| David Howells | 9f97da7 | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 1 | #ifndef __ASM_ARM_SWITCH_TO_H |
| 2 | #define __ASM_ARM_SWITCH_TO_H |
| 3 | |
| 4 | #include <linux/thread_info.h> |
| 5 | |
| 6 | /* |
| Will Deacon | 73a6fdc | 2013-05-13 11:39:50 +0100 | [diff] [blame] | 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) |
| Will Deacon | 7baa7ae | 2015-07-29 12:41:49 +0100 | [diff] [blame] | 13 | #define __complete_pending_tlbi() dsb(ish) |
| 14 | #else |
| 15 | #define __complete_pending_tlbi() |
| Will Deacon | 73a6fdc | 2013-05-13 11:39:50 +0100 | [diff] [blame] | 16 | #endif |
| 17 | |
| 18 | /* |
| David Howells | 9f97da7 | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 19 | * switch_to(prev, next) should switch from task `prev' to `next' |
| 20 | * `prev' will never be the same as `next'. schedule() itself |
| 21 | * contains the memory barrier to tell GCC not to cache `current'. |
| 22 | */ |
| 23 | extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *); |
| 24 | |
| 25 | #define switch_to(prev,next,last) \ |
| 26 | do { \ |
| Will Deacon | 7baa7ae | 2015-07-29 12:41:49 +0100 | [diff] [blame] | 27 | __complete_pending_tlbi(); \ |
| David Howells | 9f97da7 | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 28 | last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ |
| 29 | } while (0) |
| 30 | |
| 31 | #endif /* __ASM_ARM_SWITCH_TO_H */ |