linux-kernel - Re: intel_pstate divide error with v3.13-rc4-256-gb7000ad

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Message-ID: <1676077.d8A9e8eo7M@vostro.rjw.lan>
Date:	Sat, 04 Jan 2014 15:38:31 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Gleb Natapov <gleb@...nel.org>,
	Dirk Brandewie <dirk.brandewie@...il.com>,
	Kashyap Chamarthy <kchamart@...hat.com>,
	Josh Boyer <jwboyer@...oraproject.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"Richard W.M. Jones" <rjones@...hat.com>
Subject: Re: intel_pstate divide error with v3.13-rc4-256-gb7000ad

On Saturday, January 04, 2014 09:35:58 AM Paolo Bonzini wrote:
> Il 03/01/2014 23:46, Rafael J. Wysocki ha scritto:
> > Well, fixing the KVM bug is surely welcome.
> > 
> > That said, adding checks to ensure that your assumptions are valid is rarely
> > wrong, especially if they are done once per kernel boot.  And the kernel only
> > should panic if it cannot continue to run, which isn't the case here.
> 
> I agree, but I suspect even your check is already late.

Well, it's just a sanity check and it makes the problem go away for the reporter.

> Your patch is welcome but perhaps it should have a WARN_ON too.

It has been pulled in already, so the WARN_ON() can only be added via a separate
patch now.  Would you like to prepare that patch?

Rafael

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