linux-kernel - Re: [PATCH] fix jiffy calculations in calibrate_delay

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Message-ID: <4D52E162.5030308@goop.org>
Date:	Wed, 09 Feb 2011 10:48:02 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	Jiri Slaby <jslaby@...e.cz>, Tim Deegan <Tim.Deegan@...rix.com>,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix jiffy calculations in calibrate_delay_direct	 to
 handle overflow

On 02/09/2011 05:18 AM, Jan Beulich wrote:
>>>> On 09.02.11 at 10:53, Jiri Slaby <jslaby@...e.cz> wrote:
>> On 02/09/2011 10:44 AM, Jan Beulich wrote:
>>>>>> On 09.02.11 at 10:21, Jiri Slaby <jslaby@...e.cz> wrote:
>>>> On 02/09/2011 09:31 AM, Jan Beulich wrote:
>>>>> Fixes a hang when booting as dom0 under Xen, when jiffies can be
>>>>> quite large by the time the kernel init gets this far.
>>>> As I wrote this might happen if the boot till this point takes ~ 5
>>>> minutes because we start at -5 minutes.
>>>>
>>>> That said, is this a candidate for stable? (If so, please CC stable.)
>>> Honestly, I'm not certain (given that mainline Xen Dom0 support
>>> is still only in its beginnings).
>> What about other VMs? If I run few non-kvm qemu VMs (kvm presets lpj) on
>> a busy dual-core machine, this will be a problem too, right?
> Yes, quite possible indeed.

Seems like stable material since it 1) has fixed a real bug, and 2) is
the right way to do things anyway.  It just hasn't been seen to fix a
bug in a stable kernel, so perhaps not.  If it were any more complex
then wouldn't push it.

    J
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