Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> So I suspect we should add that
>
> is_zero_pfn(page_to_pfn(page))
>
> as a helper inline function rather than write it out even more times
> (that "is this 'struct page' a zero page" pattern already exists in
> /proc and a few other places.
>
> is_longterm_pinnable_page() already has it, so adding it as a helper
> there in <linux/mm.h> is probably a good idea.
I just added:
static inline bool IS_ZERO_PAGE(const struct page *page)
{
return is_zero_pfn(page_to_pfn(page));
}
static inline bool IS_ZERO_FOLIO(const struct folio *folio)
{
return is_zero_pfn(page_to_pfn((const struct page *)folio));
}
to include/linux/pgtable.h. It doesn't seem I can add it to mm.h as an inline
function.
David
