From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Fri, 21 Jan 2011 18:01:53 +0000 (+0800)
Subject: MIPS, Tracing: Fix set_graph_function of function graph tracer
X-Git-Tag: v2.6.38~2^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9f07eb2f25a64098e2ba223c1a2fe2a8f249e01;p=pandora-kernel.git

MIPS, Tracing: Fix set_graph_function of function graph tracer

trace.func should be set to the recorded ip of the mcount calling site
in the __mcount_loc section to filter the function entries configured
through the tracing/set_graph_function interface, but before, this is
set to the self_ra(the return address of mcount), which has made
set_graph_function not work as expected.

This fixes it via calculating the right recorded ip in the __mcount_loc
section and assign it to trace.func.

Reported-by: Zhiping Zhong <xzhong86@163.com>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2017/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>
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