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068550631f
Decrease the probability of this internal facility to be used by driver code. Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Palmer Dabbelt <palmer@rivosinc.com> [riscv] Link: https://lore.kernel.org/r/20230118154450.73842-1-andrzej.hajda@intel.com Cc: Linus Torvalds <torvalds@linux-foundation.org>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* 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...) __arch_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))) __arch_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...) __arch_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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__arch_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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