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Magnus Karlsson authored
Replace our own homegrown assembly store/release and load/acquire implementations with the HW agnositic atomic APIs C11 offers. This to make the code more portable, easier to read, and reduce the maintenance burden. The original code used load-acquire and store-release barriers hand-coded in assembly. Since C11, these kind of operations are offered as built-ins in gcc and llvm. The load-acquire operation prevents hoisting of non-atomic memory operations to before this operation and it corresponds to the __ATOMIC_ACQUIRE operation in the built-in atomics. The store-release operation prevents hoisting of non-atomic memory operations to after this operation and it corresponds to the __ATOMIC_RELEASE operation in the built-in atomics. Signed-off-by:
Magnus Karlsson <magnus.karlsson@intel.com> Acked-by:
Maciej Fijalkowski <maciej.fijalkowski@intel.com> Link: https://lore.kernel.org/r/20230111093526.11682-8-magnus.karlsson@gmail.comSigned-off-by:
Alexei Starovoitov <ast@kernel.org>
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