> +/* > + * Consecutive zone device pages should not be merged into the same sgl > + * or bvec segment with other types of pages or if they belong to different > + * pgmaps. Otherwise getting the pgmap of a given segment is not possible > + * without scanning the entire segment. This helper returns true either if > + * both pages are not zone device pages or both pages are zone device pages > + * with the same pgmap. > + */ > +static inline bool zone_device_pages_are_mergeable(const struct page *a, > + const struct page *b) Merging is only really a use case here. This really checks if they belong to the same pgmap, so I suspect that should be in the name.
