powerpc: atomic: Implement acquire/release/relaxed variants for xchg

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Implement xchg{,64}_relaxed and atomic{,64}_xchg_relaxed, based on these
_relaxed variants, release/acquire variants and fully ordered versions
can be built.

Note that xchg{,64}_relaxed and atomic_{,64}_xchg_relaxed are not
compiler barriers.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Boqun Feng 2015-12-15 22:24:16 +08:00 • committed by Michael Ellerman

parent dc53617c4a

commit 26760fc19a

2 changed files with 32 additions and 39 deletions

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2

arch/powerpc/include/asm/atomic.h

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101

arch/powerpc/include/asm/cmpxchg.h

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