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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: Andy Whitcroft <apw@shadowen.org> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Matt Mackall <mpm@selenic.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Rik van Riel <riel@redhat.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -105,6 +105,10 @@ enum pageflags {
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PG_pinned = PG_owner_priv_1,
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PG_pinned = PG_owner_priv_1,
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PG_savepinned = PG_dirty,
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PG_savepinned = PG_dirty,
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/* SLOB */
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PG_slob_page = PG_active,
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PG_slob_free = PG_private,
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/* SLUB */
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/* SLUB */
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PG_slub_frozen = PG_active,
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PG_slub_frozen = PG_active,
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PG_slub_debug = PG_error,
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PG_slub_debug = PG_error,
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@ -173,6 +177,9 @@ PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
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PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private)
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PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private)
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__SETPAGEFLAG(Private, private)
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__SETPAGEFLAG(Private, private)
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__PAGEFLAG(SlobPage, slob_page)
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__PAGEFLAG(SlobFree, slob_free)
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__PAGEFLAG(SlubFrozen, slub_frozen)
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__PAGEFLAG(SlubFrozen, slub_frozen)
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__PAGEFLAG(SlubDebug, slub_debug)
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__PAGEFLAG(SlubDebug, slub_debug)
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12
mm/slob.c
12
mm/slob.c
@ -130,17 +130,17 @@ static LIST_HEAD(free_slob_large);
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*/
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*/
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static inline int slob_page(struct slob_page *sp)
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static inline int slob_page(struct slob_page *sp)
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{
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{
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return test_bit(PG_active, &sp->flags);
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return PageSlobPage((struct page *)sp);
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}
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}
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static inline void set_slob_page(struct slob_page *sp)
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static inline void set_slob_page(struct slob_page *sp)
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{
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{
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__set_bit(PG_active, &sp->flags);
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__SetPageSlobPage((struct page *)sp);
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}
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}
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static inline void clear_slob_page(struct slob_page *sp)
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static inline void clear_slob_page(struct slob_page *sp)
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{
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{
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__clear_bit(PG_active, &sp->flags);
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__ClearPageSlobPage((struct page *)sp);
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}
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}
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/*
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/*
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@ -148,19 +148,19 @@ static inline void clear_slob_page(struct slob_page *sp)
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*/
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*/
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static inline int slob_page_free(struct slob_page *sp)
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static inline int slob_page_free(struct slob_page *sp)
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{
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{
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return test_bit(PG_private, &sp->flags);
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return PageSlobFree((struct page *)sp);
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}
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}
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static void set_slob_page_free(struct slob_page *sp, struct list_head *list)
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static void set_slob_page_free(struct slob_page *sp, struct list_head *list)
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{
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{
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list_add(&sp->list, list);
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list_add(&sp->list, list);
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__set_bit(PG_private, &sp->flags);
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__SetPageSlobFree((struct page *)sp);
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}
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}
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static inline void clear_slob_page_free(struct slob_page *sp)
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static inline void clear_slob_page_free(struct slob_page *sp)
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{
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{
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list_del(&sp->list);
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list_del(&sp->list);
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__clear_bit(PG_private, &sp->flags);
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__ClearPageSlobFree((struct page *)sp);
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}
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}
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#define SLOB_UNIT sizeof(slob_t)
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#define SLOB_UNIT sizeof(slob_t)
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