linux-kernel - Re: [patch 2/4] x86/perf/intel/cstate: Sanitize probing

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Message-ID: <20160321144218.GW6344@twins.programming.kicks-ass.net>
Date:	Mon, 21 Mar 2016 15:42:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Borislav Petkov <bp@...e.de>,
	"Andi Kleen (ak@...ux.intel.com)" <ak@...ux.intel.com>
Subject: Re: [patch 2/4] x86/perf/intel/cstate: Sanitize probing

On Mon, Mar 21, 2016 at 02:19:27PM +0000, Liang, Kan wrote:

> > -	/* Probe the cstate events. */
> > -	for (i = 0; i < max_event_nr; i++) {
> > -		if (!msr[i].test(i) || rdmsrl_safe(msr[i].msr, &val))
> > -			msr[i].attr = NULL;
> > -	}
> 
> I think we need to update msr[i].attr as well.
> Because in cstate_pmu_event_init we still need it to do check.

Yeah, this is exploding on all sides..