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

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Message-ID: <20160511170917.GD4329@intel.com>
Date:	Wed, 11 May 2016 20:09:17 +0300
From:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
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>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	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 08:26:58AM -0700, Arjan van de Ven wrote:
> 
> > Oh, and this was with acpi_idle. This machine already failed to
> > resume from S3 with intel_idle since forever, as detailed in
> > https://bugzilla.kernel.org/show_bug.cgi?id=107151
> > but acpi_idle worked fine until now.
> 
> can you disable (in sysfs) all C states other than C0/C1 and see if that makes it go away?
> that would point at the problem pretty clearly...

No help there it seems.

However, as a sanity check I also tested that trick on the parent commit,
and disabling ACPI C2-C3 makes that one fail as well. Disabling just C3
is OK apparently.

-- 
Ville Syrjälä
Intel OTC