linux-kernel - Re: [PATCH v4 2/7] arm64: Support restart through restart notifier call chain

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Date:	Mon, 14 Jul 2014 16:07:33 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Will Deacon <Will.Deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Heiko Stuebner <heiko@...ech.de>,
	Russell King <linux@....linux.org.uk>,
	Jonas Jensen <jonas.jensen@...il.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Tomasz Figa <t.figa@...sung.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/7] arm64: Support restart through restart notifier
 call chain

On Mon, Jul 14, 2014 at 04:01:14PM +0100, Guenter Roeck wrote:
> On 07/14/2014 07:55 AM, Catalin Marinas wrote:
> > On Sun, Jul 13, 2014 at 04:30:26PM +0100, Guenter Roeck wrote:
> >> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> >> index 43b7c34..b2da6d5 100644
> >> --- a/arch/arm64/kernel/process.c
> >> +++ b/arch/arm64/kernel/process.c
> >> @@ -174,6 +174,8 @@ void machine_restart(char *cmd)
> >>   	/* Now call the architecture specific reboot code. */
> >>   	if (arm_pm_restart)
> >>   		arm_pm_restart(reboot_mode, cmd);
> >> +	else
> >> +		kernel_restart_notify(cmd);
> >
> > There are couple of drivers specific to arm64, once they are converted
> > we can get rid of arm_pm_restart entirely here.
> 
> I thought you wanted to keep exporting arm_pm_restart.

No, I just thought you don't want the restart mechanism implemented in
modules but the notifier registration still allows that, so I didn't
fully get the reasoning. But I agree on the race aspect.

> That logically implies
> that you want to have the ability to write new drivers which use it, which
> in turn implies that converting existing drivers would not make much sense.

If the new handler registration mechanism gives the functionality, I
don't see why we should keep arm_pm_restart around (for arm64 it's
easier since there aren't many drivers setting it).

-- 
Catalin
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