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