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 11:13:37 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
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


* 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
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