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riscv, atomic: Add #define's for the atomic_{cmp,}xchg_*() variants 

If an architecture does not define the atomic_{cmp,}xchg_*() variants,
the generic implementation defaults them to the fully-ordered version.

riscv's had its own variants since "the beginning", but it never told
(#define-d these for) the generic implementation: it is time to do so.

Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Andrea Parri 2018-12-01 01:01:56 +01:00 committed by Palmer Dabbelt
parent 7566ec393f
commit 8b699616f3
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1 changed files with 9 additions and 0 deletions
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9
arch/riscv/include/asm/atomic.h
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@ -303,6 +303,15 @@ c_t atomic##prefix##_cmpxchg(atomic##prefix##_t *v, c_t o, c_t n) \
ATOMIC_OPS()
#define atomic_xchg_relaxed atomic_xchg_relaxed
#define atomic_xchg_acquire atomic_xchg_acquire
#define atomic_xchg_release atomic_xchg_release
#define atomic_xchg atomic_xchg
#define atomic_cmpxchg_relaxed atomic_cmpxchg_relaxed
#define atomic_cmpxchg_acquire atomic_cmpxchg_acquire
#define atomic_cmpxchg_release atomic_cmpxchg_release
#define atomic_cmpxchg atomic_cmpxchg
#undef ATOMIC_OPS
#undef ATOMIC_OP