b=19808 fix d_obtain_alias() misuse due to compat macro.

[fs/lustre-release.git] / lustre / autoconf / lustre-core.m4

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index c632a48..eae0087 100644 (file)
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -700,26 +700,6 @@ LB_LINUX_TRY_COMPILE([
 ])
 
 #
-# LC_D_OBTAIN_ALIAS
-# starting from 2.6.18 kernel don't export do_kern_mount
-# and want to use vfs_kern_mount instead.
-#
-AC_DEFUN([LC_D_OBTAIN_ALIAS],
-[AC_MSG_CHECKING([d_obtain_alias exist in kernel])
-LB_LINUX_TRY_COMPILE([
-        #include <linux/dcache.h>
-],[
-        d_obtain_alias(NULL);
-],[
-        AC_DEFINE(HAVE_D_OBTAIN_ALIAS, 1,
-                [d_obtain_alias exist in kernel])
-        AC_MSG_RESULT([yes])
-],[
-        AC_MSG_RESULT([no])
-])
-])
-
-#
 # LC_INVALIDATEPAGE_RETURN_INT
 # 2.6.17 changes return type for invalidatepage to 'void' from 'int'
 #
@@ -1850,6 +1830,26 @@ LB_LINUX_TRY_COMPILE([
 ])
 ])
 
+#
+# LC_D_OBTAIN_ALIAS
+# starting from 2.6.28 kernel replaces d_alloc_anon() with
+# d_obtain_alias() for getting anonymous dentries
+#
+AC_DEFUN([LC_D_OBTAIN_ALIAS],
+[AC_MSG_CHECKING([d_obtain_alias exist in kernel])
+LB_LINUX_TRY_COMPILE([
+        #include <linux/dcache.h>
+],[
+        d_obtain_alias(NULL);
+],[
+        AC_DEFINE(HAVE_D_OBTAIN_ALIAS, 1,
+                [d_obtain_alias exist in kernel])
+        AC_MSG_RESULT([yes])
+],[
+        AC_MSG_RESULT([no])
+])
+])
+
 # 2.6.31 replaces blk_queue_hardsect_size by blk_queue_logical_block_size function
 AC_DEFUN([LC_BLK_QUEUE_LOG_BLK_SIZE],
 [AC_MSG_CHECKING([if blk_queue_logical_block_size is defined])