Re: [PATCH v4 17/24] crypto: x86/poly - load based on CPU features

[Jason A. Donenfeld]

On Tue, Nov 15, 2022 at 10:13:35PM -0600, Robert Elliott wrote:
> +static const struct x86_cpu_id module_cpu_ids[] = {
> +	X86_MATCH_FEATURE(X86_FEATURE_ANY, NULL),
> +	{}
> +};
> +MODULE_DEVICE_TABLE(x86cpu, module_cpu_ids);
> +
>  static int __init poly1305_simd_mod_init(void)
>  {
> +	if (!x86_match_cpu(module_cpu_ids))
> +		return -ENODEV;

What exactly does this accomplish? Isn't this just a no-op?

Jason