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usr
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src
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linux-headers-5.4.0-113
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include
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asm-generic
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bitops
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Filename :
atomic.h
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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_GENERIC_BITOPS_ATOMIC_H_ #define _ASM_GENERIC_BITOPS_ATOMIC_H_ #include <linux/atomic.h> #include <linux/compiler.h> #include <asm/barrier.h> /* * Implementation of atomic bitops using atomic-fetch ops. * See Documentation/atomic_bitops.txt for details. */ static __always_inline void set_bit(unsigned int nr, volatile unsigned long *p) { p += BIT_WORD(nr); atomic_long_or(BIT_MASK(nr), (atomic_long_t *)p); } static __always_inline void clear_bit(unsigned int nr, volatile unsigned long *p) { p += BIT_WORD(nr); atomic_long_andnot(BIT_MASK(nr), (atomic_long_t *)p); } static __always_inline void change_bit(unsigned int nr, volatile unsigned long *p) { p += BIT_WORD(nr); atomic_long_xor(BIT_MASK(nr), (atomic_long_t *)p); } static inline int test_and_set_bit(unsigned int nr, volatile unsigned long *p) { long old; unsigned long mask = BIT_MASK(nr); p += BIT_WORD(nr); if (READ_ONCE(*p) & mask) return 1; old = atomic_long_fetch_or(mask, (atomic_long_t *)p); return !!(old & mask); } static inline int test_and_clear_bit(unsigned int nr, volatile unsigned long *p) { long old; unsigned long mask = BIT_MASK(nr); p += BIT_WORD(nr); if (!(READ_ONCE(*p) & mask)) return 0; old = atomic_long_fetch_andnot(mask, (atomic_long_t *)p); return !!(old & mask); } static inline int test_and_change_bit(unsigned int nr, volatile unsigned long *p) { long old; unsigned long mask = BIT_MASK(nr); p += BIT_WORD(nr); old = atomic_long_fetch_xor(mask, (atomic_long_t *)p); return !!(old & mask); } #endif /* _ASM_GENERIC_BITOPS_ATOMIC_H */