3.18.36-rt38-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Gleixner Upstream commit: a208749c6426 ("perf/x86/intel/rapl: Make PMU lock raw") This lock is taken in hard interrupt context even on Preempt-RT. Make it raw so RT does not have to patch it. Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Cc: Andi Kleen Cc: Arnaldo Carvalho de Melo Cc: Borislav Petkov Cc: Harish Chegondi Cc: Jacob Pan Cc: Jiri Olsa Cc: Kan Liang Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Vince Weaver Cc: linux-kernel@vger.kernel.org Cc: stable-rt@vger.kernel.org Link: http://lkml.kernel.org/r/20160222221012.669411833@linutronix.de Signed-off-by: Ingo Molnar Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Steven Rostedt --- arch/x86/kernel/cpu/perf_event_intel_rapl.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c index 611d821eac1a..f35cf3f095fe 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c +++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c @@ -104,7 +104,7 @@ static struct kobj_attribute format_attr_##_var = \ #define RAPL_CNTR_WIDTH 32 /* 32-bit rapl counters */ struct rapl_pmu { - spinlock_t lock; + raw_spinlock_t lock; int hw_unit; /* 1/2^hw_unit Joule */ int n_active; /* number of active events */ struct list_head active_list; @@ -194,13 +194,13 @@ static enum hrtimer_restart rapl_hrtimer_handle(struct hrtimer *hrtimer) if (!pmu->n_active) return HRTIMER_NORESTART; - spin_lock_irqsave(&pmu->lock, flags); + raw_spin_lock_irqsave(&pmu->lock, flags); list_for_each_entry(event, &pmu->active_list, active_entry) { rapl_event_update(event); } - spin_unlock_irqrestore(&pmu->lock, flags); + raw_spin_unlock_irqrestore(&pmu->lock, flags); hrtimer_forward_now(hrtimer, pmu->timer_interval); @@ -237,9 +237,9 @@ static void rapl_pmu_event_start(struct perf_event *event, int mode) struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu); unsigned long flags; - spin_lock_irqsave(&pmu->lock, flags); + raw_spin_lock_irqsave(&pmu->lock, flags); __rapl_pmu_event_start(pmu, event); - spin_unlock_irqrestore(&pmu->lock, flags); + raw_spin_unlock_irqrestore(&pmu->lock, flags); } static void rapl_pmu_event_stop(struct perf_event *event, int mode) @@ -248,7 +248,7 @@ static void rapl_pmu_event_stop(struct perf_event *event, int mode) struct hw_perf_event *hwc = &event->hw; unsigned long flags; - spin_lock_irqsave(&pmu->lock, flags); + raw_spin_lock_irqsave(&pmu->lock, flags); /* mark event as deactivated and stopped */ if (!(hwc->state & PERF_HES_STOPPED)) { @@ -273,7 +273,7 @@ static void rapl_pmu_event_stop(struct perf_event *event, int mode) hwc->state |= PERF_HES_UPTODATE; } - spin_unlock_irqrestore(&pmu->lock, flags); + raw_spin_unlock_irqrestore(&pmu->lock, flags); } static int rapl_pmu_event_add(struct perf_event *event, int mode) @@ -282,14 +282,14 @@ static int rapl_pmu_event_add(struct perf_event *event, int mode) struct hw_perf_event *hwc = &event->hw; unsigned long flags; - spin_lock_irqsave(&pmu->lock, flags); + raw_spin_lock_irqsave(&pmu->lock, flags); hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED; if (mode & PERF_EF_START) __rapl_pmu_event_start(pmu, event); - spin_unlock_irqrestore(&pmu->lock, flags); + raw_spin_unlock_irqrestore(&pmu->lock, flags); return 0; } @@ -551,7 +551,7 @@ static int rapl_cpu_prepare(int cpu) if (!pmu) return -1; - spin_lock_init(&pmu->lock); + raw_spin_lock_init(&pmu->lock); INIT_LIST_HEAD(&pmu->active_list); -- 2.8.1