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

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Message-ID: <542D52AC.3040009@roeck-us.net>
Date:	Thu, 02 Oct 2014 06:27:08 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	David Vrabel <david.vrabel@...rix.com>,
	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 10/02/2014 02:45 AM, David Vrabel wrote:
> 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.
>

Good idea. I'll do that for the next version of the patch set.

Guenter


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