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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-03-13 20:43:57 -0400
committerSteven Rostedt <rostedt@goodmis.org>2013-03-15 00:36:06 -0400
commit87889501d0adfae10e3b0f0e6f2d7536eed9ae84 (patch)
treec103cc8bf1687f5ffe54ff7f17c7672bda20cad1 /kernel/trace/trace_stack.c
parentdd42cd3ea96d687f15525c4f14fa582702db223f (diff)
downloadop-kernel-dev-87889501d0adfae10e3b0f0e6f2d7536eed9ae84.zip
op-kernel-dev-87889501d0adfae10e3b0f0e6f2d7536eed9ae84.tar.gz
tracing: Use stack of calling function for stack tracer
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. Cc: stable@vger.kernel.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_stack.c')
-rw-r--r--kernel/trace/trace_stack.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 42ca822..dc02e29 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -39,20 +39,21 @@ 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);
@@ -73,7 +74,7 @@ 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 void
stack_trace_call(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *pt_regs)
{
+ unsigned long stack;
int cpu;
preempt_disable_notrace();
@@ -122,7 +124,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip,
if (per_cpu(trace_active, cpu)++ != 0)
goto out;
- check_stack();
+ check_stack(&stack);
out:
per_cpu(trace_active, cpu)--;
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