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charset="utf-8" The current shift value for page_type is 24. To avoid hardcode, define a macro called PAGE_TYPE_SHIFT and PAGE_TYPE_MASK. No functional change. Signed-off-by: Huan Yang --- include/linux/page-flags.h | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 4fe5ee67535b..3c7103c2eee4 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -961,9 +961,12 @@ enum pagetype { PGTY_mapcount_underflow =3D 0xff }; =20 +#define PAGE_TYPE_SHIFT 24 +#define PAGE_TYPE_MASK ((1 << PAGE_TYPE_SHIFT) - 1) + static inline bool page_type_has_type(int page_type) { - return page_type < (PGTY_mapcount_underflow << 24); + return page_type < (PGTY_mapcount_underflow << PAGE_TYPE_SHIFT); } =20 /* This takes a mapcount which is one more than page->_mapcount */ @@ -980,7 +983,8 @@ static inline bool page_has_type(const struct page *pag= e) #define FOLIO_TYPE_OPS(lname, fname) \ static __always_inline bool folio_test_##fname(const struct folio *folio) \ { \ - return data_race(folio->page.page_type >> 24) =3D=3D PGTY_##lname; \ + return data_race(folio->page.page_type >> PAGE_TYPE_SHIFT) \ + =3D=3D PGTY_##lname; \ } \ static __always_inline void __folio_set_##fname(struct folio *folio) \ { \ @@ -988,7 +992,8 @@ static __always_inline void __folio_set_##fname(struct = folio *folio) \ return; \ VM_BUG_ON_FOLIO(data_race(folio->page.page_type) !=3D UINT_MAX, \ folio); \ - folio->page.page_type =3D (unsigned int)PGTY_##lname << 24; \ + folio->page.page_type =3D (unsigned int)PGTY_##lname \ + << PAGE_TYPE_SHIFT; \ } \ static __always_inline void __folio_clear_##fname(struct folio *folio) \ { \ @@ -1002,14 +1007,16 @@ static __always_inline void __folio_clear_##fname(s= truct folio *folio) \ FOLIO_TYPE_OPS(lname, fname) \ static __always_inline int Page##uname(const struct page *page) \ { \ - return data_race(page->page_type >> 24) =3D=3D PGTY_##lname; \ + return data_race(page->page_type >> PAGE_TYPE_SHIFT) \ + =3D=3D PGTY_##lname; \ } \ static __always_inline void __SetPage##uname(struct page *page) \ { \ if (Page##uname(page)) \ return; \ VM_BUG_ON_PAGE(data_race(page->page_type) !=3D UINT_MAX, page); \ - page->page_type =3D (unsigned int)PGTY_##lname << 24; \ + page->page_type =3D (unsigned int)PGTY_##lname \ + << PAGE_TYPE_SHIFT; \ } \ static __always_inline void __ClearPage##uname(struct page *page) \ { \ --=20 2.34.1