From: Mark Rutland <mark.rutland@arm.com>
Date: Thu, 28 Apr 2011 09:17:04 +0000 (+0100)
Subject: ARM: perf: lock PMU registers per-CPU
X-Git-Tag: v3.2-rc1~130^2~7^2^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f78d2d5ccf72ec834da6901886a40fd8e3b7615;p=pandora-kernel.git

ARM: perf: lock PMU registers per-CPU

Currently, a single lock serialises access to CPU PMU registers. This
global locking is unnecessary as PMU registers are local to the CPU
they monitor.

This patch replaces the global lock with a per-CPU lock. As the lock is
in struct cpu_hw_events, PMUs providing a single cpu_hw_events instance
can be locked globally.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

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