include/asm/barrier.h

1 /* SPDX-License-Identifier: GPL-2.0 */
21  * r: read
69  * sync:        completion barrier, all sync.xx instructions
71  *              made by ld/st instructions before sync.s
72  * sync.s:      inherit from sync, but also shareable to other cores
73  * sync.i:      inherit from sync, but also flush cpu pipeline
74  * sync.is:     the same with sync.i + sync.s
76 #define mb()		asm volatile ("sync\n":::"memory")
80  * Using three sync.is to prevent speculative PTW
82 #define sync_is()	asm volatile ("sync.is\nsync.is\nsync.is\n":::"memory")
85 #include <asm-generic/barrier.h>