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76 lines
1.9 KiB
76 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ALPHA_CMPXCHG_H |
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#define _ALPHA_CMPXCHG_H |
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/* |
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* Atomic exchange routines. |
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*/ |
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#define ____xchg(type, args...) __xchg ## type ## _local(args) |
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#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args) |
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#include <asm/xchg.h> |
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#define xchg_local(ptr, x) \ |
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({ \ |
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__typeof__(*(ptr)) _x_ = (x); \ |
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(__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_, \ |
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sizeof(*(ptr))); \ |
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}) |
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#define arch_cmpxchg_local(ptr, o, n) \ |
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({ \ |
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__typeof__(*(ptr)) _o_ = (o); \ |
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__typeof__(*(ptr)) _n_ = (n); \ |
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(__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \ |
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(unsigned long)_n_, \ |
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sizeof(*(ptr))); \ |
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}) |
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#define arch_cmpxchg64_local(ptr, o, n) \ |
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({ \ |
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BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ |
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cmpxchg_local((ptr), (o), (n)); \ |
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}) |
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#undef ____xchg |
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#undef ____cmpxchg |
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#define ____xchg(type, args...) __xchg ##type(args) |
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#define ____cmpxchg(type, args...) __cmpxchg ##type(args) |
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#include <asm/xchg.h> |
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/* |
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* The leading and the trailing memory barriers guarantee that these |
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* operations are fully ordered. |
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*/ |
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#define arch_xchg(ptr, x) \ |
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({ \ |
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__typeof__(*(ptr)) __ret; \ |
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__typeof__(*(ptr)) _x_ = (x); \ |
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smp_mb(); \ |
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__ret = (__typeof__(*(ptr))) \ |
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__xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \ |
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smp_mb(); \ |
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__ret; \ |
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}) |
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#define arch_cmpxchg(ptr, o, n) \ |
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({ \ |
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__typeof__(*(ptr)) __ret; \ |
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__typeof__(*(ptr)) _o_ = (o); \ |
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__typeof__(*(ptr)) _n_ = (n); \ |
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smp_mb(); \ |
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__ret = (__typeof__(*(ptr))) __cmpxchg((ptr), \ |
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(unsigned long)_o_, (unsigned long)_n_, sizeof(*(ptr)));\ |
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smp_mb(); \ |
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__ret; \ |
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}) |
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#define arch_cmpxchg64(ptr, o, n) \ |
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({ \ |
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BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ |
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arch_cmpxchg((ptr), (o), (n)); \ |
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}) |
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#undef ____cmpxchg |
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#endif /* _ALPHA_CMPXCHG_H */
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