From: Will Deacon <will.deacon@arm.com>
Date: Tue, 3 Sep 2013 09:44:00 +0000 (+0100)
Subject: asm-generic: io: implement relaxed accessor macros as conditional wrappers
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~8^2~2^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9439eb3ab9d1ece6e4ad7baaa4a7f534f9b9dab0;p=pandora-kernel.git

asm-generic: io: implement relaxed accessor macros as conditional wrappers

{read,write}{b,w,l,q}_relaxed are implemented by some architectures in
order to permit memory-mapped I/O accesses with weaker barrier semantics
than the non-relaxed variants.

This patch adds wrappers to asm-generic so that drivers can rely on the
relaxed accessors being available, even if they don't always provide
weaker ordering guarantees. Since some architectures both include
asm-generic/io.h and define some relaxed accessors, the definitions here
are conditional for the time being.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

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