From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Sun, 16 Nov 2008 04:59:52 +0000 (+0100)
Subject: tracing/branch-tracer: fix a trace recursion on branch tracer
X-Git-Tag: v2.6.29-rc1~586^2~59
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=072b40a15616fe6bea68466e6bffcfcbf5c8f26f;p=pandora-kernel.git

tracing/branch-tracer: fix a trace recursion on branch tracer

Impact: fix crash when enabling the branch-tracer

When the branch tracer inserts an event through
probe_likely_condition(), it calls local_irq_save() and then results
in a trace recursion.

local_irq_save() -> trace_hardirqs_off() -> trace_hardirqs_off_caller()
	-> unlikely()

The trace_branch.c file is protected by DISABLE_BRANCH_PROFILING but
that doesn't prevent from external call to functions that use
unlikely().

My box crashed each time I tried to set this tracer (sudden and hard
reboot).

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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