diff --git a/kernel/softirq.c b/kernel/softirq.c index ef2a7b2bf0a4..24cb1e699951 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -253,8 +253,16 @@ static inline bool lockdep_softirq_start(void) { return false; } static inline void lockdep_softirq_end(bool in_hardirq) { } #endif -#define long_softirq_pending() (local_softirq_pending() & LONG_SOFTIRQ_MASK) -#define defer_for_rt() (long_softirq_pending() && cpupri_check_rt()) +#define softirq_deferred_for_rt(pending) \ +({ \ + __u32 deferred = 0; \ + if (cpupri_check_rt()) { \ + deferred = pending & LONG_SOFTIRQ_MASK; \ + pending &= ~LONG_SOFTIRQ_MASK; \ + } \ + deferred; \ +}) + asmlinkage __visible void __softirq_entry __do_softirq(void) { unsigned long end = jiffies + MAX_SOFTIRQ_TIME; @@ -262,6 +270,7 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) int max_restart = MAX_SOFTIRQ_RESTART; struct softirq_action *h; bool in_hardirq; + __u32 deferred; __u32 pending; int softirq_bit; @@ -273,14 +282,14 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) current->flags &= ~PF_MEMALLOC; pending = local_softirq_pending(); + deferred = softirq_deferred_for_rt(pending); account_irq_enter_time(current); - __local_bh_disable_ip(_RET_IP_, SOFTIRQ_OFFSET); in_hardirq = lockdep_softirq_start(); restart: /* Reset the pending bitmask before enabling irqs */ - set_softirq_pending(0); + set_softirq_pending(deferred); __this_cpu_write(active_softirqs, pending); local_irq_enable(); @@ -317,15 +326,16 @@ restart: local_irq_disable(); pending = local_softirq_pending(); + deferred = softirq_deferred_for_rt(pending); + if (pending) { if (time_before(jiffies, end) && !need_resched() && - !defer_for_rt() && --max_restart) goto restart; - - wakeup_softirqd(); } + if (pending | deferred) + wakeup_softirqd(); lockdep_softirq_end(in_hardirq); account_irq_exit_time(current); __local_bh_enable(SOFTIRQ_OFFSET); @@ -375,7 +385,7 @@ static inline void invoke_softirq(void) if (ksoftirqd_running(local_softirq_pending())) return; - if (!force_irqthreads && !defer_for_rt()) { + if (!force_irqthreads) { #ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK /* * We can safely execute softirq on the current stack if