From: yangsheng <Sheng.Yang@sun.com>
Date: Fri, 8 Oct 2010 09:54:42 +0000 (+0800)
Subject: b=22375 Add walk_stack callback for dump_trace.
X-Git-Tag: 2.0.54.0~41
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=7d649777daf616ae2b8ff7f8377f6dca71a5d956

b=22375 Add walk_stack callback for dump_trace.

o=sebastien.buisson@bull.net
i=adilger
i=yangsheng
---

diff --git a/libcfs/autoconf/lustre-libcfs.m4 b/libcfs/autoconf/lustre-libcfs.m4
index 6932513..e888679 100644
--- a/libcfs/autoconf/lustre-libcfs.m4
+++ b/libcfs/autoconf/lustre-libcfs.m4
@@ -621,6 +621,34 @@ LB_LINUX_TRY_COMPILE([
 ])
 
 #
+# LIBCFS_STACKTRACE_OPS_HAVE_WALK_STACK
+#
+# 2.6.32-30.el6 adds a new 'walk_stack' field in 'struct stacktrace_ops'
+#
+AC_DEFUN([LIBCFS_STACKTRACE_OPS_HAVE_WALK_STACK],
+[AC_MSG_CHECKING([if 'struct stacktrace_ops' has 'walk_stack' field])
+LB_LINUX_TRY_COMPILE([
+        #include <asm/stacktrace.h>
+	unsigned long walkstack(struct thread_info *tinfo,
+                                           unsigned long *stack,
+                                           unsigned long bp,
+                                           const struct stacktrace_ops *ops,
+                                           void *data,
+                                           unsigned long *end,
+                                           int *graph);
+],[
+        struct stacktrace_ops ops;
+
+	ops.walk_stack = walkstack;
+],[
+        AC_MSG_RESULT([yes])
+        AC_DEFINE(STACKTRACE_OPS_HAVE_WALK_STACK, 1, ['struct stacktrace_ops' has 'walk_stack' field])
+],[
+        AC_MSG_RESULT([no])
+])
+])
+
+#
 # LIBCFS_PROG_LINUX
 #
 # LNet linux kernel checks
@@ -666,6 +694,8 @@ LIBCFS_STRUCT_CRED_IN_TASK
 # 2.6.30
 LIBCFS_FUNC_UNSHARE_FS_STRUCT
 LIBCFS_SOCK_MAP_FD_2ARG
+# 2.6.32
+LIBCFS_STACKTRACE_OPS_HAVE_WALK_STACK
 ])
 
 #
diff --git a/libcfs/libcfs/linux/linux-debug.c b/libcfs/libcfs/linux/linux-debug.c
index 3c60f6e..363ec8c 100644
--- a/libcfs/libcfs/linux/linux-debug.c
+++ b/libcfs/libcfs/linux/linux-debug.c
@@ -249,6 +249,9 @@ static DUMP_TRACE_CONST struct stacktrace_ops print_trace_ops = {
 	.warning_symbol = print_trace_warning_symbol,
 	.stack = print_trace_stack,
 	.address = print_trace_address,
+#ifdef STACKTRACE_OPS_HAVE_WALK_STACK
+	.walk_stack = print_context_stack,
+#endif
 };
 #endif