From: Will Deacon <will.deacon@arm.com>
Date: Wed, 9 Oct 2013 16:01:21 +0000 (+0100)
Subject: ARM: 7852/1: cmpxchg: implement barrier-less cmpxchg64_local
X-Git-Tag: v3.13-rc1~103^2~2^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2523c67bb6962f98193dce1c73b6efb65a6ea92c;p=pandora-kernel.git

ARM: 7852/1: cmpxchg: implement barrier-less cmpxchg64_local

Our cmpxchg64 macros are wrappers around atomic64_cmpxchg. Whilst this is
great for code re-use, there is a case for barrier-less cmpxchg where it
is known to be safe (for example cmpxchg64_local and cmpxchg-based
lockrefs).

This patch introduces a 64-bit cmpxchg implementation specifically
for the cmpxchg64_* macros, so that it can be later used by the lockref
code.

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