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

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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
Download Patch File Download Diff File Expand all files Collapse all files
arch/x86/kernel/stacktrace.c
+7 -3
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@@ -30,7 +30,7 @@ static int save_stack_address(struct stack_trace *trace, unsigned long addr,
return 0; 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, struct task_struct *task, struct pt_regs *regs,
bool nosched) bool nosched)
{ {
@@ -56,6 +56,7 @@ static void __save_stack_trace(struct stack_trace *trace,
*/ */
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); __save_stack_trace(trace, current, NULL, false);
} }
EXPORT_SYMBOL_GPL(save_stack_trace); 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)) if (!try_get_task_stack(tsk))
return; return;
if (tsk == current)
trace->skip++;
__save_stack_trace(trace, tsk, NULL, true); __save_stack_trace(trace, tsk, NULL, true);
put_task_stack(tsk); 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, static int __always_inline
struct task_struct *task) __save_stack_trace_reliable(struct stack_trace *trace,
struct task_struct *task)
{ {
struct unwind_state state; struct unwind_state state;
struct pt_regs *regs; struct pt_regs *regs;