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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef __ASM_ARM_SWITCH_TO_H
- #define __ASM_ARM_SWITCH_TO_H
- #include <linux/thread_info.h>
- #include <asm/smp_plat.h>
- /*
- * For v7 SMP cores running a preemptible kernel we may be pre-empted
- * during a TLB maintenance operation, so execute an inner-shareable dsb
- * to ensure that the maintenance completes in case we migrate to another
- * CPU.
- */
- #if defined(CONFIG_PREEMPTION) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7)
- #define __complete_pending_tlbi() dsb(ish)
- #else
- #define __complete_pending_tlbi()
- #endif
- /*
- * switch_to(prev, next) should switch from task `prev' to `next'
- * `prev' will never be the same as `next'. schedule() itself
- * contains the memory barrier to tell GCC not to cache `current'.
- */
- extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
- #define switch_to(prev,next,last) \
- do { \
- __complete_pending_tlbi(); \
- if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || is_smp()) \
- __this_cpu_write(__entry_task, next); \
- last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
- } while (0)
- #endif /* __ASM_ARM_SWITCH_TO_H */
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