Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS

[Marco Elver]

On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@xxxxxxxxx wrote:
> From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
[...]
> +static inline bool should_skip_init(gfp_t flags)
> +{
> +	/* Don't skip if a software KASAN mode is enabled. */
> +	if (IS_ENABLED(CONFIG_KASAN_GENERIC) ||
> +	    IS_ENABLED(CONFIG_KASAN_SW_TAGS))
> +		return false;
> +
> +	/* Don't skip, if hardware tag-based KASAN is not enabled. */
> +	if (!kasan_hw_tags_enabled())
> +		return false;

Why is the IS_ENABLED(CONFIG_KASAN_{GENERIC,SW_TAGS}) check above
required? Isn't kasan_hw_tags_enabled() always false if one of those is
configured?