ARM: stacktrace: avoid listing stacktrace functions in stacktrace

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commit 3683f44c42 upstream.

While debugging the FEC ethernet driver using stacktrace, it was noticed
that the stacktraces always begin as follows:

 [<c00117b4>] save_stack_trace_tsk+0x0/0x98
 [<c0011870>] save_stack_trace+0x24/0x28
 ...

This is because the stack trace code includes the stack frames for itself.
This is incorrect behaviour, and also leads to "skip" doing the wrong
thing (which is the number of stack frames to avoid recording.)

Perversely, it does the right thing when passed a non-current thread.  Fix
this by ensuring that we have a known constant number of frames above the
main stack trace function, and always skip these.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Russell King 2014-05-03 11:03:28 +01:00 • committed by Greg Kroah-Hartman

parent ba04d37587

commit 31ce3db939

1 changed files with 13 additions and 5 deletions

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arch/arm/kernel/stacktrace.c

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