCE_SIG_WITH_TASK, 1,
-               [force_sig() has task parameter])
+AC_DEFUN([LIBCFS_SRC_FORCE_SIG_WITH_TASK], [
+       LB2_LINUX_TEST_SRC([force_sig_with_task], [
+               #include <linux/sched/signal.h>
+       ],[
+               force_sig(SIGINT, NULL);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_FORCE_SIG_WITH_TASK], [
+       AC_MSG_CHECKING([if force_sig has task parameter])
+       LB2_LINUX_TEST_RESULT([force_sig_with_task], [
+               AC_DEFINE(HAVE_FORCE_SIG_WITH_TASK, 1,
+                       [force_sig() has task parameter])
+       ])
 ]) # LIBCFS_FORCE_SIG_WITH_TASK
 
 #
@@ -1429,21 +1569,21 @@ EXTRA_KCFLAGS="$tmp_flags"
 # kernel v5.3-rc2-1-g64a38e840ce5
 # SUNRPC: Track writers of the 'channel' file to improve cache_listeners_exist
 #
-AC_DEFUN([LIBCFS_CACHE_DETAIL_WRITERS], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if struct cache_detail has writers],
-cache_detail_writers_atomic, [
-       #include <linux/sunrpc/cache.h>
+AC_DEFUN([LIBCFS_SRC_CACHE_DETAIL_WRITERS], [
+       LB2_LINUX_TEST_SRC([cache_detail_writers_atomic], [
+               #include <linux/sunrpc/cache.h>
 
-       static struct cache_detail rsi_cache;
-],[
-       atomic_set(&rsi_cache.writers, 0);
-],[
-       AC_DEFINE(HAVE_CACHE_DETAIL_WRITERS, 1,
-               [struct cache_detail has writers])
+               static struct cache_detail rsi_cache;
+       ],[
+               atomic_set(&rsi_cache.writers, 0);
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_CACHE_DETAIL_WRITERS], [
+       AC_MSG_CHECKING([if struct cache_detail has writers])
+       LB2_LINUX_TEST_RESULT([cache_detail_writers_atomic], [
+               AC_DEFINE(HAVE_CACHE_DETAIL_WRITERS, 1,
+                       [struct cache_detail has writers])
+       ])
 ]) # LIBCFS_CACHE_DETAIL_WRITERS
 
 #
@@ -1462,16 +1602,19 @@ LB_CHECK_EXPORT([kallsyms_lookup_name], [kernel/kallsyms.c],
 #
 # kernel v5.8-rc1~201^2~19
 # mm: remove the pgprot argument to __vmalloc
-AC_DEFUN([LIBCFS_VMALLOC_2ARGS], [
-LB_CHECK_COMPILE([if __vmalloc has 2 args],
-vmalloc_2args, [
-       #include <linux/vmalloc.h>
-],[
-       __vmalloc(0, 0);
-],[
-       AC_DEFINE(HAVE_VMALLOC_2ARGS, 1,
-               [__vmalloc only takes 2 args.])
+AC_DEFUN([LIBCFS_SRC_VMALLOC_2ARGS], [
+       LB2_LINUX_TEST_SRC([vmalloc_2args], [
+               #include <linux/vmalloc.h>
+       ],[
+               __vmalloc(0, 0);
+       ],[])
 ])
+AC_DEFUN([LIBCFS_VMALLOC_2ARGS], [
+       AC_MSG_CHECKING([if __vmalloc has 2 args])
+       LB2_LINUX_TEST_RESULT([vmalloc_2args], [
+               AC_DEFINE(HAVE_VMALLOC_2ARGS, 1,
+                       [__vmalloc only takes 2 args.])
+       ])
 ]) # LIBCFS_VMALLOC_2ARGS
 
 #
@@ -1494,9 +1637,6 @@ AC_DEFUN([LIBCFS_HAVE_PROC_OPS], [
        LB2_LINUX_TEST_RESULT([proc_ops], [
                AC_DEFINE(HAVE_PROC_OPS, 1,
                        [struct proc_ops exists])
-               AC_MSG_RESULT(yes)
-       ],[
-               AC_MSG_RESULT(no)
        ])
 ]) # LIBCFS_HAVE_PROC_OPS
 
@@ -1506,21 +1646,21 @@ AC_DEFUN([LIBCFS_HAVE_PROC_OPS], [
 # kernel v5.8-rc1~201^2~75
 # mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead
 #
-AC_DEFUN([LIBCFS_HAVE_NR_UNSTABLE_NFS], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if NR_UNSTABLE_NFS still in use],
-nr_unstable_nfs_exists, [
-       #include <linux/mm.h>
+AC_DEFUN([LIBCFS_SRC_HAVE_NR_UNSTABLE_NFS], [
+       LB2_LINUX_TEST_SRC([nr_unstable_nfs_exists], [
+               #include <linux/mm.h>
 
-       int i;
-],[
-       i = NR_UNSTABLE_NFS;
-],[
-       AC_DEFINE(HAVE_NR_UNSTABLE_NFS, 1,
-               [NR_UNSTABLE_NFS is still in use.])
+               int i;
+       ],[
+               i = NR_UNSTABLE_NFS;
+       ],[-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_HAVE_NR_UNSTABLE_NFS], [
+       AC_MSG_CHECKING([if NR_UNSTABLE_NFS still in use])
+       LB2_LINUX_TEST_RESULT([nr_unstable_nfs_exists], [
+               AC_DEFINE(HAVE_NR_UNSTABLE_NFS, 1,
+                       [NR_UNSTABLE_NFS is still in use.])
+       ])
 ]) # LIBCFS_HAVE_NR_UNSTABLE_NFS
 
 #
@@ -1529,16 +1669,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 # kernel v5.8-rc1~83^2~24
 # mmap locking API: rename mmap_sem to mmap_lock
 #
-AC_DEFUN([LIBCFS_HAVE_MMAP_LOCK], [
-LB_CHECK_COMPILE([if mmap_lock API is available],
-mmap_write_lock, [
-       #include <linux/mm.h>
-],[
-       mmap_write_lock(NULL);
-],[
-       AC_DEFINE(HAVE_MMAP_LOCK, 1,
-               [mmap_lock API is available.])
+AC_DEFUN([LIBCFS_SRC_HAVE_MMAP_LOCK], [
+       LB2_LINUX_TEST_SRC([mmap_write_lock], [
+               #include <linux/mm.h>
+       ],[
+               mmap_write_lock(NULL);
+       ],[])
 ])
+AC_DEFUN([LIBCFS_HAVE_MMAP_LOCK], [
+       AC_MSG_CHECKING([if mmap_lock API is available])
+       LB2_LINUX_TEST_RESULT([mmap_write_lock], [
+               AC_DEFINE(HAVE_MMAP_LOCK, 1,
+                       [mmap_lock API is available.])
+       ])
 ]) # LIBCFS_HAVE_MMAP_LOCK
 
 #
@@ -1546,19 +1689,19 @@ mmap_write_lock, [
 #
 # kernel v5.8-rc1~165^2~59^2
 # net: remove kernel_setsockopt
+AC_DEFUN([LIBCFS_SRC_KERNEL_SETSOCKOPT], [
+       LB2_LINUX_TEST_SRC([kernel_setsockopt_exists], [
+               #include <linux/net.h>
+       ],[
+               kernel_setsockopt(NULL, 0, 0, NULL, 0);
+       ],[-Werror])
+])
 AC_DEFUN([LIBCFS_KERNEL_SETSOCKOPT], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if kernel_setsockopt still in use],
-kernel_setsockopt_exists, [
-       #include <linux/net.h>
-],[
-       kernel_setsockopt(NULL, 0, 0, NULL, 0);
-],[
+       AC_MSG_CHECKING([if kernel_setsockopt still in use])
+       LB2_LINUX_TEST_RESULT([kernel_setsockopt_exists], [
        AC_DEFINE(HAVE_KERNEL_SETSOCKOPT, 1,
                [kernel_setsockopt still in use])
-])
-EXTRA_KCFLAGS="$tmp_flags"
+       ])
 ]) # LIBCFS_KERNEL_SETSOCKOPT
 
 #
@@ -1566,16 +1709,19 @@ EXTRA_KCFLAGS="$tmp_flags"
 #
 # kernel linux-hwe-5.8 (5.8.0-22.23~20.04.1)
 # LSM: Use lsmcontext in security_release_secctx
-AC_DEFUN([LIBCFS_SEC_RELEASE_SECCTX], [
-LB_CHECK_COMPILE([if security_release_secctx has 1 arg],
-security_release_secctx_1arg, [
-       #include <linux/security.h>
-],[
-       security_release_secctx(NULL);
-],[
-       AC_DEFINE(HAVE_SEC_RELEASE_SECCTX_1ARG, 1,
-               [security_release_secctx has 1 arg.])
+AC_DEFUN([LIBCFS_SRC_SEC_RELEASE_SECCTX], [
+       LB2_LINUX_TEST_SRC([security_release_secctx_1arg], [
+               #include <linux/security.h>
+       ],[
+               security_release_secctx(NULL);
+       ],[])
 ])
+AC_DEFUN([LIBCFS_SEC_RELEASE_SECCTX], [
+       AC_MSG_CHECKING([if security_release_secctx has 1 arg])
+       LB2_LINUX_TEST_RESULT([security_release_secctx_1arg], [
+               AC_DEFINE(HAVE_SEC_RELEASE_SECCTX_1ARG, 1,
+                       [security_release_secctx has 1 arg.])
+       ])
 ]) # LIBCFS_SEC_RELEASE_SECCTX
 
 #
@@ -1584,19 +1730,20 @@ security_release_secctx_1arg, [
 # kernel v5.10-rc1~3
 # mm: remove kzfree() compatibility definition
 #
-AC_DEFUN([LIBCFS_HAVE_KFREE_SENSITIVE], [
-LB_CHECK_COMPILE([if kfree_sensitive() is available],
-kfree_sensitive_exists, [
-       #include <linux/slab.h>
-
-],[
-       kfree_sensitive(NULL);
-],[
-       AC_DEFINE(HAVE_KFREE_SENSITIVE, 1,
-               [kfree_sensitive() is available.])
+AC_DEFUN([LIBCFS_SRC_HAVE_KFREE_SENSITIVE], [
+       LB2_LINUX_TEST_SRC([kfree_sensitive_exists], [
+               #include <linux/slab.h>
+       ],[
+               kfree_sensitive(NULL);
+       ], [-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
-]) # LIBCFS_HAVE_NR_UNSTABLE_NFS
+AC_DEFUN([LIBCFS_HAVE_KFREE_SENSITIVE], [
+       AC_MSG_CHECKING([if kfree_sensitive() is available])
+       LB2_LINUX_TEST_RESULT([kfree_sensitive_exists], [
+               AC_DEFINE(HAVE_KFREE_SENSITIVE, 1,
+                       [kfree_sensitive() is available.])
+       ])
+]) # LIBCFS_HAVE_KFREE_SENSITIVE
 
 #
 # LIBCFS_HAVE_CRYPTO_SHA2_HEADER
@@ -1615,19 +1762,20 @@ LB_CHECK_LINUX_HEADER([crypto/sha2.h], [
 #
 # kernel 5.10.70 commit 4f0f586bf0c898233d8f316f471a21db2abd522d
 # treewide: Change list_sort to use const pointers
-AC_DEFUN([LIBCFS_HAVE_LIST_CMP_FUNC_T], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror -Wno-unused-variable"
-LB_CHECK_COMPILE([if list_cmp_func_t type is defined],
-list_cmp_func_t, [
-       #include <linux/list_sort.h>
-],[
-       list_cmp_func_t cmp;
-],[
-       AC_DEFINE(HAVE_LIST_CMP_FUNC_T, 1,
-               [list_cmp_func_t type is defined])
+AC_DEFUN([LIBCFS_SRC_HAVE_LIST_CMP_FUNC_T], [
+       LB2_LINUX_TEST_SRC([list_cmp_func_t_exists], [
+               #include <linux/list_sort.h>
+       ],[
+               list_cmp_func_t cmp;
+               (void)cmp;
+       ], [-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_HAVE_LIST_CMP_FUNC_T], [
+       AC_MSG_CHECKING([if list_cmp_func_t type is defined])
+       LB2_LINUX_TEST_RESULT([list_cmp_func_t_exists], [
+               AC_DEFINE(HAVE_LIST_CMP_FUNC_T, 1,
+                       [list_cmp_func_t type is defined])
+       ])
 ]) # LIBCFS_HAVE_LIST_CMP_FUNC_T
 
 #
@@ -1678,23 +1826,46 @@ EXTRA_KCFLAGS="$tmp_flags"
 # Kernel 5.13-rc6 commit b03fbd4ff24c5f075e58eb19261d5f8b3e40d
 # introduced task_is_running() macro.
 #
-AC_DEFUN([LIBCFS_HAVE_TASK_IS_RUNNING], [
-tmp_flags="$EXTRA_KCFLAGS"
-EXTRA_KCFLAGS="-Werror"
-LB_CHECK_COMPILE([if task_is_running() is defined],
-task_is_running, [
-       #include <linux/sched.h>
-],[
-       if (task_is_running(current))
-               schedule();
-],[
-       AC_DEFINE(HAVE_TASK_IS_RUNNING, 1,
-               [task_is_running() is defined])
+AC_DEFUN([LIBCFS_SRC_HAVE_TASK_IS_RUNNING], [
+       LB2_LINUX_TEST_SRC([task_is_running], [
+               #include <linux/sched.h>
+       ],[
+               if (task_is_running(current))
+                       schedule();
+       ], [-Werror])
 ])
-EXTRA_KCFLAGS="$tmp_flags"
+AC_DEFUN([LIBCFS_HAVE_TASK_IS_RUNNING], [
+       AC_MSG_CHECKING([if task_is_running() is defined])
+       LB2_LINUX_TEST_RESULT([task_is_running], [
+               AC_DEFINE(HAVE_TASK_IS_RUNNING, 1,
+                       [task_is_running() is defined])
+       ])
 ]) # LIBCFS_HAVE_TASK_IS_RUNNING
 
 #
+# LIBCFS_IOV_ITER_HAS_ITER_TYPE
+#
+# kernel 5.13 commit 8cd54c1c848031a87820e58d772166ffdf8c08c0 change
+# ->type to ->iter_type
+#
+AC_DEFUN([LIBCFS_SRC_IOV_ITER_HAS_ITER_TYPE], [
+       LB2_LINUX_TEST_SRC([iov_iter_has_iter_type_member], [
+               #include <linux/uio.h>
+       ],[
+               struct iov_iter iter = { .iter_type = ITER_KVEC };
+               (void)iter;
+       ],
+       [-Werror])
+])
+AC_DEFUN([LIBCFS_IOV_ITER_HAS_ITER_TYPE], [
+       AC_MSG_CHECKING([if iov_iter has member type])
+       LB2_LINUX_TEST_RESULT([iov_iter_has_iter_type_member], [
+               AC_DEFINE(HAVE_IOV_ITER_HAS_ITER_TYPE_MEMBER, 1,
+                       [if iov_iter has member iter_type])
+       ])
+]) # LIBCFS_IOV_ITER_HAS_ITER_TYPE
+
+#
 # LIBCFS_LINUX_STDARG_HEADER
 #
 # Kernel 5.14-rc5 commit c0891ac15f0428ffa81b2e818d416bdf3cb74ab6
@@ -1731,35 +1902,21 @@ EXTRA_KCFLAGS="$tmp_flags"
 # Kernel 5.15-rc1 commit 2a14c9ae15a38148484a128b84bff7e9ffd90d68
 # moved param_set_uint_minmax to common code
 #
-AC_DEFUN([LIBCFS_PARAM_SET_UINT_MINMAX],[
-LB_CHECK_COMPILE([does function 'param_set_uint_minmax' exist],
-param_set_uint_minmax, [
-       #include <linux/moduleparam.h>
-],[
-       param_set_uint_minmax(NULL, NULL, 0, 0);
-],[
-       AC_DEFINE(HAVE_PARAM_SET_UINT_MINMAX, 1,
-               ['param_set_uint_minmax' is available])
+AC_DEFUN([LIBCFS_SRC_PARAM_SET_UINT_MINMAX],[
+       LB2_LINUX_TEST_SRC([param_set_uint_minmax], [
+               #include <linux/moduleparam.h>
+       ],[
+               param_set_uint_minmax(NULL, NULL, 0, 0);
+       ], [])
 ])
+AC_DEFUN([LIBCFS_PARAM_SET_UINT_MINMAX],[
+       AC_MSG_CHECKING([does function 'param_set_uint_minmax' exist])
+       LB2_LINUX_TEST_RESULT([param_set_uint_minmax], [
+               AC_DEFINE(HAVE_PARAM_SET_UINT_MINMAX, 1,
+                       ['param_set_uint_minmax' is available])
+       ])
 ]) # LIBCFS_PARAM_SET_UINT_MINMAX
 
-AC_DEFUN([LIBCFS_PROG_LINUX_SRC], [
-       # 5.6
-       LIBCFS_SRC_HAVE_PROC_OPS
-       # 5.10
-       LIBCFS_SRC_NLA_STRSCPY
-
-       AC_MSG_CHECKING([for available kernel interfaces to libcfs])
-       LB2_LINUX_TEST_COMPILE_ALL([libcfs])
-       AC_MSG_RESULT([done])
-])
-AC_DEFUN([LIBCFS_PROG_LINUX_RESULTS], [
-       # 5.6
-       LIBCFS_HAVE_PROC_OPS
-       # 5.10
-       LIBCFS_NLA_STRSCPY
-])
-
 #
 # LIBCFS_LINUX_BLK_INTEGRITY_HEADER
 #
@@ -1784,15 +1941,18 @@ EXTRA_KCFLAGS="$tmp_flags"
 # Linux commit v5.16-11574-g359745d78351
 #    remove PDE_DATA()
 #
-AC_DEFUN([LIBCFS_PDE_DATA_EXISTS],[
-LB_CHECK_COMPILE([does function 'pde_data' exist],
-pde_data, [
+AC_DEFUN([LIBCFS_SRC_PDE_DATA_EXISTS],[
+       LB2_LINUX_TEST_SRC([pde_data], [
                #include <linux/proc_fs.h>
        ],[
                struct inode *inode = NULL;
                void *data =pde_data(inode);
                (void)data;
-       ],[
+       ],[])
+])
+AC_DEFUN([LIBCFS_PDE_DATA_EXISTS],[
+       AC_MSG_CHECKING([does function 'pde_data' exist])
+       LB2_LINUX_TEST_RESULT([pde_data], [
                AC_DEFINE(HAVE_pde_data, 1, [function pde_data() available])
        ],[
                AC_DEFINE(pde_data(inode), PDE_DATA(inode),
@@ -1800,6 +1960,252 @@ pde_data, [
        ])
 ]) # LIBCFS_PDE_DATA_EXISTS
 
+dnl #
+dnl # Generate and compile all of the kernel API test cases to determine
+dnl # which interfaces are available.  By invoking the kernel build system
+dnl # only once the compilation can be done in parallel significantly
+dnl # speeding up the process.
+dnl #
+AC_DEFUN([LIBCFS_PROG_LINUX_SRC], [
+       # 3.11
+       LIBCFS_SRC_KTIME_GET_TS64
+       # 3.12
+       LIBCFS_SRC_PREPARE_TO_WAIT_EVENT
+       LIBCFS_SRC_KERNEL_PARAM_OPS
+       LIBCFS_SRC_KTIME_ADD
+       LIBCFS_SRC_KTIME_AFTER
+       LIBCFS_SRC_KTIME_BEFORE
+       LIBCFS_SRC_KTIME_COMPARE
+       LIBCFS_SRC_SHRINKER_COUNT
+       # 3.15
+       LIBCFS_SRC_IOV_ITER_HAS_TYPE
+       # 3.17
+       LIBCFS_SRC_HLIST_ADD_AFTER
+       LIBCFS_SRC_TIMESPEC64
+       LIBCFS_SRC_KTIME_GET_NS
+       LIBCFS_SRC_KTIME_GET_REAL_TS64
+       LIBCFS_SRC_KTIME_GET_REAL_SECONDS
+       LIBCFS_SRC_KTIME_GET_REAL_NS
+       LIBCFS_SRC_KTIME_TO_TIMESPEC64
+       LIBCFS_SRC_TIMESPEC64_SUB
+       LIBCFS_SRC_TIMESPEC64_TO_KTIME
+       # 3.19
+       LIBCFS_SRC_KTIME_GET_SECONDS
+       # 4.0
+       LIBCFS_SRC_KTIME_MS_DELTA
+       # 4.2
+       LIBCFS_SRC_KERNEL_PARAM_LOCK
+       # 4.2
+       LIBCFS_SRC_HAVE_TOPOLOGY_SIBLING_CPUMASK
+       # 4.4
+       LIBCFS_SRC_KSTRTOBOOL_FROM_USER
+       # 4.5
+       LIBCFS_SRC_CRYPTO_HASH_HELPERS
+       LIBCFS_SRC_RHASHTABLE_REPLACE
+       # 4.6
+       LIBCFS_SRC_BROKEN_HASH_64
+       LIBCFS_SRC_STACKTRACE_OPS_ADDRESS_RETURN_INT
+       LIBCFS_SRC_GET_USER_PAGES_6ARG
+       # 4.7
+       LIBCFS_SRC_RHASHTABLE_INSERT_FAST
+       LIBCFS_SRC_RHASHTABLE_WALK_INIT_3ARG
+       # 4.8
+       LIBCFS_SRC_RHASHTABLE_LOOKUP
+       LIBCFS_SRC_RHLTABLE
+       LIBCFS_SRC_STACKTRACE_OPS
+       # 4.9
+       LIBCFS_SRC_GET_USER_PAGES_GUP_FLAGS
+       LIBCFS_SRC_RHASHTABLE_WALK_ENTER
+       # 4.10
+       LIBCFS_SRC_HOTPLUG_STATE_MACHINE
+       # 4.11
+       LIBCFS_SRC_RHASHTABLE_LOOKUP_GET_INSERT_FAST
+       LIBCFS_SRC_KREF_READ
+       LIBCFS_SRC_RHT_BUCKET_VAR
+       # 4.12
+       LIBCFS_SRC_CPUS_READ_LOCK
+       LIBCFS_SRC_UUID_T
+       LIBCFS_SRC_WAIT_QUEUE_TASK_LIST_RENAME
+       LIBCFS_SRC_MEMALLOC_NORECLAIM
+       # 4.13
+       LIBCFS_SRC_WAIT_QUEUE_ENTRY
+       # 4.14
+       LIBCFS_SRC_DEFINE_TIMER
+       LIBCFS_SRC_NEW_KERNEL_WRITE
+       LIBCFS_SRC_NEW_KERNEL_READ
+       # 4.15
+       LIBCFS_SRC_LOCKDEP_IS_HELD
+       LIBCFS_SRC_TIMER_SETUP
+       # 4.16
+       LIBCFS_SRC_HAVE_NS_TO_TIMESPEC64
+       LIBCFS_SRC_WAIT_VAR_EVENT
+       # 4.17
+       LIBCFS_SRC_BITMAP_ALLOC
+       LIBCFS_SRC_CLEAR_AND_WAKE_UP_BIT
+       # 4.18
+       LIBCFS_SRC_TCP_SOCK_SET_NODELAY
+       LIBCFS_SRC_TCP_SOCK_SET_KEEPIDLE
+       # 4.19
+       LIBCFS_SRC_XARRAY_SUPPORT
+       # 4.20
+       LIBCFS_SRC_HAVE_IOV_ITER_TYPE
+       # 5.0
+       LIBCFS_SRC_MM_TOTALRAM_PAGES_FUNC
+       LIBCFS_SRC_GET_REQUEST_KEY_AUTH
+       # 5.2
+       LIBCFS_SRC_KOBJ_TYPE_DEFAULT_GROUPS
+       # 5.3
+       LIBCFS_SRC_LOOKUP_USER_KEY
+       LIBCFS_SRC_FORCE_SIG_WITH_TASK
+       LIBCFS_SRC_CACHE_DETAIL_WRITERS
+       # 5.6
+       LIBCFS_SRC_HAVE_PROC_OPS
+       # 5.7
+       LIBCFS_SRC_TCP_SOCK_SET_QUICKACK
+       LIBCFS_SRC_TCP_SOCK_SET_KEEPINTVL
+       LIBCFS_SRC_TCP_SOCK_SET_KEEPCNT
+       # 5.8
+       LIBCFS_SRC_HAVE_NR_UNSTABLE_NFS
+       LIBCFS_SRC_HAVE_MMAP_LOCK
+       LIBCFS_SRC_KERNEL_SETSOCKOPT
+       LIBCFS_SRC_VMALLOC_2ARGS
+       # 5.10
+       LIBCFS_SRC_SEC_RELEASE_SECCTX
+       LIBCFS_SRC_HAVE_KFREE_SENSITIVE
+       LIBCFS_SRC_HAVE_LIST_CMP_FUNC_T
+       LIBCFS_SRC_NLA_STRSCPY
+       # 5.13
+       LIBCFS_SRC_HAVE_TASK_IS_RUNNING
+       LIBCFS_SRC_IOV_ITER_HAS_ITER_TYPE
+       # 5.15
+       LIBCFS_SRC_PARAM_SET_UINT_MINMAX
+       # 5.17
+       LIBCFS_SRC_PDE_DATA_EXISTS
+
+       LB2_LINUX_TEST_COMPILE_ALL([libcfs],
+               [for available kernel interfaces to libcfs])
+])
+
+dnl #
+dnl # Check results of kernel interface tests.
+dnl #
+AC_DEFUN([LIBCFS_PROG_LINUX_RESULTS], [
+       # 3.11
+       LIBCFS_KTIME_GET_TS64
+       # 3.12
+       LIBCFS_PREPARE_TO_WAIT_EVENT
+       LIBCFS_KERNEL_PARAM_OPS
+       LIBCFS_KTIME_ADD
+       LIBCFS_KTIME_AFTER
+       LIBCFS_KTIME_BEFORE
+       LIBCFS_KTIME_COMPARE
+       LIBCFS_SHRINKER_COUNT
+       # 3.15
+       LIBCFS_IOV_ITER_HAS_TYPE
+       # 3.17
+       LIBCFS_HLIST_ADD_AFTER
+       LIBCFS_TIMESPEC64
+       LIBCFS_KTIME_GET_NS
+       LIBCFS_KTIME_GET_REAL_TS64
+       LIBCFS_KTIME_GET_REAL_SECONDS
+       LIBCFS_KTIME_GET_REAL_NS
+       LIBCFS_KTIME_TO_TIMESPEC64
+       LIBCFS_TIMESPEC64_SUB
+       LIBCFS_TIMESPEC64_TO_KTIME
+       # 3.19
+       LIBCFS_KTIME_GET_SECONDS
+       # 4.0
+       LIBCFS_KTIME_MS_DELTA
+       # 4.1
+       LIBCFS_KERNEL_PARAM_LOCK
+       # 4.2
+       LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK
+       # 4.4
+       LIBCFS_KSTRTOBOOL_FROM_USER
+       # 4.5
+       LIBCFS_CRYPTO_HASH_HELPERS
+       LIBCFS_RHASHTABLE_REPLACE
+       # 4.6
+       LIBCFS_BROKEN_HASH_64
+       LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT
+       LIBCFS_GET_USER_PAGES_6ARG
+       # 4.7
+       LIBCFS_RHASHTABLE_INSERT_FAST
+       LIBCFS_RHASHTABLE_WALK_INIT_3ARG
+       # 4.8
+       LIBCFS_RHASHTABLE_LOOKUP
+       LIBCFS_RHLTABLE
+       LIBCFS_STACKTRACE_OPS
+       # 4.9
+       LIBCFS_GET_USER_PAGES_GUP_FLAGS
+       LIBCFS_RHASHTABLE_WALK_ENTER
+       # 4.10
+       LIBCFS_HOTPLUG_STATE_MACHINE
+       # 4.11
+       LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST
+       LIBCFS_KREF_READ
+       LIBCFS_RHT_BUCKET_VAR
+       # 4.12
+       LIBCFS_CPUS_READ_LOCK
+       LIBCFS_UUID_T
+       LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME
+       LIBCFS_MEMALLOC_NORECLAIM
+       # 4.13
+       LIBCFS_WAIT_QUEUE_ENTRY
+       # 4.14
+       LIBCFS_DEFINE_TIMER
+       LIBCFS_NEW_KERNEL_WRITE
+       LIBCFS_NEW_KERNEL_READ
+       # 4.15
+       LIBCFS_LOCKDEP_IS_HELD
+       LIBCFS_TIMER_SETUP
+       # 4.16
+       LIBCFS_HAVE_NS_TO_TIMESPEC64
+       LIBCFS_WAIT_VAR_EVENT
+       # 4.17
+       LIBCFS_BITMAP_ALLOC
+       LIBCFS_CLEAR_AND_WAKE_UP_BIT
+       # 4.18
+       LIBCFS_TCP_SOCK_SET_NODELAY
+       LIBCFS_TCP_SOCK_SET_KEEPIDLE
+       # 4.19
+       LIBCFS_XARRAY_SUPPORT
+       # 4.20
+       LIBCFS_HAVE_IOV_ITER_TYPE
+       # 5.0
+       LIBCFS_MM_TOTALRAM_PAGES_FUNC
+       LIBCFS_GET_REQUEST_KEY_AUTH
+       # 5.2
+       LIBCFS_KOBJ_TYPE_DEFAULT_GROUPS
+       # 5.3
+       LIBCFS_LOOKUP_USER_KEY
+       LIBCFS_FORCE_SIG_WITH_TASK
+       LIBCFS_CACHE_DETAIL_WRITERS
+       # 5.6
+       LIBCFS_HAVE_PROC_OPS
+       # 5.7
+       LIBCFS_TCP_SOCK_SET_QUICKACK
+       LIBCFS_TCP_SOCK_SET_KEEPINTVL
+       LIBCFS_TCP_SOCK_SET_KEEPCNT
+       # 5.8
+       LIBCFS_HAVE_NR_UNSTABLE_NFS
+       LIBCFS_HAVE_MMAP_LOCK
+       LIBCFS_KERNEL_SETSOCKOPT
+       LIBCFS_VMALLOC_2ARGS
+       # 5.10
+       LIBCFS_SEC_RELEASE_SECCTX
+       LIBCFS_HAVE_KFREE_SENSITIVE
+       LIBCFS_HAVE_LIST_CMP_FUNC_T
+       LIBCFS_NLA_STRSCPY
+       # 5.13
+       LIBCFS_HAVE_TASK_IS_RUNNING
+       LIBCFS_IOV_ITER_HAS_ITER_TYPE
+       # 5.15
+       LIBCFS_PARAM_SET_UINT_MINMAX
+       # 5.17
+       LIBCFS_PDE_DATA_EXISTS
+])
+
 #
 # LIBCFS_PROG_LINUX
 #
@@ -1810,134 +2216,31 @@ AC_MSG_NOTICE([LibCFS kernel checks
 ==============================================================================])
 LIBCFS_CONFIG_PANIC_DUMPLOG
 
-# 3.11
-LIBCFS_KTIME_GET_TS64
-# 3.12
-LIBCFS_PREPARE_TO_WAIT_EVENT
-LIBCFS_KERNEL_PARAM_OPS
-LIBCFS_KTIME_ADD
-LIBCFS_KTIME_AFTER
-LIBCFS_KTIME_BEFORE
-LIBCFS_KTIME_COMPARE
-LIBCFS_SHRINKER_COUNT
-# 3.15
-LIBCFS_IOV_ITER_HAS_TYPE
-# 3.16
-LIBCFS_HAVE_NS_TO_TIMESPEC64
-# 3.17
-LIBCFS_HLIST_ADD_AFTER
-LIBCFS_TIMESPEC64
-LIBCFS_KTIME_GET_NS
-LIBCFS_KTIME_GET_REAL_TS64
-LIBCFS_KTIME_GET_REAL_SECONDS
-LIBCFS_KTIME_GET_REAL_NS
-LIBCFS_KTIME_TO_TIMESPEC64
-LIBCFS_TIMESPEC64_SUB
-LIBCFS_TIMESPEC64_TO_KTIME
-# 3.19
-LIBCFS_KTIME_GET_SECONDS
-# 4.0
-LIBCFS_KTIME_MS_DELTA
-# 4.1
-LIBCFS_KERNEL_PARAM_LOCK
-# 4.2
-LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK
 # 4.3
 LIBCFS_HAVE_GFPFLAGS_ALLOW_BLOCKING
-# 4.4
-LIBCFS_KSTRTOBOOL_FROM_USER
-# 4.5
-LIBCFS_CRYPTO_HASH_HELPERS
-LIBCFS_EXPORT_KSET_FIND_OBJ
-LIBCFS_RHASHTABLE_REPLACE
-# 4.6
-LIBCFS_BROKEN_HASH_64
-LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT
-LIBCFS_GET_USER_PAGES_6ARG
+# 4.6 - Header Check
 LIBCFS_STRINGHASH
-# 4.7
-LIBCFS_RHASHTABLE_INSERT_FAST
-LIBCFS_RHASHTABLE_WALK_INIT_3ARG
-# 4.8
-LIBCFS_RHASHTABLE_LOOKUP
-LIBCFS_RHLTABLE
-LIBCFS_STACKTRACE_OPS
-# 4.9
-LIBCFS_GET_USER_PAGES_GUP_FLAGS
-LIBCFS_RHASHTABLE_WALK_ENTER
-# 4.10
-LIBCFS_HOTPLUG_STATE_MACHINE
+# 4.6 - Export Check
+LIBCFS_EXPORT_KSET_FIND_OBJ
+# 4.10 - Header Check
 LIBCFS_REFCOUNT_T
-# 4.11
-LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST
+# 4.11 - Header Check
 LIBCFS_SCHED_HEADERS
-LIBCFS_KREF_READ
-LIBCFS_RHT_BUCKET_VAR
-# 4.12
+# 4.13 - Header Checks
 LIBCFS_HAVE_PROCESSOR_HEADER
 LIBCFS_HAVE_WAIT_BIT_HEADER
-LIBCFS_MEMALLOC_NORECLAIM
-LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME
-LIBCFS_CPUS_READ_LOCK
-LIBCFS_UUID_T
-# 4.13
-LIBCFS_WAIT_QUEUE_ENTRY
-# 4.14
-LIBCFS_DEFINE_TIMER
-LIBCFS_NEW_KERNEL_WRITE
-LIBCFS_NEW_KERNEL_READ
+# 4.13 - Export Check
 LIBCFS_EXPORT_SAVE_STACK_TRACE_TSK
-# 4.15
-LIBCFS_LOCKDEP_IS_HELD
-LIBCFS_TIMER_SETUP
-# 4.16
-LIBCFS_WAIT_VAR_EVENT
-# 4.17
-LIBCFS_BITMAP_ALLOC
-LIBCFS_CLEAR_AND_WAKE_UP_BIT
-# 4.18
-LIBCFS_TCP_SOCK_SET_NODELAY
-LIBCFS_TCP_SOCK_SET_KEEPIDLE
-# 4.19
-LIBCFS_XARRAY_SUPPORT
-# 4.20
-LIBCFS_HAVE_IOV_ITER_TYPE
-# 5.0
-LIBCFS_MM_TOTALRAM_PAGES_FUNC
-LIBCFS_GET_REQUEST_KEY_AUTH
-# 5.2
-LIBCFS_KOBJ_TYPE_DEFAULT_GROUPS
-# 5.3
-LIBCFS_LOOKUP_USER_KEY
-LIBCFS_FORCE_SIG_WITH_TASK
-LIBCFS_CACHE_DETAIL_WRITERS
-LIBCFS_HAVE_NR_UNSTABLE_NFS
-# 5.7
+# 5.7 - Export Check and Header Check
 LIBCFS_KALLSYMS_LOOKUP
-LIBCFS_TCP_SOCK_SET_QUICKACK
-LIBCFS_TCP_SOCK_SET_KEEPINTVL
-LIBCFS_TCP_SOCK_SET_KEEPCNT
-# 5.8
-LIBCFS_HAVE_MMAP_LOCK
-LIBCFS_KERNEL_SETSOCKOPT
-LIBCFS_VMALLOC_2ARGS
-LIBCFS_SEC_RELEASE_SECCTX
-# 5.10
-LIBCFS_HAVE_KFREE_SENSITIVE
 LIBCFS_HAVE_CRYPTO_SHA2_HEADER
-LIBCFS_HAVE_LIST_CMP_FUNC_T
-# 5.12
+# 5.12 - Header Check
 LIBCFS_HAVE_CIPHER_HEADER
-# 5.13
-LIBCFS_HAVE_TASK_IS_RUNNING
-# 5.14
+# 5.14 - Header Checks
 LIBCFS_LINUX_STDARG_HEADER
 LIBCFS_HAVE_PANIC_NOTIFIER_HEADER
-# 5.15
-LIBCFS_PARAM_SET_UINT_MINMAX
+# 5.15 - Header Check
 LIBCFS_LINUX_BLK_INTEGRITY_HEADER
-# 5.17
-LIBCFS_PDE_DATA_EXISTS
 ]) # LIBCFS_PROG_LINUX
 
 #