1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_ARM_SWITCH_TO_H
 3#define __ASM_ARM_SWITCH_TO_H
 4
 5#include <linux/thread_info.h>
 6#include <asm/smp_plat.h>
 7
 8/*
 9 * For v7 SMP cores running a preemptible kernel we may be pre-empted
10 * during a TLB maintenance operation, so execute an inner-shareable dsb
11 * to ensure that the maintenance completes in case we migrate to another
12 * CPU.
13 */
14#if defined(CONFIG_PREEMPTION) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7)
15#define __complete_pending_tlbi()	dsb(ish)
16#else
17#define __complete_pending_tlbi()
18#endif
19
20/*
21 * switch_to(prev, next) should switch from task `prev' to `next'
22 * `prev' will never be the same as `next'.  schedule() itself
23 * contains the memory barrier to tell GCC not to cache `current'.
24 */
25extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
26
27#define switch_to(prev,next,last)					\
28do {									\
29	__complete_pending_tlbi();					\
30	if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || is_smp())	\
31		__this_cpu_write(__entry_task, next);			\
32	last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));	\
33} while (0)
34
35#endif /* __ASM_ARM_SWITCH_TO_H */

 
 1#ifndef __ASM_ARM_SWITCH_TO_H
 2#define __ASM_ARM_SWITCH_TO_H
 3
 4#include <linux/thread_info.h>
 
 5
 6/*
 7 * For v7 SMP cores running a preemptible kernel we may be pre-empted
 8 * during a TLB maintenance operation, so execute an inner-shareable dsb
 9 * to ensure that the maintenance completes in case we migrate to another
10 * CPU.
11 */
12#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7)
13#define finish_arch_switch(prev)	dsb(ish)
 
 
14#endif
15
16/*
17 * switch_to(prev, next) should switch from task `prev' to `next'
18 * `prev' will never be the same as `next'.  schedule() itself
19 * contains the memory barrier to tell GCC not to cache `current'.
20 */
21extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
22
23#define switch_to(prev,next,last)					\
24do {									\
 
 
 
25	last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));	\
26} while (0)
27
28#endif /* __ASM_ARM_SWITCH_TO_H */