PG_active,
PG_slab,
PG_owner_priv_1, /* Owner use. If pagecache, fs may use*/
- PG_checked = PG_owner_priv_1, /* Used by some filesystems */
- PG_pinned = PG_owner_priv_1, /* Xen pinned pagetable */
PG_arch_1,
PG_reserved,
PG_private, /* If pagecache, has fs-private data */
PG_writeback, /* Page is under writeback */
+#ifdef CONFIG_PAGEFLAGS_EXTENDED
+ PG_head, /* A head page */
+ PG_tail, /* A tail page */
+#else
PG_compound, /* A compound page */
+#endif
PG_swapcache, /* Swap page: swp_entry_t in private */
PG_mappedtodisk, /* Has blocks allocated on-disk */
PG_reclaim, /* To be reclaimed asap */
- /* PG_readahead is only used for file reads; PG_reclaim is only for writes */
- PG_readahead = PG_reclaim, /* Reminder to do async read-ahead */
PG_buddy, /* Page is free, on buddy lists */
-
-#if (BITS_PER_LONG > 32)
-/*
- * 64-bit-only flags build down from bit 31
- *
- * 32 bit -------------------------------| FIELDS | FLAGS |
- * 64 bit | FIELDS | ?????? FLAGS |
- * 63 32 0
- */
- PG_uncached = 31, /* Page has been mapped as uncached */
+#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR
+ PG_uncached, /* Page has been mapped as uncached */
#endif
__NR_PAGEFLAGS
};
#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
__SETPAGEFLAG(uname, lname) __CLEARPAGEFLAG(uname, lname)
+#define PAGEFLAG_FALSE(uname) \
+static inline int Page##uname(struct page *page) \
+ { return 0; }
+
#define TESTSCFLAG(uname, lname) \
TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)
PAGEFLAG(LRU, lru) __CLEARPAGEFLAG(LRU, lru)
PAGEFLAG(Active, active) __CLEARPAGEFLAG(Active, active)
__PAGEFLAG(Slab, slab)
-PAGEFLAG(Checked, checked) /* Used by some filesystems */
-PAGEFLAG(Pinned, pinned) /* Xen pinned pagetable */
+PAGEFLAG(Checked, owner_priv_1) /* Used by some filesystems */
+PAGEFLAG(Pinned, owner_priv_1) TESTSCFLAG(Pinned, owner_priv_1) /* Xen */
PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private)
__SETPAGEFLAG(Private, private)
/* PG_readahead is only used for file reads; PG_reclaim is only for writes */
PAGEFLAG(Reclaim, reclaim) TESTCLEARFLAG(Reclaim, reclaim)
-PAGEFLAG(Readahead, readahead) /* Reminder to do async read-ahead */
+PAGEFLAG(Readahead, reclaim) /* Reminder to do async read-ahead */
#ifdef CONFIG_HIGHMEM
/*
* Must use a macro here due to header dependency issues. page_zone() is not
* available at this point.
*/
-#define PageHighMem(__p) is_highmem(page_zone(page))
+#define PageHighMem(__p) is_highmem(page_zone(__p))
#else
-static inline int PageHighMem(struct page *page)
-{
- return 0;
-}
+PAGEFLAG_FALSE(HighMem)
#endif
#ifdef CONFIG_SWAP
PAGEFLAG(SwapCache, swapcache)
#else
-static inline int PageSwapCache(struct page *page)
-{
- return 0;
-}
+PAGEFLAG_FALSE(SwapCache)
#endif
-#if (BITS_PER_LONG > 32)
+#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR
PAGEFLAG(Uncached, uncached)
+#else
+PAGEFLAG_FALSE(Uncached)
#endif
static inline int PageUptodate(struct page *page)
test_set_page_writeback(page);
}
+#ifdef CONFIG_PAGEFLAGS_EXTENDED
+/*
+ * System with lots of page flags available. This allows separate
+ * flags for PageHead() and PageTail() checks of compound pages so that bit
+ * tests can be used in performance sensitive paths. PageCompound is
+ * generally not used in hot code paths.
+ */
+__PAGEFLAG(Head, head)
+__PAGEFLAG(Tail, tail)
+
+static inline int PageCompound(struct page *page)
+{
+ return page->flags & ((1L << PG_head) | (1L << PG_tail));
+
+}
+#else
+/*
+ * Reduce page flag use as much as possible by overlapping
+ * compound page flags with the flags used for page cache pages. Possible
+ * because PageCompound is always set for compound pages and not for
+ * pages on the LRU and/or pagecache.
+ */
TESTPAGEFLAG(Compound, compound)
__PAGEFLAG(Head, compound)
page->flags &= ~PG_head_tail_mask;
}
+#endif /* !PAGEFLAGS_EXTENDED */
#endif /* !__GENERATING_BOUNDS_H */
#endif /* PAGE_FLAGS_H */