From: Vineet Gupta <vgupta@synopsys.com>
Date: Thu, 28 Nov 2013 08:27:54 +0000 (+0530)
Subject: ARC: [SMP] optimize IPI send and receive
X-Git-Tag: v3.14-rc1~98^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d8e8c7dda11f5d5cf90495f2e89d917a83509bc0;p=pandora-kernel.git

ARC: [SMP] optimize IPI send and receive

* Don't send an IPI if receiver already has a pending IPI.
  Atomically piggyback the new msg with pending msg.

* IPI receiver looping on xchg() not required

References: https://lkml.org/lkml/2013/11/25/232
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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