Re: Setting reboot type at run time for ARM

From: Arun Ramamurthy
Date: Wed Mar 18 2015 - 16:58:47 EST

On 15-03-17 05:50 PM, Florian Fainelli wrote:
On 17/03/15 14:44, Arun Ramamurthy wrote:

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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at