Re: [PATCH] x86/reboot: Add call to do_kernel_restart()

[Borislav Petkov]

On Fri, Feb 20, 2026 at 01:29:01PM +0100, Martin Schiller wrote:
> SoC devices like the Intel / MaxLinear Lightning Mountain must be reset
> by the RCU instead of using  "normal" x86 mechanisms like ACPI, BIOS,

Read-Copy-Update?

I'm relatively sure you don't mean that.

> KBD, etc.
> 
> Therefore, the RCU driver (reset-intel-gw) registers a restart handler
> which triggers the global reset signal.
> 
> Unfortunately, this is of no use as long as the restart chain is not
> processed during reboot on x86 systems.
> 
> So we must call do_kernel_restart() when a reboot is performed. This has

Who's "we"?

> long been common practice for other architectures.
> 
> Signed-off-by: Martin Schiller <ms@xxxxxxxxxx>
> ---
>  arch/x86/kernel/reboot.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
> index 6032fa9ec753ce938b1b523a7eab76370ee802de..ddff25a1efbe71171ca22ec21f50541517c1a464 100644
> --- a/arch/x86/kernel/reboot.c
> +++ b/arch/x86/kernel/reboot.c
> @@ -773,12 +773,15 @@ static void __machine_emergency_restart(int emergency)
>  	machine_ops.emergency_restart();
>  }
>  
> -static void native_machine_restart(char *__unused)
> +static void native_machine_restart(char *command)
>  {
>  	pr_notice("machine restart\n");
>  
>  	if (!reboot_force)
>  		machine_shutdown();
> +
> +	do_kernel_restart(command);

I guess we can do that - the other arches do it already...

-- 
Regards/Gruss,
    Boris.

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