Boqun Feng 56c08e6d22 powerpc: atomic: Implement acquire/release/relaxed variants for cmpxchg ... Implement cmpxchg{,64}_relaxed and atomic{,64}_cmpxchg_relaxed, based on which _release variants can be built. To avoid superfluous barriers in _acquire variants, we implement these operations with assembly code rather use __atomic_op_acquire() to build them automatically. For the same reason, we keep the assembly implementation of fully ordered cmpxchg operations. However, we don't do the similar for _release, because that will require putting barriers in the middle of ll/sc loops, which is probably a bad idea. Note cmpxchg{,64}_relaxed and atomic{,64}_cmpxchg_relaxed are not compiler barriers. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2016-02-18 00:11:39 +11:00
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asm	powerpc: atomic: Implement acquire/release/relaxed variants for cmpxchg	2016-02-18 00:11:39 +11:00
uapi/asm	powerpc: Wire up copy_file_range() syscall	2016-01-21 14:10:55 +11:00