From: Will Deacon <will.deacon@arm.com>
Date: Thu, 28 Mar 2013 10:25:03 +0000 (+0100)
Subject: ARM: 7687/1: atomics: don't use exclusives for atomic64 read/set with LPAE
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~51^2~1^5~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4fd75911f6970478444eece952dacb2db9d1e5a5;p=pandora-kernel.git

ARM: 7687/1: atomics: don't use exclusives for atomic64 read/set with LPAE

To ease page table updates with 64-bit descriptors, CPUs implementing
LPAE are required to implement ldrd/strd as atomic operations.

This patch uses these accessors instead of the exclusive variants when
performing atomic64_{read,set} on LPAE systems.

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