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 */
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 */
30 static inline void prepare_sync_core_cmd(struct mm_struct *mm)
31 {
32 }
33 #endif
34
35 #endif /* _LINUX_SYNC_CORE_H */
36
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