Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef __TOOLS_ASM_GENERIC_ATOMIC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define __TOOLS_ASM_GENERIC_ATOMIC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Atomic operations that C can't guarantee us.  Useful for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * resource counting etc..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * Excerpts obtained from the Linux kernel sources.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define ATOMIC_INIT(i)	{ (i) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * atomic_read - read atomic variable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * @v: pointer of type atomic_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * Atomically reads the value of @v.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static inline int atomic_read(const atomic_t *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	return READ_ONCE((v)->counter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * atomic_set - set atomic variable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  * @v: pointer of type atomic_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  * @i: required value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  * Atomically sets the value of @v to @i.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static inline void atomic_set(atomic_t *v, int i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)         v->counter = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  * atomic_inc - increment atomic variable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  * @v: pointer of type atomic_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)  * Atomically increments @v by 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static inline void atomic_inc(atomic_t *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	__sync_add_and_fetch(&v->counter, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)  * atomic_dec_and_test - decrement and test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)  * @v: pointer of type atomic_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)  * Atomically decrements @v by 1 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)  * returns true if the result is 0, or false for all other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)  * cases.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static inline int atomic_dec_and_test(atomic_t *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	return __sync_sub_and_fetch(&v->counter, 1) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #define cmpxchg(ptr, oldval, newval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	__sync_val_compare_and_swap(ptr, oldval, newval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static inline int atomic_cmpxchg(atomic_t *v, int oldval, int newval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	return cmpxchg(&(v)->counter, oldval, newval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */