linux-kernel - Re: [PATCH v4 18/25] x86: Use do_kernel_power

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Date:   Sun, 28 Nov 2021 02:15:51 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Russell King <linux@...linux.org.uk>,
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Subject: Re: [PATCH v4 18/25] x86: Use do_kernel_power_off()

On Fri, Nov 26, 2021 at 09:00:54PM +0300, Dmitry Osipenko wrote:
> Kernel now supports chained power-off handlers. Use do_kernel_power_off()
> that invokes chained power-off handlers. It also invokes legacy
> pm_power_off() for now, which will be removed once all drivers will
> be converted to the new power-off API.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  arch/x86/kernel/reboot.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
> index 0a40df66a40d..cd7d9416d81a 100644
> --- a/arch/x86/kernel/reboot.c
> +++ b/arch/x86/kernel/reboot.c
> @@ -747,10 +747,10 @@ static void native_machine_halt(void)
>  
>  static void native_machine_power_off(void)
>  {
> -	if (pm_power_off) {
> +	if (kernel_can_power_off()) {
>  		if (!reboot_force)
>  			machine_shutdown();
> -		pm_power_off();
> +		do_kernel_power_off();
>  	}

Judging from an old commit from 2006 [1], this can be rewritten as:

if (!reboot_force && kernel_can_power_off())
	machine_shutdown();
do_kernel_power_off();

And maybe later reworked so it doesn't need kernel_can_power_off().

[1] http://lkml.iu.edu/hypermail//linux/kernel/0511.3/0681.html

Best Regards
Michał Mirosław