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Subject[PATCH V4 0/3] csky: Optimize atomic_ops & cmpxchg
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From: Guo Ren <guoren@linux.alibaba.com>

Optimize arch_xchg|cmpxchg|cmpxchg_local with ASM acquire|release
instructions instead of previous C based.

The generic atomic.h used cmpxchg to implement the atomic
operations, it will cause daul loop to reduce the forward
guarantee. The patch implement csky custom atomic operations with
ldex/stex instructions for the best performance.

Changes in V4:
- Remove RELEASE_FENCE in ldex/stex loop by Buoqun's advice

Changes in V3:
- Add arch_atomic_(fetch_add_unless, inc_unless_negative,
dec_unless_positive, dec_if_positive)

Changes in V2:
- Fixup use of acquire + release for barrier semantics by Rutland.

Guo Ren (3):
csky: atomic: Optimize cmpxchg with acquire & release
csky: atomic: Add custom atomic.h implementation
csky: atomic: Add conditional atomic operations' optimization

arch/csky/include/asm/atomic.h | 237 ++++++++++++++++++++++++++++++++
arch/csky/include/asm/barrier.h | 11 +-
arch/csky/include/asm/cmpxchg.h | 64 ++++++++-
3 files changed, 304 insertions(+), 8 deletions(-)
create mode 100644 arch/csky/include/asm/atomic.h

--
2.25.1

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