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author | 2013-02-04 12:12:33 +0000 | |
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committer | 2013-02-11 18:16:41 +0000 | |
commit | 3a0310eb369aae985d6409d8ff1340146578e5c1 (patch) | |
tree | 8b1796a500d2dd694c924a57ee4502f31b15ef8b /arch/arm64/Kconfig.debug | |
parent | arm64: compat: use compat_uptr_t type for compat_ucontext.uc_link (diff) | |
download | linux-3a0310eb369aae985d6409d8ff1340146578e5c1.tar.gz linux-3a0310eb369aae985d6409d8ff1340146578e5c1.tar.bz2 linux-3a0310eb369aae985d6409d8ff1340146578e5c1.zip |
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>
Diffstat (limited to 'arch/arm64/Kconfig.debug')
0 files changed, 0 insertions, 0 deletions