Patch "tracing: Use stack of calling function for stack tracer" has been added to the 3.4-stable tree

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This is a note to let you know that I've just added the patch titled

    tracing: Use stack of calling function for stack tracer

to the 3.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tracing-use-stack-of-calling-function-for-stack-tracer.patch
and it can be found in the queue-3.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 87889501d0adfae10e3b0f0e6f2d7536eed9ae84 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
Date: Wed, 13 Mar 2013 20:43:57 -0400
Subject: tracing: Use stack of calling function for stack tracer

From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>

commit 87889501d0adfae10e3b0f0e6f2d7536eed9ae84 upstream.

Use the stack of stack_trace_call() instead of check_stack() as
the test pointer for max stack size. It makes it a bit cleaner
and a little more accurate.

Adding stable, as a later fix depends on this patch.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 kernel/trace/trace_stack.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -40,20 +40,21 @@ static DEFINE_MUTEX(stack_sysctl_mutex);
 int stack_tracer_enabled;
 static int last_stack_tracer_enabled;
 
-static inline void check_stack(void)
+static inline void
+check_stack(unsigned long *stack)
 {
 	unsigned long this_size, flags;
 	unsigned long *p, *top, *start;
 	int i;
 
-	this_size = ((unsigned long)&this_size) & (THREAD_SIZE-1);
+	this_size = ((unsigned long)stack) & (THREAD_SIZE-1);
 	this_size = THREAD_SIZE - this_size;
 
 	if (this_size <= max_stack_size)
 		return;
 
 	/* we do not handle interrupt stacks yet */
-	if (!object_is_on_stack(&this_size))
+	if (!object_is_on_stack(stack))
 		return;
 
 	local_irq_save(flags);
@@ -74,7 +75,7 @@ static inline void check_stack(void)
 	 * Now find where in the stack these are.
 	 */
 	i = 0;
-	start = &this_size;
+	start = stack;
 	top = (unsigned long *)
 		(((unsigned long)start & ~(THREAD_SIZE-1)) + THREAD_SIZE);
 
@@ -113,6 +114,7 @@ static inline void check_stack(void)
 static void
 stack_trace_call(unsigned long ip, unsigned long parent_ip)
 {
+	unsigned long stack;
 	int cpu;
 
 	if (unlikely(!ftrace_enabled || stack_trace_disabled))
@@ -125,7 +127,7 @@ stack_trace_call(unsigned long ip, unsig
 	if (per_cpu(trace_active, cpu)++ != 0)
 		goto out;
 
-	check_stack();
+	check_stack(&stack);
 
  out:
 	per_cpu(trace_active, cpu)--;


Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are

queue-3.4/tracing-fix-off-by-one-on-allocating-stat-pages.patch
queue-3.4/tracing-use-stack-of-calling-function-for-stack-tracer.patch
queue-3.4/tracing-fix-stack-tracer-with-fentry-use.patch
queue-3.4/tracing-remove-most-or-all-of-stack-tracer-stack-size-from-stack_max_size.patch
queue-3.4/tracing-reset-ftrace_graph_filter_enabled-if-count-is-zero.patch
queue-3.4/tracing-check-return-value-of-tracing_init_dentry.patch
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