diff options
| -rw-r--r-- | arch/arm/include/asm/spinlock.h | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/switch_to.h | 10 |
2 files changed, 11 insertions, 1 deletions
diff --git a/arch/arm/include/asm/spinlock.h b/arch/arm/include/asm/spinlock.h index f8b8965..2c1e748 100644 --- a/arch/arm/include/asm/spinlock.h +++ b/arch/arm/include/asm/spinlock.h @@ -46,7 +46,7 @@ static inline void dsb_sev(void) { #if __LINUX_ARM_ARCH__ >= 7 __asm__ __volatile__ ( - "dsb\n" + "dsb ishst\n" SEV ); #else diff --git a/arch/arm/include/asm/switch_to.h b/arch/arm/include/asm/switch_to.h index fa09e6b..c99e259 100644 --- a/arch/arm/include/asm/switch_to.h +++ b/arch/arm/include/asm/switch_to.h @@ -4,6 +4,16 @@ #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'. |