[PATCH] x86: make reboot task only run on the appropriate processor

[H. Peter Anvin]

On 11/08/2013 07:14 AM, Vivek Goyal wrote:
> 
> Hi Bao,
> 
> This patch fixes the issue for me too. I noticed that we have generic
> function migrate_to_reboot_cpu() to achieve what we want and rest of
> the reboot paths are using it. So how about using that function. I 
> wrote the new patch below. It works for me. Can you please give it
> a try.
> 
> Thanks
> Vivek
> 

Is this path exercised for the kdump flow?  migrate_to_reboot_cpu() is
unsafe in that case.

> Index: linux-2.6/kernel/kexec.c
> ===================================================================
> --- linux-2.6.orig/kernel/kexec.c	2013-10-16 00:30:50.000000000 -0400
> +++ linux-2.6/kernel/kexec.c	2013-11-08 21:34:02.492072375 -0500
> @@ -1676,6 +1676,7 @@ int kernel_kexec(void)
>  #endif
>  	{
>  		kernel_restart_prepare(NULL);
> +		migrate_to_reboot_cpu();
>  		printk(KERN_EMERG "Starting new kernel\n");
>  		machine_shutdown();
>  	}
>