From: Will Deacon <will.deacon@arm.com>
Date: Mon, 4 Feb 2013 12:12:33 +0000 (+0000)
Subject: arm64: atomics: fix grossly inconsistent asm constraints for exclusives
X-Git-Tag: v3.9-rc1~141^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a0310eb369aae985d6409d8ff1340146578e5c1;p=pandora-kernel.git

arm64: atomics: fix grossly inconsistent asm constraints for exclusives

Our uses of inline asm constraints for atomic operations are fairly
wild and varied. We basically need to guarantee the following:

  1. Any instructions with barrier implications
     (load-acquire/store-release) have a "memory" clobber

  2. When performing exclusive accesses, the addresing mode is generated
     using the "Q" constraint

  3. Atomic blocks which use the condition flags, have a "cc" clobber

This patch addresses these concerns which, as well as fixing the
semantics of the code, stops GCC complaining about impossible asm
constraints.

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