From: Pavel Machek <pavel@ucw.cz>
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
Alexander Graf <agraf@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Heiko Stuebner <heiko@sntech.de>,
LeeJon@roeck-us.net
Subject: Re: [PATCH v6 00/48] kernel: Add support for power-off handler call chain
Date: Tue, 11 Nov 2014 19:50:20 +0100 [thread overview]
Message-ID: <20141111185019.GA29452@amd> (raw)
In-Reply-To: <20141111182023.GA21970@roeck-us.net>
On Tue 2014-11-11 10:20:23, Guenter Roeck wrote:
> On Mon, Nov 10, 2014 at 09:33:48AM +0100, Pavel Machek wrote:
> > Hi!
> >
> > > Introduce a system power-off handler call chain to solve the described
> > > problems. This call chain is expected to be executed from the architecture
> > > specific machine_power_off() function. Drivers providing system power-off
> > > functionality are expected to register with this call chain. By using the
> > > priority field in the notifier block, callers can control power-off
> > > handler
> >
> > Linus rather disliked the idea of notifier chains for this... And I
> > don't see how it got addressed.
> >
> Hi all,
>
> After more thought, I concluded that it is technically impossible to support
> multiple power-off handlers without some kind of list or call chain, no matter
> how it is called. Given the opposition from Linus and the power maintainers
> to the series, I decided to shelf it.
Well, you can still do preparations -- current code directly setting
pm_power_off is ugly -- so that if you want to switch to call chain
later, it will be easy.
And if that does not happen, we still get the cleanup :-).
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2014-11-11 18:50 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-10 1:42 [PATCH v6 00/48] kernel: Add support for power-off handler call chain Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 01/48] " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 02/48] memory: emif: Use API function to determine power-off capability Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 03/48] hibernate: Call have_kernel_power_off instead of checking pm_power_off Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 04/48] m68k: Replace mach_power_off with pm_power_off Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 05/48] mfd: as3722: Drop reference to pm_power_off from devicetree bindings Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 06/48] gpio-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 07/48] qnap-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 08/48] kernel: Move pm_power_off to common code Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 09/48] mfd: palmas: Register with kernel power-off handler Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 10/48] mfd: axp20x: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 11/48] mfd: retu: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 12/48] mfd: ab8500-sysctrl: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 13/48] mfd: max8907: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 14/48] mfd: tps80031: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 15/48] mfd: dm355evm_msp: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 16/48] mfd: tps6586x: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 17/48] mfd: tps65910: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 18/48] mfd: twl4030-power: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 19/48] mfd: rk808: Register power-off handler " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 20/48] mfd: rn5t618: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 21/48] ipmi: Register " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 22/48] power/reset: restart-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 23/48] power/reset: gpio-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 24/48] power/reset: as3722-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 25/48] power/reset: qnap-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 26/48] power/reset: msm-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 27/48] power/reset: vexpress-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 28/48] power/reset: at91-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 29/48] power/reset: ltc2952-poweroff: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 30/48] x86: iris: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 31/48] x86: apm: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 32/48] x86: olpc: Register xo1 power-off handler " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 33/48] staging: nvec: Register " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 34/48] acpi: Register power-off handler " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 35/48] arm: Register " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 36/48] arm64: psci: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 37/48] avr32: atngw100: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 38/48] ia64: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 39/48] m68k: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 40/48] mips: " Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 41/48] powerpc: " Guenter Roeck
2014-11-11 7:42 ` Michael Ellerman
2014-11-11 10:42 ` Guenter Roeck
2014-11-10 1:42 ` [PATCH v6 42/48] sh: " Guenter Roeck
2014-11-10 1:43 ` [PATCH v6 43/48] x86: lguest: " Guenter Roeck
2014-11-10 1:43 ` [PATCH v6 44/48] x86: ce4100: " Guenter Roeck
2014-11-10 1:43 ` [PATCH v6 45/48] x86: intel-mid: Drop registration of dummy power-off handlers Guenter Roeck
2014-11-10 1:43 ` [PATCH v6 46/48] x86: pmc_atom: Register power-off handler with kernel power-off handler Guenter Roeck
2014-11-10 1:43 ` [PATCH v6 47/48] efi: " Guenter Roeck
2014-11-10 1:43 ` [PATCH v6 48/48] kernel: Remove pm_power_off Guenter Roeck
2014-11-10 8:33 ` [PATCH v6 00/48] kernel: Add support for power-off handler call chain Pavel Machek
2014-11-10 14:12 ` Guenter Roeck
2014-11-11 18:20 ` Guenter Roeck
2014-11-11 18:50 ` Pavel Machek [this message]
2014-11-11 19:17 ` Guenter Roeck
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