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- #include <linux/export.h>
- #include <linux/spinlock.h>
- #include <linux/atomic.h>
- int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
- {
-
- if (atomic_add_unless(atomic, -1, 1))
- return 0;
-
- spin_lock(lock);
- if (atomic_dec_and_test(atomic))
- return 1;
- spin_unlock(lock);
- return 0;
- }
- EXPORT_SYMBOL(_atomic_dec_and_lock);
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