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>

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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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