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| author |   Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> | 2014-05-13 22:30:56 +0300 |
|---|---|---|
| committer |   Stafford Horne <shorne@gmail.com> | 2017-02-25 04:14:06 +0900 |
| commit | bc19598f1dde267e5214e386b97bb647973275db (patch) | |
| tree | fb35f0097281aa51ce3b629342f4a4287693a7de /include/asm-generic/atomic.h | |
| parent | openrisc: add cmpxchg and xchg implementations (diff) | |
| download | linux-dev-bc19598f1dde267e5214e386b97bb647973275db.tar.xz linux-dev-bc19598f1dde267e5214e386b97bb647973275db.zip | |
openrisc: add optimized atomic operations
Using the l.lwa and l.swa atomic instruction pair.
Most openrisc processor cores provide these instructions now. If the
instructions are not available emulation is provided.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
[shorne@gmail.com: remove OPENRISC_HAVE_INST_LWA_SWA config suggesed by
Alan Cox https://lkml.org/lkml/2014/7/23/666]
[shorne@gmail.com: expand to implement all ops suggested by Peter
Zijlstra https://lkml.org/lkml/2017/2/20/317]
Signed-off-by: Stafford Horne <shorne@gmail.com>
Diffstat (limited to 'include/asm-generic/atomic.h')
| -rw-r--r-- | include/asm-generic/atomic.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h index 9ed8b987185b..3f38eb03649c 100644 --- a/include/asm-generic/atomic.h +++ b/include/asm-generic/atomic.h @@ -223,6 +223,7 @@ static inline void atomic_dec(atomic_t *v) #define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v))) #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new))) +#ifndef __atomic_add_unless static inline int __atomic_add_unless(atomic_t *v, int a, int u) { int c, old; @@ -231,5 +232,6 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u) c = old; return c; } +#endif #endif /* __ASM_GENERIC_ATOMIC_H */ |