Re: [PATCH] arm64: delete dead code in this_cpu_set_vectors()

[Ard Biesheuvel]

On Wed, 19 Apr 2023 at 09:58, Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
>
> The "slot" variable is an enum, and in this context it is an unsigned
> int.  So the type means it can never be negative and also we never pass
> invalid data to this function.  If something did pass invalid data then
> this check would be insufficient protection.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>

> ---
>  arch/arm64/kernel/proton-pack.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
> index fca9cc6f5581..05f40c4e18fd 100644
> --- a/arch/arm64/kernel/proton-pack.c
> +++ b/arch/arm64/kernel/proton-pack.c
> @@ -966,9 +966,6 @@ static void this_cpu_set_vectors(enum arm64_bp_harden_el1_vectors slot)
>  {
>         const char *v = arm64_get_bp_hardening_vector(slot);
>
> -       if (slot < 0)
> -               return;
> -
>         __this_cpu_write(this_cpu_vector, v);
>
>         /*
> --
> 2.39.2
>