> +#if defined(CONFIG_CMA)
You can just use #ifdef here.
> +static inline int reject_cma_pages(int nr_pinned, unsigned int gup_flags,
> + struct page **pages)
Please use two instead of one tab to indent the continuing line of
a function declaration.
> +{
> + if (unlikely(gup_flags & FOLL_LONGTERM)) {
IMHO it would be a little nicer if we could move this into the caller.
