/* SPDX-License-Identifier: GPL-2.0-or-later *//****************************************************************************** * *   Copyright © International Business Machines  Corp., 2009 * * DESCRIPTION *      GCC atomic builtin wrappers *      http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html * * AUTHOR *      Darren Hart <dvhart@linux.intel.com> * * HISTORY *      2009-Nov-17: Initial version by Darren Hart <dvhart@linux.intel.com> * *****************************************************************************/ #ifndef _ATOMIC_H#define _ATOMIC_H typedef struct {	volatile int val;} atomic_t; #define ATOMIC_INITIALIZER { 0 } /** * atomic_cmpxchg() - Atomic compare and exchange * @uaddr:	The address of the futex to be modified * @oldval:	The expected value of the futex * @newval:	The new value to try and assign the futex * * Return the old value of addr->val. */static inline intatomic_cmpxchg(atomic_t *addr, int oldval, int newval){	return __sync_val_compare_and_swap(&addr->val, oldval, newval);} /** * atomic_inc() - Atomic incrememnt * @addr:	Address of the variable to increment * * Return the new value of addr->val. */static inline intatomic_inc(atomic_t *addr){	return __sync_add_and_fetch(&addr->val, 1);} /** * atomic_dec() - Atomic decrement * @addr:	Address of the variable to decrement * * Return the new value of addr-val. */static inline intatomic_dec(atomic_t *addr){	return __sync_sub_and_fetch(&addr->val, 1);} /** * atomic_set() - Atomic set * @addr:	Address of the variable to set * @newval:	New value for the atomic_t * * Return the new value of addr->val. */static inline intatomic_set(atomic_t *addr, int newval){	addr->val = newval;	return newval;} #endif