Re: [PATCH 1/2] powerpc/powernv: Avoid strlen() in pnv_restart()

["Christophe Leroy (CS GROUP)" <chleroy@kernel.org>]

Le 21/07/2026 à 17:53, Thorsten Blum a écrit :
> Check only the first byte instead of scanning the entire string with
> strlen().

Well, strlen() is not going to scan the entire string, it will break at 
first 0. But I agreed calling strlen() is not worth it.

> 
> Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>

> ---
>   arch/powerpc/platforms/powernv/setup.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
> index 06ed5e2aa265..2af92e7ba4ee 100644
> --- a/arch/powerpc/platforms/powernv/setup.c
> +++ b/arch/powerpc/platforms/powernv/setup.c
> @@ -312,7 +312,7 @@ static void  __noreturn pnv_restart(char *cmd)
>   	pnv_prepare_going_down();
>   
>   	do {
> -		if (!cmd || !strlen(cmd))
> +		if (!cmd || *cmd == '\0')

Maybe !*cmd instead ?

>   			rc = opal_cec_reboot();
>   		else if (strcmp(cmd, "full") == 0)
>   			rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL);