linux-kernel - Re: [PATCH RFC v1 3/3] ARM hibernation / suspend-to-disk

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Message-ID: <20140226190333.GD22839@e102568-lin.cambridge.arm.com>
Date:	Wed, 26 Feb 2014 19:03:33 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Sebastian Capella <sebastian.capella@...aro.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Len Brown <len.brown@...el.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Jonathan Austin <Jonathan.Austin@....com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	Nicolas Pitre <nico@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>,
	Russ Dill <Russ.Dill@...com>, Pavel Machek <pavel@....cz>,
	Cyril Chemparathy <cyril@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RFC v1 3/3] ARM hibernation / suspend-to-disk

On Wed, Feb 26, 2014 at 05:50:55PM +0000, Sebastian Capella wrote:
> Quoting Lorenzo Pieralisi (2014-02-26 02:24:27)
> > On Tue, Feb 25, 2014 at 05:55:31PM +0000, Sebastian Capella wrote:
> > 
> > Please add:
> > 
> > "swsusp_save() is executed in the suspend finisher so that the CPU context
> > pointer and memory are part of the saved image, which is required by the
> > resume kernel image to restart execution from swsusp_arch_suspend()"
> > 
> > >  * soft_restart is not technically needed, but is used
> > >  * to get success returned from cpu_suspend.
> > >  * After resume, the hibernation snapshot is written out.
> > 
> > "When soft reboot completes, the hibernation snapshot is written out."
> > 
> > Resume is confusing since this code is resuming twice :D on image saving
> > and on kernel image restoration.
> 
> Thanks Lorenzo!
> 
> Here's what I've got.
> 
> /*
>  * Snapshot kernel memory and reset the system.
>  *
>  * swsusp_save() is executed in the suspend finisher so that the CPU
>  * context pointer and memory are part of the saved image, which is
>  * required by the resume kernel image to restart execution from
>  * swsusp_arch_suspend().
>  *
>  * soft_restart is not technically needed, but is used to get success
>  * returned from cpu_suspend.
>  * 
>  * When soft reboot completes, the hibernation snapshot is
>  * written out.
>  */
> 
> Does this look ok?  I'll prepare a v4 patchset.

Yes it does, I will wait and review v4 then.

Thank you,
Lorenzo

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