1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SYNC_CORE_H
3 #define _LINUX_SYNC_CORE_H
4 
5 #ifdef CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
6 #include <asm/sync_core.h>
7 #else
8 /*
9  * This is a dummy sync_core_before_usermode() implementation that can be used
10  * on all architectures which return to user-space through core serializing
11  * instructions.
12  * If your architecture returns to user-space through non-core-serializing
13  * instructions, you need to write your own functions.
14  */
sync_core_before_usermode(void)15 static inline void sync_core_before_usermode(void)
16 {
17 }
18 #endif
19 
20 #ifdef CONFIG_ARCH_HAS_PREPARE_SYNC_CORE_CMD
21 #include <asm/sync_core.h>
22 #else
23 /*
24  * This is a dummy prepare_sync_core_cmd() implementation that can be used on
25  * all architectures which provide unconditional core serializing instructions
26  * in switch_mm().
27  * If your architecture doesn't provide such core serializing instructions in
28  * switch_mm(), you may need to write your own functions.
29  */
prepare_sync_core_cmd(struct mm_struct * mm)30 static inline void prepare_sync_core_cmd(struct mm_struct *mm)
31 {
32 }
33 #endif
34 
35 #endif /* _LINUX_SYNC_CORE_H */
36