From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 19 May 2015 00:00:53 +0000 (+0000)
Subject: perf/x86/intel/cqm: Remove pointless spinlock from state cache
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~210^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e7eaac95af6c1aecaf558b8c7a1757d5f2d2ad7;p=pandora-kernel.git

perf/x86/intel/cqm: Remove pointless spinlock from state cache

'struct intel_cqm_state' is a strict per CPU cache of the rmid and the
usage counter. It can never be modified from a remote CPU.

The three functions which modify the content: intel_cqm_event[start|stop|del]
(del maps to stop) are called from the perf core with interrupts disabled
which is enough protection for the per CPU state values.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Cc: Kanaka Juvva <kanaka.d.juvva@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: Will Auld <will.auld@intel.com>
Link: http://lkml.kernel.org/r/20150518235150.001006529@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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