On Fri, May 22, 2015 at 03:29:06PM +0200, Peter Zijlstra wrote:
> @@ -788,9 +788,9 @@ int x86_schedule_events(struct cpu_hw_ev
> x86_pmu.start_scheduling(cpuc);
>
> for (i = 0, wmin = X86_PMC_IDX_MAX, wmax = 0; i < n; i++) {
> + cpuc->event_constraint[i] = NULL;
^^^ that is new, which is esp. important in light of the
intel_get_event_constraints() hunk below, which would happily continue
life with a garbage constraint.
> c = x86_pmu.get_event_constraints(cpuc, i, cpuc->event_list[i]);
> + cpuc->event_constraint[i] = c;
>
> wmin = min(wmin, c->weight);
> wmax = max(wmax, c->weight);
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -2106,7 +2106,7 @@ static struct event_constraint *
> intel_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
> struct perf_event *event)
> {
> - struct event_constraint *c1 = event->hw.constraint;
> + struct event_constraint *c1 = cpuc->event_constraint[idx];
> struct event_constraint *c2;
>
> /*
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