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- /* SPDX-License-Identifier: GPL-2.0+ */
- #ifndef _ASM_GENERIC_ATOMIC_H
- #define _ASM_GENERIC_ATOMIC_H
- typedef struct { volatile int counter; } atomic_t;
- #if BITS_PER_LONG == 32
- typedef struct { volatile long long counter; } atomic64_t;
- #else /* BIT_PER_LONG == 32 */
- typedef struct { volatile long counter; } atomic64_t;
- #endif
- #define ATOMIC_INIT(i) { (i) }
- #define atomic_read(v) ((v)->counter)
- #define atomic_set(v, i) ((v)->counter = (i))
- #define atomic64_read(v) atomic_read(v)
- #define atomic64_set(v, i) atomic_set(v, i)
- static inline void atomic_add(int i, atomic_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter += i;
- local_irq_restore(flags);
- }
- static inline void atomic_sub(int i, atomic_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter -= i;
- local_irq_restore(flags);
- }
- static inline void atomic_inc(atomic_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- ++v->counter;
- local_irq_restore(flags);
- }
- static inline void atomic_dec(atomic_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- --v->counter;
- local_irq_restore(flags);
- }
- static inline int atomic_dec_and_test(volatile atomic_t *v)
- {
- unsigned long flags = 0;
- int val;
- local_irq_save(flags);
- val = v->counter;
- v->counter = val -= 1;
- local_irq_restore(flags);
- return val == 0;
- }
- static inline int atomic_add_negative(int i, volatile atomic_t *v)
- {
- unsigned long flags = 0;
- int val;
- local_irq_save(flags);
- val = v->counter;
- v->counter = val += i;
- local_irq_restore(flags);
- return val < 0;
- }
- static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- *addr &= ~mask;
- local_irq_restore(flags);
- }
- #if BITS_PER_LONG == 32
- static inline void atomic64_add(long long i, volatile atomic64_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter += i;
- local_irq_restore(flags);
- }
- static inline void atomic64_sub(long long i, volatile atomic64_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter -= i;
- local_irq_restore(flags);
- }
- #else /* BIT_PER_LONG == 32 */
- static inline void atomic64_add(long i, volatile atomic64_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter += i;
- local_irq_restore(flags);
- }
- static inline void atomic64_sub(long i, volatile atomic64_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter -= i;
- local_irq_restore(flags);
- }
- #endif
- static inline void atomic64_inc(volatile atomic64_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter += 1;
- local_irq_restore(flags);
- }
- static inline void atomic64_dec(volatile atomic64_t *v)
- {
- unsigned long flags = 0;
- local_irq_save(flags);
- v->counter -= 1;
- local_irq_restore(flags);
- }
- #endif
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