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tracing: Allow arch-specific stack tracer

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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>
This commit is contained in:
AKASHI Takahiro
2015-10-30 14:25:39 +09:00
committed by Steven Rostedt
parent 2ee8a74f2a
commit bb99d8ccec
2 changed files with 54 additions and 37 deletions
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11
include/linux/ftrace.h
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@@ -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,