powerpc/perf_event: Fix for power_pmu_disable()

When power_pmu_disable() removes the given event from a particular index into
cpuhw->event[], it shuffles down higher event[] entries.  But, this array is
paired with cpuhw->events[] and cpuhw->flags[] so should shuffle them
similarly.

If these arrays get out of sync, code such as power_check_constraints() will
fail.  This caused a bug where events were temporarily disabled and then failed
to be re-enabled; subsequent code tried to write_pmc() with its (disabled) idx
of 0, causing a message "oops trying to write PMC0".  This triggers this bug on
POWER7, running a miss-heavy test:

  perf record -e L1-dcache-load-misses -e L1-dcache-store-misses ./misstest

Signed-off-by: Matt Evans <matt@ozlabs.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
index 43b83c35cf54..5c14ffe51258 100644
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -791,8 +791,11 @@ static void power_pmu_disable(struct perf_event *event)
         cpuhw = &__get_cpu_var(cpu_hw_events);
         for (i = 0; i < cpuhw->n_events; ++i) {
                 if (event == cpuhw->event[i]) {
-                        while (++i < cpuhw->n_events)
+                        while (++i < cpuhw->n_events) {
                                 cpuhw->event[i-1] = cpuhw->event[i];
+                                cpuhw->events[i-1] = cpuhw->events[i];
+                                cpuhw->flags[i-1] = cpuhw->flags[i];
+                        }
                         --cpuhw->n_events;
                         ppmu->disable_pmc(event->hw.idx - 1, cpuhw->mmcr);
                         if (event->hw.idx) {