perf, x86: Provide means for disabling userspace RDPMC

Allow the disabling of RDPMC via a pmu specific attribute:

  echo 0 > /sys/bus/event_source/devices/cpu/rdpmc

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Arun Sharma <asharma@fb.com>
Link: http://lkml.kernel.org/n/tip-pqeog465zo5hsimtkfz73f27@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 05affc3878ff..dcd4049e92fc 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5505,6 +5505,7 @@ static int pmu_dev_alloc(struct pmu *pmu)
         if (!pmu->dev)
                 goto out;
 
+        pmu->dev->groups = pmu->attr_groups;
         device_initialize(pmu->dev);
         ret = dev_set_name(pmu->dev, "%s", pmu->name);
         if (ret)