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| author | Vineet Gupta <vgupta@kernel.org> | 2020-05-09 09:15:36 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@kernel.org> | 2021-08-24 23:25:47 +0200 |
| commit | ddc348c44d82d0b55236210d5606ac868e6cc364 (patch) | |
| tree | 9cdc6d88fa8510b86aee531b2ee129840031b927 /arch/arc | |
| parent | ARC: cmpxchg/xchg: rewrite as macros to make type safe (diff) | |
| download | linux-ddc348c44d82d0b55236210d5606ac868e6cc364.tar.xz linux-ddc348c44d82d0b55236210d5606ac868e6cc364.zip | |
ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only)
It only makes sense to do this for the LLSC config
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/cmpxchg.h | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h index 00deb076d6f6..e2ae0eb1ca07 100644 --- a/arch/arc/include/asm/cmpxchg.h +++ b/arch/arc/include/asm/cmpxchg.h @@ -38,7 +38,7 @@ _prev; \ }) -#define arch_cmpxchg(ptr, old, new) \ +#define arch_cmpxchg_relaxed(ptr, old, new) \ ({ \ __typeof__(ptr) _p_ = (ptr); \ __typeof__(*(ptr)) _o_ = (old); \ @@ -47,12 +47,7 @@ \ switch(sizeof((_p_))) { \ case 4: \ - /* \ - * Explicit full memory barrier needed before/after \ - */ \ - smp_mb(); \ _prev_ = __cmpxchg(_p_, _o_, _n_); \ - smp_mb(); \ break; \ default: \ BUILD_BUG(); \ @@ -108,16 +103,14 @@ _val_; /* get old value */ \ }) -#define arch_xchg(ptr, val) \ +#define arch_xchg_relaxed(ptr, val) \ ({ \ __typeof__(ptr) _p_ = (ptr); \ __typeof__(*(ptr)) _val_ = (val); \ \ switch(sizeof(*(_p_))) { \ case 4: \ - smp_mb(); \ _val_ = __xchg(_p_, _val_); \ - smp_mb(); \ break; \ default: \ BUILD_BUG(); \ |