linux-kernel - RE: [PATCH 2/4][RFC v2] PM / sleep: Introduce arch-specific hook for disable/enable nonboot cpus

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Date:	Sun, 26 Jun 2016 01:19:10 +0000
From:	"Chen, Yu C" <yu.c.chen@...el.com>
To:	Pavel Machek <pavel@....cz>
CC:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
	Brian Gerst <brgerst@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Varun Koyyalagunta <cpudebug@...ttech.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/4][RFC v2] PM / sleep: Introduce arch-specific hook
 for disable/enable nonboot cpus


Hi,


> -----Original Message-----
> From: Pavel Machek [mailto:pavel@....cz]
> Sent: Sunday, June 26, 2016 12:52 AM
> To: Chen, Yu C
> Cc: linux-pm@...r.kernel.org; x86@...nel.org; Rafael J. Wysocki; Len Brown;
> Peter Zijlstra; H. Peter Anvin; Borislav Petkov; Brian Gerst; Thomas Gleixner;
> Ingo Molnar; Varun Koyyalagunta; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 2/4][RFC v2] PM / sleep: Introduce arch-specific hook for
> disable/enable nonboot cpus
> 
> On Sun 2016-06-26 00:18:41, Chen Yu wrote:
> > There is requirement that we need to do some arch-specific operations
> > before putting the nonboot CPUs offline/online.
> > One of the requirements comes from the hibernation resume process on
> > x86_64, we need to kick all the offlin-CPUs online and offline again,
> > in order to put them in a safe state, thus to avoid possible unwilling
> > wake up during hibernation resume.
> 
> You may want to check english here.
Ah, sorry, I'll rewrite the log, and [PATCH 4/4] might contain the detail of this issue.

thanks,
Yu