Robin Murphy 8df728e1ae arm64: Remove redundant mov from LL/SC cmpxchg ... The cmpxchg implementation introduced by commit c342f78217 ("arm64: cmpxchg: patch in lse instructions when supported by the CPU") performs an apparently redundant register move of [old] to [oldval] in the success case - it always uses the same register width as [oldval] was originally loaded with, and is only executed when [old] and [oldval] are known to be equal anyway. The only effect it seemingly does have is to take up a surprising amount of space in the kernel text, as removing it reveals: text data bss dec hex filename 12426658 1348614 4499749 18275021 116dacd vmlinux.o.new 12429238 1348614 4499749 18277601 116e4e1 vmlinux.o.old Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2017-05-15 18:30:10 +01:00
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asm	arm64: Remove redundant mov from LL/SC cmpxchg	2017-05-15 18:30:10 +01:00
uapi/asm	Kbuild UAPI header export updates for v4.12	2017-05-10 20:45:36 -07:00