On Fri, May 15, 2020 at 06:16:26AM -0700, Matthew Wilcox wrote: > From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> > > Mirroring offset_in_page(), this gives you the offset within this > particular page, no matter what size page it is. It optimises down > to offset_in_page() if CONFIG_TRANSPARENT_HUGEPAGE is not set. > > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > --- > include/linux/mm.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 088acbda722d..9a55dce6a535 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -1577,6 +1577,7 @@ static inline void clear_page_pfmemalloc(struct page *page) > extern void pagefault_out_of_memory(void); > > #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) > +#define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1)) Looks like thp_mask() would be handy here. -- Kirill A. Shutemov
