diff options
Diffstat (limited to 'arch/arm64/kernel/entry-common.c')
| -rw-r--r-- | arch/arm64/kernel/entry-common.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index 1fe60578e556..08d17eb0ce13 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -122,6 +122,15 @@ asmlinkage void __sched arm64_preempt_schedule_irq(void) lockdep_assert_irqs_disabled(); /* + * DAIF.DA are cleared at the start of IRQ/FIQ handling, and when GIC + * priority masking is used the GIC irqchip driver will clear DAIF.IF + * using gic_arch_enable_irqs() for normal IRQs. If anything is set in + * DAIF we must have handled an NMI, so skip preemption. + */ + if (system_uses_irq_prio_masking() && read_sysreg(daif)) + return; + + /* * Preempting a task from an IRQ means we leave copies of PSTATE * on the stack. cpufeature's enable calls may modify PSTATE, but * resuming one of these preempted tasks would undo those changes. |