perf, x86: Use unlocked bitops

There is no concurrency on these variables, so don't use LOCK'ed ops.

As to the intel_pmu_handle_irq() status bit clean, nobody uses that so
remove it all together.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus@samba.org
Cc: eranian@google.com
Cc: robert.richter@amd.com
Cc: fweisbec@gmail.com
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
LKML-Reference: <20100304140100.240023029@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 5 insertions, 6 deletions

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 2dd704fa1299..01b166737424 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -643,7 +643,7 @@ static int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
                 if (test_bit(hwc->idx, used_mask))
                         break;
 
-                set_bit(hwc->idx, used_mask);
+                __set_bit(hwc->idx, used_mask);
                 if (assign)
                         assign[i] = hwc->idx;
         }
@@ -692,7 +692,7 @@ static int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
                         if (j == X86_PMC_IDX_MAX)
                                 break;
 
-                        set_bit(j, used_mask);
+                        __set_bit(j, used_mask);
 
                         if (assign)
                                 assign[i] = j;
@@ -842,7 +842,7 @@ void hw_perf_enable(void)
                          * clear active_mask and events[] yet it preserves
                          * idx
                          */
-                        set_bit(hwc->idx, cpuc->active_mask);
+                        __set_bit(hwc->idx, cpuc->active_mask);
                         cpuc->events[hwc->idx] = event;
 
                         x86_pmu.enable(event);
@@ -1057,7 +1057,7 @@ static void x86_pmu_stop(struct perf_event *event)
          * Must be done before we disable, otherwise the nmi handler
          * could reenable again:
          */
-        clear_bit(idx, cpuc->active_mask);
+        __clear_bit(idx, cpuc->active_mask);
         x86_pmu.disable(event);
 
         /*
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index 014528ba7d57..573458f1caf2 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -287,7 +287,7 @@ static struct amd_nb *amd_alloc_nb(int cpu, int nb_id)
          * initialize all possible NB constraints
          */
         for (i = 0; i < x86_pmu.num_events; i++) {
-                set_bit(i, nb->event_constraints[i].idxmsk);
+                __set_bit(i, nb->event_constraints[i].idxmsk);
                 nb->event_constraints[i].weight = 1;
         }
         return nb;
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index a84094897799..d87421c3f55b 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -765,7 +765,6 @@ again:
         for_each_set_bit(bit, (unsigned long *)&status, X86_PMC_IDX_MAX) {
                 struct perf_event *event = cpuc->events[bit];
 
-                clear_bit(bit, (unsigned long *) &status);
                 if (!test_bit(bit, cpuc->active_mask))
                         continue;