linux-kernel - Re: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full platforms without

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Message-ID: <20160314200033.GG2619@codeblueprint.co.uk>
Date:	Mon, 14 Mar 2016 20:00:33 +0000
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	"Chen, Yu C" <yu.c.chen@...el.com>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Mark Salter <msalter@...hat.com>
Subject: Re: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full
 platforms without _S5

On Fri, 11 Mar, at 04:33:46PM, Chen, Yu C wrote:
>
> There is  a future Base-IA platform, we are planning to skip
> implementing the SLP_TYP register and the S5 object.  (already there
> will be no S3 and no S4)
 
Cool. This is really valuable information that should go into the
commit message.

Because if this is the rationale for the change, I don't see why we'd
need to provide the default stuff. Instead we should just enforce EFI
reboot, and only add the pm_poweroff_default hook if there is an
explicit user in the future, IMO.