linux-kernel - Re: Setting reboot type at run time for ARM

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Message-ID: <5509E70E.7060907@broadcom.com>
Date:	Wed, 18 Mar 2015 13:58:54 -0700
From:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
To:	Florian Fainelli <f.fainelli@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC:	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	"bcm-kernel-feedback-list@...adcom.com" 
	<bcm-kernel-feedback-list@...adcom.com>,
	Olof Johansson <olof@...om.net>,
	Anatol Pomazau <anatol@...gle.com>,
	Dmitry Torokhov <dtor@...gle.com>
Subject: Re: Setting reboot type at run time for ARM


On 15-03-17 05:50 PM, Florian Fainelli wrote:
> On 17/03/15 14:44, Arun Ramamurthy wrote:
>> Hello
>>
>> I would like to specify a reset type just before issuing the reboot
>> command in the kernel. I know the kernel command line parameter can be
>> set as "reboot=w" to indicate warm reset but I want to be able to decide
>> this at run time before issuing a reboot command. What would be the best
>> way to implement this? Modify the reboot command
>> to accept a parameter or is there a standard hook I can use?
>
> If you use the reboot(2) system call you can already specify a large
> number of options, for options that are currently not supported by
> coreutils' reboot or busybox's reboot, you could probably provide a
> shell script wrapper which calls into either your own reboot
> implementation or the regular one, would that work?
>
Thanks Florian. After looking at the sys call documentation, i can see 
that it passes an argument to the kernel_restart function if I use 
LINUX_REBOOT_CMD_RESTART2 as the cmd. However as you mentioned the 
coreutils reboot or busybox's reboot do not support these options so I 
will write a shell script to wrap the system call.

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