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linux-sg2042
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Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 debug update from Ingo Molnar:
 "A single change enhancing stack traces by hiding wrapper function
  entries"

* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/stacktrace: Avoid recording save_stack_trace() wrappers
This commit is contained in:
Linus Torvalds 2017-11-13 17:02:57 -08:00
parent eb4d47c8ce 77072f09ea
commit 13e57da4a5
1 changed files with 7 additions and 3 deletions
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10
arch/x86/kernel/stacktrace.c
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@ -30,7 +30,7 @@ static int save_stack_address(struct stack_trace *trace, unsigned long addr,
return 0;
}
static void __save_stack_trace(struct stack_trace *trace,
static void noinline __save_stack_trace(struct stack_trace *trace,
struct task_struct *task, struct pt_regs *regs,
bool nosched)
{
@ -56,6 +56,7 @@ static void __save_stack_trace(struct stack_trace *trace,
*/
void save_stack_trace(struct stack_trace *trace)
{
trace->skip++;
__save_stack_trace(trace, current, NULL, false);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
@ -70,6 +71,8 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
if (!try_get_task_stack(tsk))
return;
if (tsk == current)
trace->skip++;
__save_stack_trace(trace, tsk, NULL, true);
put_task_stack(tsk);
@ -88,8 +91,9 @@ EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
} \
})
static int __save_stack_trace_reliable(struct stack_trace *trace,
struct task_struct *task)
static int __always_inline
__save_stack_trace_reliable(struct stack_trace *trace,
struct task_struct *task)
{
struct unwind_state state;
struct pt_regs *regs;