1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _ASM_MICROBLAZE_ATOMIC_H 3*4882a593Smuzhiyun #define _ASM_MICROBLAZE_ATOMIC_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <asm/cmpxchg.h> 6*4882a593Smuzhiyun #include <asm-generic/atomic.h> 7*4882a593Smuzhiyun #include <asm-generic/atomic64.h> 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * Atomically test *v and decrement if it is greater than 0. 11*4882a593Smuzhiyun * The function returns the old value of *v minus 1. 12*4882a593Smuzhiyun */ atomic_dec_if_positive(atomic_t * v)13*4882a593Smuzhiyunstatic inline int atomic_dec_if_positive(atomic_t *v) 14*4882a593Smuzhiyun { 15*4882a593Smuzhiyun unsigned long flags; 16*4882a593Smuzhiyun int res; 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun local_irq_save(flags); 19*4882a593Smuzhiyun res = v->counter - 1; 20*4882a593Smuzhiyun if (res >= 0) 21*4882a593Smuzhiyun v->counter = res; 22*4882a593Smuzhiyun local_irq_restore(flags); 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun return res; 25*4882a593Smuzhiyun } 26*4882a593Smuzhiyun #define atomic_dec_if_positive atomic_dec_if_positive 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun #endif /* _ASM_MICROBLAZE_ATOMIC_H */ 29