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| author |   AKASHI Takahiro <takahiro.akashi@linaro.org> | 2015-10-30 14:25:39 +0900 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2015-11-03 14:31:06 -0500 |
| commit | bb99d8ccec7f83a2730a29d1ae7eee5ffa446a9e (patch) | |
| tree | 489004dcbfaefbf93282a12d241e5551f4ab133f /include/linux/ftrace.h | |
| parent | recordmcount: arm64: Replace the ignored mcount call into nop (diff) | |
| download | linux-dev-bb99d8ccec7f83a2730a29d1ae7eee5ffa446a9e.tar.xz linux-dev-bb99d8ccec7f83a2730a29d1ae7eee5ffa446a9e.zip | |
tracing: Allow arch-specific stack tracer
A stack frame may be used in a different way depending on cpu architecture.
Thus it is not always appropriate to slurp the stack contents, as current
check_stack() does, in order to calcurate a stack index (height) at a given
function call. At least not on arm64.
In addition, there is a possibility that we will mistakenly detect a stale
stack frame which has not been overwritten.
This patch makes check_stack() a weak function so as to later implement
arch-specific version.
Link: http://lkml.kernel.org/r/1446182741-31019-5-git-send-email-takahiro.akashi@linaro.org
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
| -rw-r--r-- | include/linux/ftrace.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 6cd8c0ee4b6f..b4c92ab9e08b 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -263,7 +263,18 @@ static inline void ftrace_kill(void) { } #endif /* CONFIG_FUNCTION_TRACER */ #ifdef CONFIG_STACK_TRACER + +#define STACK_TRACE_ENTRIES 500 + +struct stack_trace; + +extern unsigned stack_trace_index[]; +extern struct stack_trace stack_trace_max; +extern unsigned long stack_trace_max_size; +extern arch_spinlock_t max_stack_lock; + extern int stack_tracer_enabled; +void stack_trace_print(void); int stack_trace_sysctl(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, |