From 6760bca9fd16256210f4922a3e9f067d2c7017d7 Mon Sep 17 00:00:00 2001 From: "Srivatsa S. Bhat" Date: Tue, 16 Oct 2012 13:28:10 +0530 Subject: [PATCH] perf, cpu hotplug: Run CPU_STARTING notifiers with irqs disabled The CPU_STARTING notifiers are supposed to be run with irqs disabled. But the perf_cpu_notifier() macro invokes them without doing that. Fix it. Signed-off-by: Srivatsa S. Bhat Reviewed-by: Paul E. McKenney Cc: peterz@infradead.org Cc: acme@ghostprotocols.net Link: http://lkml.kernel.org/r/20121016075809.3572.47848.stgit@srivatsabhat.in.ibm.com Signed-off-by: Ingo Molnar --- include/linux/perf_event.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 2e902359aee..06478056da0 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -803,10 +803,13 @@ static inline void perf_event_task_tick(void) { } do { \ static struct notifier_block fn##_nb __cpuinitdata = \ { .notifier_call = fn, .priority = CPU_PRI_PERF }; \ + unsigned long flags; \ fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \ (void *)(unsigned long)smp_processor_id()); \ + local_irq_save(flags); \ fn(&fn##_nb, (unsigned long)CPU_STARTING, \ (void *)(unsigned long)smp_processor_id()); \ + local_irq_restore(flags); \ fn(&fn##_nb, (unsigned long)CPU_ONLINE, \ (void *)(unsigned long)smp_processor_id()); \ register_cpu_notifier(&fn##_nb); \ -- 2.20.1