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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-14 02:02:57 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-14 02:02:57 +0100 |
| commit | 13e57da4a5eaae0b400cf06c37b7e9b5347b7335 (patch) | |
| tree | c1f08cf9351ef3f627efa846d2b4cbb275dfbeff | |
| parent | Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/k... (diff) | |
| parent | x86/stacktrace: Avoid recording save_stack_trace() wrappers (diff) | |
| download | linux-13e57da4a5eaae0b400cf06c37b7e9b5347b7335.tar.xz linux-13e57da4a5eaae0b400cf06c37b7e9b5347b7335.zip | |
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
| -rw-r--r-- | arch/x86/kernel/stacktrace.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 8dabd7bf1673..77835bc021c7 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -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; |