linux-kernel - Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu")]

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Message-ID: <20160511122116.GA4329@intel.com>
Date:	Wed, 11 May 2016 15:21:16 +0300
From:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-arch@...r.kernel.org,
	Rik van Riel <riel@...hat.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	"Srivatsa S. Bhat" <srivatsa@....edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org,
	rui.zhang@...el.com, len.brown@...el.com
Subject: Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online
 calls to hotplugged cpu")]

On Wed, May 11, 2016 at 02:11:29PM +0200, Sebastian Andrzej Siewior wrote:
> On 05/11/2016 12:19 PM, Ville Syrjälä wrote:
> > Hi,
> Hi,
> 
> > I have a Lenovo Ideapad S10-3t machine here (Atom N450, 1 core, 2 HT)
> > which fails to resume from S3 on 4.6-rc releases. I bisected it down to
> > 
> > commit 1cf4f629d9d246519a1e76c021806f2a51ddba4d
> > Author: Thomas Gleixner <tglx@...utronix.de>
> > Date:   Fri Feb 26 18:43:39 2016 +0000
> > 
> >     cpu/hotplug: Move online calls to hotplugged cpu
> > 
> > Unfortunately that won't revert cleanly, and neither does the merge
> > commit, so I was unable to see if that is the only problematic commit
> > in 4.6.
> > 
> > Any ideas?
> 
> do you have a backtrace or anything or is it just not working and you
> end up with a blank screen?

Yeah can't get anything from the machine at that point. netconsole
didn't help either, and no serial on this machine. And IIRC I've
tried ramoops on this thing in the past but unfortunately the memory
got cleared on reboot.

-- 
Ville Syrjälä
Intel OTC