From: Will Deacon <will.deacon@arm.com>
Date: Wed, 9 Oct 2013 14:54:27 +0000 (+0100)
Subject: arm64: lockref: add support for lockless lockrefs using cmpxchg
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~54^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5686b06cea34e31ec0a549d9b5ac00776e8e8d6d;p=pandora-kernel.git

arm64: lockref: add support for lockless lockrefs using cmpxchg

Our spinlocks are only 32-bit (2x16-bit tickets) and our cmpxchg can
deal with 8-bytes (as one would hope!).

This patch wires up the cmpxchg-based lockless lockref implementation
for arm64.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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