diff options
Diffstat (limited to 'arch/arm/include/asm/switch_to.h')
| -rw-r--r-- | arch/arm/include/asm/switch_to.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/include/asm/switch_to.h b/arch/arm/include/asm/switch_to.h index fa09e6b49bf1..c99e259469f7 100644 --- a/arch/arm/include/asm/switch_to.h +++ b/arch/arm/include/asm/switch_to.h | |||
| @@ -4,6 +4,16 @@ | |||
| 4 | #include <linux/thread_info.h> | 4 | #include <linux/thread_info.h> |
| 5 | 5 | ||
| 6 | /* | 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 | /* | ||
| 7 | * switch_to(prev, next) should switch from task `prev' to `next' | 17 | * switch_to(prev, next) should switch from task `prev' to `next' |
| 8 | * `prev' will never be the same as `next'. schedule() itself | 18 | * `prev' will never be the same as `next'. schedule() itself |
| 9 | * contains the memory barrier to tell GCC not to cache `current'. | 19 | * contains the memory barrier to tell GCC not to cache `current'. |