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Diffstat (limited to 'arch/alpha/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/alpha/include/asm/cmpxchg.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/cmpxchg.h b/arch/alpha/include/asm/cmpxchg.h new file mode 100644 index 0000000000..91d4a4d925 --- /dev/null +++ b/arch/alpha/include/asm/cmpxchg.h @@ -0,0 +1,76 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ALPHA_CMPXCHG_H +#define _ALPHA_CMPXCHG_H + +/* + * Atomic exchange routines. + */ + +#define ____xchg(type, args...) __arch_xchg ## type ## _local(args) +#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args) +#include <asm/xchg.h> + +#define xchg_local(ptr, x) \ +({ \ + __typeof__(*(ptr)) _x_ = (x); \ + (__typeof__(*(ptr))) __arch_xchg_local((ptr), (unsigned long)_x_,\ + sizeof(*(ptr))); \ +}) + +#define arch_cmpxchg_local(ptr, o, n) \ +({ \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \ + (unsigned long)_n_, \ + sizeof(*(ptr))); \ +}) + +#define arch_cmpxchg64_local(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg_local((ptr), (o), (n)); \ +}) + +#undef ____xchg +#undef ____cmpxchg +#define ____xchg(type, args...) __arch_xchg ##type(args) +#define ____cmpxchg(type, args...) __cmpxchg ##type(args) +#include <asm/xchg.h> + +/* + * The leading and the trailing memory barriers guarantee that these + * operations are fully ordered. + */ +#define arch_xchg(ptr, x) \ +({ \ + __typeof__(*(ptr)) __ret; \ + __typeof__(*(ptr)) _x_ = (x); \ + smp_mb(); \ + __ret = (__typeof__(*(ptr))) \ + __arch_xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \ + smp_mb(); \ + __ret; \ +}) + +#define arch_cmpxchg(ptr, o, n) \ +({ \ + __typeof__(*(ptr)) __ret; \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + smp_mb(); \ + __ret = (__typeof__(*(ptr))) __cmpxchg((ptr), \ + (unsigned long)_o_, (unsigned long)_n_, sizeof(*(ptr)));\ + smp_mb(); \ + __ret; \ +}) + +#define arch_cmpxchg64(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + arch_cmpxchg((ptr), (o), (n)); \ +}) + +#undef ____cmpxchg + +#endif /* _ALPHA_CMPXCHG_H */ |