linux-kernel - Re: [Xen-devel] [RFC PATCH 14/16] x86/xen: support poweroff through poweroff handler call chain

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Message-ID: <542D1EC4.10100@citrix.com>
Date:	Thu, 2 Oct 2014 10:45:40 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Guenter Roeck <linux@...ck-us.net>, <linux-kernel@...r.kernel.org>
CC:	<linux-mips@...ux-mips.org>, <linux-ia64@...r.kernel.org>,
	<linux-c6x-dev@...ux-c6x.org>, <linux-parisc@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-sh@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, <xen-devel@...ts.xenproject.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-metag@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [RFC PATCH 14/16] x86/xen: support poweroff through
 poweroff handler call chain

On 30/09/14 19:00, Guenter Roeck wrote:
> The kernel core now supports a poweroff handler call chain
> to remove power from the system. Call it if pm_power_off
> is set to NULL.
> 
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  arch/x86/xen/enlighten.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index c0cb11f..645d00f 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1322,6 +1322,8 @@ static void xen_machine_power_off(void)
>  {
>  	if (pm_power_off)
>  		pm_power_off();
> +	else
> +		do_kernel_poweroff();

Why isn't this if (pm_power_off) check in do_kernel_poweroff()?

That way when you finally remove pm_power_off you need only update one
place.  A quick skim of the other archs suggest this would work for them
too.

David
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