diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 360e71d455ccddb6a5b93cf64450d921d2f6122c..e7e8611e88633956862380d1bb19b95173b1746e 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -513,6 +513,35 @@ static inline void clear_irq_work_pending(void) "i" (offsetof(struct paca_struct, irq_work_pending))); } +void arch_irq_work_raise(void) +{ + preempt_disable(); + set_irq_work_pending_flag(); + /* + * Non-nmi code running with interrupts disabled will replay + * irq_happened before it re-enables interrupts, so setthe + * decrementer there instead of causing a hardware exception + * which would immediately hit the masked interrupt handler + * and have the net effect of setting the decrementer in + * irq_happened. + * + * NMI interrupts can not check this when they return, so the + * decrementer hardware exception is raised, which will fire + * when interrupts are next enabled. + * + * BookE does not support this yet, it must audit all NMI + * interrupt handlers to ensure they call nmi_enter() so this + * check would be correct. + */ + if (IS_ENABLED(CONFIG_BOOKE) || !irqs_disabled() || in_nmi()) { + set_dec(1); + } else { + hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_DEC; + } + preempt_enable(); +} + #else /* 32-bit */ DEFINE_PER_CPU(u8, irq_work_pending); @@ -521,8 +550,6 @@ DEFINE_PER_CPU(u8, irq_work_pending); #define test_irq_work_pending() __this_cpu_read(irq_work_pending) #define clear_irq_work_pending() __this_cpu_write(irq_work_pending, 0) -#endif /* 32 vs 64 bit */ - void arch_irq_work_raise(void) { preempt_disable(); @@ -531,6 +558,8 @@ void arch_irq_work_raise(void) preempt_enable(); } +#endif /* 32 vs 64 bit */ + #else /* CONFIG_IRQ_WORK */ #define test_irq_work_pending() 0