[deliverable/linux.git] / arch / arm / include / asm / switch_to.h

#ifndef __ASM_ARM_SWITCH_TO_H
#define __ASM_ARM_SWITCH_TO_H

#include <linux/thread_info.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_PREEMPT) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7)
#define finish_arch_switch(prev)	dsb(ish)
#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 {									\
	last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));	\
} while (0)

#endif /* __ASM_ARM_SWITCH_TO_H */
Commit	Line	Data
9f97da78 DH	1	#ifndef __ASM_ARM_SWITCH_TO_H
	2	#define __ASM_ARM_SWITCH_TO_H
	3
	4	#include <linux/thread_info.h>
	5
73a6fdc4 WD	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
9f97da78 DH	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	*/
	21	extern struct task_struct __switch_to(struct task_struct , struct thread_info , struct thread_info );
	22
	23	#define switch_to(prev,next,last) \
	24	do { \
	25	last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
	26	} while (0)
	27
	28	#endif /* __ASM_ARM_SWITCH_TO_H */