Commit 9023cb7e authored by Andy Whitcroft's avatar Andy Whitcroft Committed by Linus Torvalds
Browse files

slob: record page flag overlays explicitly

SLOB reuses two page bits for internal purposes, it overlays PG_active and
PG_private.  This is hidden away in slob.c.  Document these overlays
explicitly in the main page-flags enum along with all the others.
Signed-off-by: default avatarAndy Whitcroft <>
Cc: Pekka Enberg <>
Cc: Christoph Lameter <>
Cc: Matt Mackall <>
Cc: Nick Piggin <>
Reviewed-by: default avatarKOSAKI Motohiro <>
Cc: KOSAKI Motohiro <>
Cc: Rik van Riel <>
Cc: Jeremy Fitzhardinge <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 8a38082d
......@@ -105,6 +105,10 @@ enum pageflags {
PG_pinned = PG_owner_priv_1,
PG_savepinned = PG_dirty,
/* SLOB */
PG_slob_page = PG_active,
PG_slob_free = PG_private,
/* SLUB */
PG_slub_frozen = PG_active,
PG_slub_debug = PG_error,
......@@ -173,6 +177,9 @@ PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private)
__SETPAGEFLAG(Private, private)
__PAGEFLAG(SlobPage, slob_page)
__PAGEFLAG(SlobFree, slob_free)
__PAGEFLAG(SlubFrozen, slub_frozen)
__PAGEFLAG(SlubDebug, slub_debug)
......@@ -130,17 +130,17 @@ static LIST_HEAD(free_slob_large);
static inline int slob_page(struct slob_page *sp)
return test_bit(PG_active, &sp->flags);
return PageSlobPage((struct page *)sp);
static inline void set_slob_page(struct slob_page *sp)
__set_bit(PG_active, &sp->flags);
__SetPageSlobPage((struct page *)sp);
static inline void clear_slob_page(struct slob_page *sp)
__clear_bit(PG_active, &sp->flags);
__ClearPageSlobPage((struct page *)sp);
......@@ -148,19 +148,19 @@ static inline void clear_slob_page(struct slob_page *sp)
static inline int slob_page_free(struct slob_page *sp)
return test_bit(PG_private, &sp->flags);
return PageSlobFree((struct page *)sp);
static void set_slob_page_free(struct slob_page *sp, struct list_head *list)
list_add(&sp->list, list);
__set_bit(PG_private, &sp->flags);
__SetPageSlobFree((struct page *)sp);
static inline void clear_slob_page_free(struct slob_page *sp)
__clear_bit(PG_private, &sp->flags);
__ClearPageSlobFree((struct page *)sp);
#define SLOB_UNIT sizeof(slob_t)
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