From: Will Deacon <will.deacon@arm.com>
Date: Wed, 9 Oct 2013 16:19:22 +0000 (+0100)
Subject: ARM: 7854/1: lockref: add support for lockless lockrefs using cmpxchg64
X-Git-Tag: v3.13-rc1~103^2~2^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0cbad9c9dfe0c38e8ec7385b39087c005a6dee3e;p=pandora-kernel.git

ARM: 7854/1: lockref: add support for lockless lockrefs using cmpxchg64

Our spinlocks are only 32-bit (2x16-bit tickets) and, on processors
with 64-bit atomic instructions, cmpxchg64 makes use of the double-word
exclusive accessors.

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

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

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