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Message-ID: <20130704095735.GL18898@dyad.programming.kicks-ass.net>
Date:	Thu, 4 Jul 2013 11:57:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, eranian@...gle.com,
	andi@...stfloor.org
Subject: Re: [PATCH v2 4/7] perf, x86: Save/resotre LBR stack during context
 switch

On Mon, Jul 01, 2013 at 03:23:04PM +0800, Yan, Zheng wrote:
> +++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
> @@ -185,6 +185,13 @@ void intel_pmu_lbr_reset(void)
>  		intel_pmu_lbr_reset_32();
>  	else
>  		intel_pmu_lbr_reset_64();
> +
> +	wrmsrl(x86_pmu.lbr_tos, 0);
> +}

I double checked; my SDM Jun 2013, Vol 3C 35-93 very explicitly states that
MSR_LASTBRANCH_TOS is a read-only MSR. And afaicr all previous times I checked
this it did say this too.
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