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 <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20160222221012.669411833@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index ba5043b12c3e6aacdd242bcfa2f0c5c5dae91c05..29349990e11c9cf45a7e9866c3619043b2cdbf26 100644 (file)
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -120,7 +120,7 @@ static struct perf_pmu_events_attr event_attr_##v = {                               \
 };
 
 struct rapl_pmu {
-       spinlock_t              lock;
+       raw_spinlock_t          lock;
        int                     n_active;
        struct list_head        active_list;
        struct pmu              *pmu;
@@ -210,12 +210,12 @@ 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);
 
@@ -252,9 +252,9 @@ 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)
@@ -263,7 +263,7 @@ 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)) {
@@ -288,7 +288,7 @@ 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)
@@ -297,14 +297,14 @@ 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;
 }
@@ -567,7 +567,7 @@ static int rapl_cpu_prepare(int cpu)
        pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu));
        if (!pmu)
                return -1;
-       spin_lock_init(&pmu->lock);
+       raw_spin_lock_init(&pmu->lock);
 
        INIT_LIST_HEAD(&pmu->active_list);