Re: [PATCH] mm: don't allow empty relative nodemask in mpol_relative_nodemask()

[Matthew Wilcox]

On Thu, May 28, 2026 at 03:03:37PM -0400, Yury Norov wrote:
>  static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig,
          ^^^^

>  				   const nodemask_t *rel)
>  {
> +	unsigned int w = nodes_weight(*rel);
>  	nodemask_t tmp;
> -	nodes_fold(tmp, *orig, nodes_weight(*rel));
> +
> +	if (w == 0)
> +		return -EINVAL;

... this doesn't even compile.