Looks like you don't support regions that have both huge pages and
normal pages either.
And this:
> + while (npages && (ret <= PAGE_SIZE /
> + sizeof (struct page *))) {
> + if (get_user_pages(current, current->mm,
> + cur_base, 1, 1, !write,
> + &page_list[ret], NULL) < 0)
> + goto out;
> +
> + ret++;
> + cur_base += HPAGE_SIZE;
> + npages--;
> + }
seems a little iffy as well.
As I said I think the solution is to add a little more support to the
core stuff in mm/ to make this simpler -- something like a function
like get_user_pages() except returning the page list in a struct
scatterlist so that it can return pages of different sizes would make
sense to me.
- R.
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