arch/arm/include/asm/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  */
  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 */