linux-kernel - Re: [lkp] [x86/mce] 81ffdcdd97: kmsg.CPU61:Package_temperature_above_threshold,cpu_clock_throttled(total

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Date:	Fri, 4 Dec 2015 11:48:15 +0100
From:	Borislav Petkov <bp@...e.de>
To:	kernel test robot <ying.huang@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>
Cc:	Andi Kleen <ak@...ux.intel.com>, lkp@...org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-edac <linux-edac@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [lkp] [x86/mce] 81ffdcdd97:
 kmsg.CPU61:Package_temperature_above_threshold,cpu_clock_throttled(total_events=#)

On Fri, Dec 04, 2015 at 09:20:39AM +0800, kernel test robot wrote:
> FYI, we noticed the below changes on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit 81ffdcdd97d94110627caa81c23d5d780083731d ("x86/mce: Fix thermal throttling reporting after kexec")
> 
> This may be the intended behavior, just FYI.

Should be...

Let me get this straight - before this commit, the messages don't
appear, yes?

Looking at the hunk and AFAICT, it checks APIC_LVTTHMR[VEC] and it did
bail out if something was there != 0 before.

With this check removed, we go and actually init.

So I can imagine BIOS programming stuff in it already and us not even
initializing thermal throttling due to that. And this commit actually
*fixed* it on baremetal too.

But that would be crazy, BIOS would never do something like that?!</sarcasm>

Tony?

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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