From: jia zhang <jia.zhang2008@gmail.com>
Date: Sun, 23 Nov 2008 14:47:10 +0000 (+0800)
Subject: x86, debug: remove the confusing entry in call trace
X-Git-Tag: v2.6.29-rc1~587^2~1^2~5^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f5db591326779a80cfe490c5d6b6ce9fac08b31;p=pandora-kernel.git

x86, debug: remove the confusing entry in call trace

Impact: improve backtrace quality

avoid the confusion in call trace because of the lack of padding at the
tail of function.

When do_exit gets called, the return address behind call instruction is
pushed into stack. If something get wrong in do_exit, for x86_64, the
entry "kernel_execve +0x00/0xXX" rather than "child_rip +0xYY/0xZZ" is
in the call trace.

That looks confusing, so add a u2d to make the return address still part
of the original call site. (This also catches any instances of us returning
from that function somehow.)

Signed-off-by: jia zhang <jia.zhang2008@gmail.com>
Acked-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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