/*
* Don't use the *_dontuse flags. Use the macros. Otherwise you'll break
- * locked- and dirty-page accounting.
- *
- * The page flags field is split into two parts, the main flags area
- * which extends from the low bits upwards, and the fields area which
- * extends from the high bits downwards.
- *
- * | FIELD | ... | FLAGS |
- * N-1 ^ 0
- * (N-FLAGS_RESERVED)
- *
- * The fields area is reserved for fields mapping zone, node and SPARSEMEM
- * section. The boundry between these two areas is defined by
- * FLAGS_RESERVED which defines the width of the fields section
- * (see linux/mmzone.h). New flags must _not_ overlap with this area.
+ * locked- and dirty-page accounting. The top eight bits of page->flags are
+ * used for page->zone, so putting flag bits there doesn't work.
*/
#define PG_locked 0 /* Page is locked. Don't touch. */
#define PG_error 1
* - The __xxx_page_state variants can be used safely when interrupts are
* disabled.
* - The __xxx_page_state variants can be used if the field is only
- * modified from process context and protected from preemption, or only
- * modified from interrupt context. In this case, the field should be
- * commented here.
+ * modified from process context, or only modified from interrupt context.
+ * In this case, the field should be commented here.
*/
struct page_state {
unsigned long nr_dirty; /* Dirty writeable pages */
#define __ClearPageDirty(page) __clear_bit(PG_dirty, &(page)->flags)
#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)
-#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags)
-#define ClearPageLRU(page) clear_bit(PG_lru, &(page)->flags)
-#define __ClearPageLRU(page) __clear_bit(PG_lru, &(page)->flags)
+#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
+#define TestSetPageLRU(page) test_and_set_bit(PG_lru, &(page)->flags)
+#define TestClearPageLRU(page) test_and_clear_bit(PG_lru, &(page)->flags)
#define PageActive(page) test_bit(PG_active, &(page)->flags)
#define SetPageActive(page) set_bit(PG_active, &(page)->flags)
#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags)
-#define __ClearPageActive(page) __clear_bit(PG_active, &(page)->flags)
+#define TestClearPageActive(page) test_and_clear_bit(PG_active, &(page)->flags)
+#define TestSetPageActive(page) test_and_set_bit(PG_active, &(page)->flags)
#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
-#define __SetPageSlab(page) __set_bit(PG_slab, &(page)->flags)
-#define __ClearPageSlab(page) __clear_bit(PG_slab, &(page)->flags)
+#define SetPageSlab(page) set_bit(PG_slab, &(page)->flags)
+#define ClearPageSlab(page) clear_bit(PG_slab, &(page)->flags)
+#define TestClearPageSlab(page) test_and_clear_bit(PG_slab, &(page)->flags)
+#define TestSetPageSlab(page) test_and_set_bit(PG_slab, &(page)->flags)
#ifdef CONFIG_HIGHMEM
#define PageHighMem(page) is_highmem(page_zone(page))
#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)
#define PageCompound(page) test_bit(PG_compound, &(page)->flags)
-#define __SetPageCompound(page) __set_bit(PG_compound, &(page)->flags)
-#define __ClearPageCompound(page) __clear_bit(PG_compound, &(page)->flags)
+#define SetPageCompound(page) set_bit(PG_compound, &(page)->flags)
+#define ClearPageCompound(page) clear_bit(PG_compound, &(page)->flags)
#ifdef CONFIG_SWAP
#define PageSwapCache(page) test_bit(PG_swapcache, &(page)->flags)