linux-kernel - Re: [PATCH v4] reboot: allow to specify reboot mode via sysfs

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Message-ID: <20210222100325.GA14587@amd>
Date:   Mon, 22 Feb 2021 11:03:25 +0100
From:   Pavel Machek <pavel@....cz>
To:     Matteo Croce <mcroce@...ux.microsoft.com>
Cc:     linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Arnd Bergmann <arnd@...db.de>, Petr Mladek <pmladek@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>
Subject: Re: [PATCH v4] reboot: allow to specify reboot mode via sysfs

On Tue 2020-11-10 21:27:46, Matteo Croce wrote:
> From: Matteo Croce <mcroce@...rosoft.com>
> 
> The kernel cmdline reboot= option offers some sort of control
> on how the reboot is issued.
> Add handles in sysfs to allow setting these reboot options, so they
> can be changed when the system is booted, other than at boot time.

We already have a reboot syscall, do we need sysfs interface, too?


> +What:		/sys/kernel/reboot/mode
> +Date:		November 2020
> +KernelVersion:	5.11
> +Contact:	Matteo Croce <mcroce@...rosoft.com>
> +Description:	Reboot mode. Valid values are: cold warm hard soft gpio


> +What:		/sys/kernel/reboot/type
> +Date:		November 2020
> +KernelVersion:	5.11
> +Contact:	Matteo Croce <mcroce@...rosoft.com>
> +Description:	Reboot type. Valid values are: bios acpi kbd triple efi pci

what is difference between mode and type? What is difference between
cold and hard for example? WTF is gpio?

> +What:		/sys/kernel/reboot/cpu
> +Date:		November 2020
> +KernelVersion:	5.11
> +Contact:	Matteo Croce <mcroce@...rosoft.com>
> +Description:	CPU number to use to reboot.

Why should user care about this?

-- 
http://www.livejournal.com/~pavelmachek

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