linux-kernel - Re: [PATCH] perf, x86: Disable perf if the BIOS got its grubby paws on the PMU

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Message-ID: <4C80FDF7.1080106@linux.intel.com>
Date:	Fri, 03 Sep 2010 06:53:59 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, Stephane Eranian <eranian@...gle.com>,
	"robert.richter" <robert.richter@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.kernel.org>
Subject: Re: [PATCH] perf, x86: Disable perf if the BIOS got its grubby paws
 on the PMU

On 9/3/2010 2:13 AM, Peter Zijlstra wrote:
>
> +static void print_BIOS_fail(void)
> +{
> +	printk(KERN_ERR "\n");
> +	printk(KERN_ERR "=============================================\n");
> +	printk(KERN_ERR "It appears the BIOS is actively using the PMU\n");
> +	printk(KERN_ERR "this avoids Linux from using it, please de-  \n");
> +	printk(KERN_ERR "activate this BIOS feature or request a BIOS \n");
> +	printk(KERN_ERR "update from your vendor.                     \n");
> +	printk(KERN_ERR "=============================================\n");
> +
> +	memset(&x86_pmu, 0, sizeof(x86_pmu));
> +}
> +
>    


tell us how you really feel :-)

do you want to add a phone number of the support line of the vendor 
(based on DMI data of course) ?

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