xref: /linux/arch/riscv/include/asm/sync_core.h (revision 71dfa617ea9f18e4585fe78364217cd32b1fc382)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_RISCV_SYNC_CORE_H
3 #define _ASM_RISCV_SYNC_CORE_H
4 
5 /*
6  * RISC-V implements return to user-space through an xRET instruction,
7  * which is not core serializing.
8  */
9 static inline void sync_core_before_usermode(void)
10 {
11 	asm volatile ("fence.i" ::: "memory");
12 }
13 
14 #ifdef CONFIG_SMP
15 /*
16  * Ensure the next switch_mm() on every CPU issues a core serializing
17  * instruction for the given @mm.
18  */
19 static inline void prepare_sync_core_cmd(struct mm_struct *mm)
20 {
21 	cpumask_setall(&mm->context.icache_stale_mask);
22 }
23 #else
24 static inline void prepare_sync_core_cmd(struct mm_struct *mm)
25 {
26 }
27 #endif /* CONFIG_SMP */
28 
29 #endif /* _ASM_RISCV_SYNC_CORE_H */
30