linux-kernel - Re: [PATCH v2 01/11] perf,x86: Fix event/group validation

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Date:	Fri, 22 May 2015 15:40:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	mingo@...nel.org
Cc:	vincent.weaver@...ne.edu, eranian@...gle.com, jolsa@...hat.com,
	kan.liang@...el.com, linux-kernel@...r.kernel.org,
	Andrew Hunter <ahh@...gle.com>,
	Maria Dimakopoulou <maria.n.dimakopoulou@...il.com>
Subject: Re: [PATCH v2 01/11] perf,x86: Fix event/group validation

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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