linux-kernel - Re: [Xen-devel] [PATCH v3] xen/smp: Use die_complete completion when taking CPU down

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Date:	Fri, 31 Oct 2014 09:36:28 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de,
	tianyu.lan@...el.com, linux-kernel@...r.kernel.org,
	david.vrabel@...rix.com, xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] [PATCH v3] xen/smp: Use die_complete completion when
 taking CPU down

On 10/31/2014 06:13 AM, Ingo Molnar wrote:
> * Boris Ostrovsky <boris.ostrovsky@...cle.com> wrote:
>
>> On 10/22/2014 01:09 PM, Boris Ostrovsky wrote:
>>> Commit 2ed53c0d6cc9 ("x86/smpboot: Speed up suspend/resume by avoiding
>>> 100ms sleep for CPU offline during S3") introduced completions to CPU
>>> offlining process. These completions are not initialized on Xen kernels
>>> causing a panic in play_dead_common().
>>>
>>> Move handling of die_complete into common routines to make them
>>> available to Xen guests.
>>>
>>> (While at it, move die_complete definition under #ifdef CONFIG_HOTPLUG_CPU)
>>>
>>> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>>> Reviewed-by: David Vrabel <david.vrabel@...rix.com>
>>> ---
>>>
>>> v3: Don't #ifdef function prototypes in smp.h
>>> v2: Keep die_complete private to smpboot.c
>>>
>>>
>>>   arch/x86/include/asm/smp.h |  1 +
>>>   arch/x86/kernel/smpboot.c  | 13 +++++++++++--
>>>   arch/x86/xen/smp.c         |  3 +++
>>>   3 files changed, 15 insertions(+), 2 deletions(-)
>>
>> Does anything else need to be done in this patch? We have CPU
>> hotplug broken currently in Xen and it would be nice to have it
>> fixed in rc3.
> There's a build warning fix that this change conflicts with:
>
>   db6a00b4bed3 x86/smpboot: Move data structure to its primary usage scope
>
> it would be nice if you could rebase it to tip:master or
> tip:x86/urgent so I can push it upstream ASAP.


Thanks Ingo. Will do.

-boris

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