From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 25 Feb 2009 07:40:09 +0000 (+0100)
Subject: tracing/hw-branch-tracing: convert bts-tracer mutex to a spinlock
X-Git-Tag: v2.6.30-rc1~2^2~84^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d542cf34264ac92e9e7ac55c0b096b066d569d2;p=pandora-kernel.git

tracing/hw-branch-tracing: convert bts-tracer mutex to a spinlock

Impact: fix CPU hotplug lockup

bts_hotcpu_handler() is called with irqs disabled, so using mutex_lock()
is a no-no.

All the BTS codepaths here are atomic (they do not schedule), so using
a spinlock is the right solution.

Cc: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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