Andrew Murray addfc38672 arm64: atomics: avoid out-of-line ll/sc atomics ... When building for LSE atomics (CONFIG_ARM64_LSE_ATOMICS), if the hardware or toolchain doesn't support it the existing code will fallback to ll/sc atomics. It achieves this by branching from inline assembly to a function that is built with special compile flags. Further this results in the clobbering of registers even when the fallback isn't used increasing register pressure. Improve this by providing inline implementations of both LSE and ll/sc and use a static key to select between them, which allows for the compiler to generate better atomics code. Put the LL/SC fallback atomics in their own subsection to improve icache performance. Signed-off-by: Andrew Murray <andrew.murray@arm.com> Signed-off-by: Will Deacon <will@kernel.org>		2019-08-29 15:53:42 +01:00
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asm	arm64: atomics: avoid out-of-line ll/sc atomics	2019-08-29 15:53:42 +01:00
uapi/asm	treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers	2019-07-25 11:05:10 +02:00