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authorWill Deacon <will.deacon@arm.com>2013-02-04 12:12:33 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2013-02-11 18:16:41 +0000
commit3a0310eb369aae985d6409d8ff1340146578e5c1 (patch)
tree8b1796a500d2dd694c924a57ee4502f31b15ef8b /drivers/net/ieee802154
parentc0e01d5d8f15c085236df184e5bc3d79a8b700cd (diff)
downloadblackbird-op-linux-3a0310eb369aae985d6409d8ff1340146578e5c1.tar.gz
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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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