Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 324 insertions, 0 deletions

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
new file mode 100644
index 000000000000..6b74fcf5bb63
--- /dev/null
+++ b/include/linux/page-flags.h
@@ -0,0 +1,324 @@
+/*
+ * Macros for manipulating and testing page->flags
+ */
+
+#ifndef PAGE_FLAGS_H
+#define PAGE_FLAGS_H
+
+#include <linux/percpu.h>
+#include <linux/cache.h>
+#include <asm/pgtable.h>
+
+/*
+ * Various page->flags bits:
+ *
+ * PG_reserved is set for special pages, which can never be swapped out. Some
+ * of them might not even exist (eg empty_bad_page)...
+ *
+ * The PG_private bitflag is set if page->private contains a valid value.
+ *
+ * During disk I/O, PG_locked is used. This bit is set before I/O and
+ * reset when I/O completes. page_waitqueue(page) is a wait queue of all tasks
+ * waiting for the I/O on this page to complete.
+ *
+ * PG_uptodate tells whether the page's contents is valid.  When a read
+ * completes, the page becomes uptodate, unless a disk I/O error happened.
+ *
+ * For choosing which pages to swap out, inode pages carry a PG_referenced bit,
+ * which is set any time the system accesses that page through the (mapping,
+ * index) hash table.  This referenced bit, together with the referenced bit
+ * in the page tables, is used to manipulate page->age and move the page across
+ * the active, inactive_dirty and inactive_clean lists.
+ *
+ * Note that the referenced bit, the page->lru list_head and the active,
+ * inactive_dirty and inactive_clean lists are protected by the
+ * zone->lru_lock, and *NOT* by the usual PG_locked bit!
+ *
+ * PG_error is set to indicate that an I/O error occurred on this page.
+ *
+ * PG_arch_1 is an architecture specific page state bit.  The generic code
+ * guarantees that this bit is cleared for a page when it first is entered into
+ * the page cache.
+ *
+ * PG_highmem pages are not permanently mapped into the kernel virtual address
+ * space, they need to be kmapped separately for doing IO on the pages.  The
+ * struct page (these bits with information) are always mapped into kernel
+ * address space...
+ */
+
+/*
+ * Don't use the *_dontuse flags.  Use the macros.  Otherwise you'll break
+ * 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
+#define PG_referenced            2
+#define PG_uptodate              3
+
+#define PG_dirty                 4
+#define PG_lru                   5
+#define PG_active                6
+#define PG_slab                  7      /* slab debug (Suparna wants this) */
+
+#define PG_highmem               8
+#define PG_checked               9      /* kill me in 2.5.<early>. */
+#define PG_arch_1               10
+#define PG_reserved             11
+
+#define PG_private              12      /* Has something at ->private */
+#define PG_writeback            13      /* Page is under writeback */
+#define PG_nosave               14      /* Used for system suspend/resume */
+#define PG_compound             15      /* Part of a compound page */
+
+#define PG_swapcache            16      /* Swap page: swp_entry_t in private */
+#define PG_mappedtodisk         17      /* Has blocks allocated on-disk */
+#define PG_reclaim              18      /* To be reclaimed asap */
+#define PG_nosave_free          19      /* Free, should not be written */
+#define PG_uncached             20      /* Page has been mapped as uncached */
+
+/*
+ * Global page accounting.  One instance per CPU.  Only unsigned longs are
+ * allowed.
+ */
+struct page_state {
+        unsigned long nr_dirty;         /* Dirty writeable pages */
+        unsigned long nr_writeback;     /* Pages under writeback */
+        unsigned long nr_unstable;      /* NFS unstable pages */
+        unsigned long nr_page_table_pages;/* Pages used for pagetables */
+        unsigned long nr_mapped;        /* mapped into pagetables */
+        unsigned long nr_slab;          /* In slab */
+#define GET_PAGE_STATE_LAST nr_slab
+
+        /*
+         * The below are zeroed by get_page_state().  Use get_full_page_state()
+         * to add up all these.
+         */
+        unsigned long pgpgin;           /* Disk reads */
+        unsigned long pgpgout;          /* Disk writes */
+        unsigned long pswpin;           /* swap reads */
+        unsigned long pswpout;          /* swap writes */
+        unsigned long pgalloc_high;     /* page allocations */
+
+        unsigned long pgalloc_normal;
+        unsigned long pgalloc_dma;
+        unsigned long pgfree;           /* page freeings */
+        unsigned long pgactivate;       /* pages moved inactive->active */
+        unsigned long pgdeactivate;     /* pages moved active->inactive */
+
+        unsigned long pgfault;          /* faults (major+minor) */
+        unsigned long pgmajfault;       /* faults (major only) */
+        unsigned long pgrefill_high;    /* inspected in refill_inactive_zone */
+        unsigned long pgrefill_normal;
+        unsigned long pgrefill_dma;
+
+        unsigned long pgsteal_high;     /* total highmem pages reclaimed */
+        unsigned long pgsteal_normal;
+        unsigned long pgsteal_dma;
+        unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
+        unsigned long pgscan_kswapd_normal;
+
+        unsigned long pgscan_kswapd_dma;
+        unsigned long pgscan_direct_high;/* total highmem pages scanned */
+        unsigned long pgscan_direct_normal;
+        unsigned long pgscan_direct_dma;
+        unsigned long pginodesteal;     /* pages reclaimed via inode freeing */
+
+        unsigned long slabs_scanned;    /* slab objects scanned */
+        unsigned long kswapd_steal;     /* pages reclaimed by kswapd */
+        unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
+        unsigned long pageoutrun;       /* kswapd's calls to page reclaim */
+        unsigned long allocstall;       /* direct reclaim calls */
+
+        unsigned long pgrotated;        /* pages rotated to tail of the LRU */
+};
+
+extern void get_page_state(struct page_state *ret);
+extern void get_full_page_state(struct page_state *ret);
+extern unsigned long __read_page_state(unsigned offset);
+extern void __mod_page_state(unsigned offset, unsigned long delta);
+
+#define read_page_state(member) \
+        __read_page_state(offsetof(struct page_state, member))
+
+#define mod_page_state(member, delta)   \
+        __mod_page_state(offsetof(struct page_state, member), (delta))
+
+#define inc_page_state(member)  mod_page_state(member, 1UL)
+#define dec_page_state(member)  mod_page_state(member, 0UL - 1)
+#define add_page_state(member,delta) mod_page_state(member, (delta))
+#define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))
+
+#define mod_page_state_zone(zone, member, delta)                                \
+        do {                                                                    \
+                unsigned offset;                                                \
+                if (is_highmem(zone))                                           \
+                        offset = offsetof(struct page_state, member##_high);    \
+                else if (is_normal(zone))                                       \
+                        offset = offsetof(struct page_state, member##_normal);  \
+                else                                                            \
+                        offset = offsetof(struct page_state, member##_dma);     \
+                __mod_page_state(offset, (delta));                              \
+        } while (0)
+
+/*
+ * Manipulation of page state flags
+ */
+#define PageLocked(page)                \
+                test_bit(PG_locked, &(page)->flags)
+#define SetPageLocked(page)             \
+                set_bit(PG_locked, &(page)->flags)
+#define TestSetPageLocked(page)         \
+                test_and_set_bit(PG_locked, &(page)->flags)
+#define ClearPageLocked(page)           \
+                clear_bit(PG_locked, &(page)->flags)
+#define TestClearPageLocked(page)       \
+                test_and_clear_bit(PG_locked, &(page)->flags)
+
+#define PageError(page)         test_bit(PG_error, &(page)->flags)
+#define SetPageError(page)      set_bit(PG_error, &(page)->flags)
+#define ClearPageError(page)    clear_bit(PG_error, &(page)->flags)
+
+#define PageReferenced(page)    test_bit(PG_referenced, &(page)->flags)
+#define SetPageReferenced(page) set_bit(PG_referenced, &(page)->flags)
+#define ClearPageReferenced(page)       clear_bit(PG_referenced, &(page)->flags)
+#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)
+
+#define PageUptodate(page)      test_bit(PG_uptodate, &(page)->flags)
+#ifndef SetPageUptodate
+#define SetPageUptodate(page)   set_bit(PG_uptodate, &(page)->flags)
+#endif
+#define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags)
+
+#define PageDirty(page)         test_bit(PG_dirty, &(page)->flags)
+#define SetPageDirty(page)      set_bit(PG_dirty, &(page)->flags)
+#define TestSetPageDirty(page)  test_and_set_bit(PG_dirty, &(page)->flags)
+#define ClearPageDirty(page)    clear_bit(PG_dirty, &(page)->flags)
+#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)
+
+#define SetPageLRU(page)        set_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 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 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)       test_bit(PG_highmem, &(page)->flags)
+#else
+#define PageHighMem(page)       0 /* needed to optimize away at compile time */
+#endif
+
+#define PageChecked(page)       test_bit(PG_checked, &(page)->flags)
+#define SetPageChecked(page)    set_bit(PG_checked, &(page)->flags)
+#define ClearPageChecked(page)  clear_bit(PG_checked, &(page)->flags)
+
+#define PageReserved(page)      test_bit(PG_reserved, &(page)->flags)
+#define SetPageReserved(page)   set_bit(PG_reserved, &(page)->flags)
+#define ClearPageReserved(page) clear_bit(PG_reserved, &(page)->flags)
+#define __ClearPageReserved(page)       __clear_bit(PG_reserved, &(page)->flags)
+
+#define SetPagePrivate(page)    set_bit(PG_private, &(page)->flags)
+#define ClearPagePrivate(page)  clear_bit(PG_private, &(page)->flags)
+#define PagePrivate(page)       test_bit(PG_private, &(page)->flags)
+#define __SetPagePrivate(page)  __set_bit(PG_private, &(page)->flags)
+#define __ClearPagePrivate(page) __clear_bit(PG_private, &(page)->flags)
+
+#define PageWriteback(page)     test_bit(PG_writeback, &(page)->flags)
+#define SetPageWriteback(page)                                          \
+        do {                                                            \
+                if (!test_and_set_bit(PG_writeback,                     \
+                                &(page)->flags))                        \
+                        inc_page_state(nr_writeback);                   \
+        } while (0)
+#define TestSetPageWriteback(page)                                      \
+        ({                                                              \
+                int ret;                                                \
+                ret = test_and_set_bit(PG_writeback,                    \
+                                        &(page)->flags);                \
+                if (!ret)                                               \
+                        inc_page_state(nr_writeback);                   \
+                ret;                                                    \
+        })
+#define ClearPageWriteback(page)                                        \
+        do {                                                            \
+                if (test_and_clear_bit(PG_writeback,                    \
+                                &(page)->flags))                        \
+                        dec_page_state(nr_writeback);                   \
+        } while (0)
+#define TestClearPageWriteback(page)                                    \
+        ({                                                              \
+                int ret;                                                \
+                ret = test_and_clear_bit(PG_writeback,                  \
+                                &(page)->flags);                        \
+                if (ret)                                                \
+                        dec_page_state(nr_writeback);                   \
+                ret;                                                    \
+        })
+
+#define PageNosave(page)        test_bit(PG_nosave, &(page)->flags)
+#define SetPageNosave(page)     set_bit(PG_nosave, &(page)->flags)
+#define TestSetPageNosave(page) test_and_set_bit(PG_nosave, &(page)->flags)
+#define ClearPageNosave(page)           clear_bit(PG_nosave, &(page)->flags)
+#define TestClearPageNosave(page)       test_and_clear_bit(PG_nosave, &(page)->flags)
+
+#define PageNosaveFree(page)    test_bit(PG_nosave_free, &(page)->flags)
+#define SetPageNosaveFree(page) set_bit(PG_nosave_free, &(page)->flags)
+#define ClearPageNosaveFree(page)               clear_bit(PG_nosave_free, &(page)->flags)
+
+#define PageMappedToDisk(page)  test_bit(PG_mappedtodisk, &(page)->flags)
+#define SetPageMappedToDisk(page) set_bit(PG_mappedtodisk, &(page)->flags)
+#define ClearPageMappedToDisk(page) clear_bit(PG_mappedtodisk, &(page)->flags)
+
+#define PageReclaim(page)       test_bit(PG_reclaim, &(page)->flags)
+#define SetPageReclaim(page)    set_bit(PG_reclaim, &(page)->flags)
+#define ClearPageReclaim(page)  clear_bit(PG_reclaim, &(page)->flags)
+#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)
+
+#ifdef CONFIG_HUGETLB_PAGE
+#define PageCompound(page)      test_bit(PG_compound, &(page)->flags)
+#else
+#define PageCompound(page)      0
+#endif
+#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)
+#define SetPageSwapCache(page)  set_bit(PG_swapcache, &(page)->flags)
+#define ClearPageSwapCache(page) clear_bit(PG_swapcache, &(page)->flags)
+#else
+#define PageSwapCache(page)     0
+#endif
+
+#define PageUncached(page)      test_bit(PG_uncached, &(page)->flags)
+#define SetPageUncached(page)   set_bit(PG_uncached, &(page)->flags)
+#define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)
+
+struct page;    /* forward declaration */
+
+int test_clear_page_dirty(struct page *page);
+int test_clear_page_writeback(struct page *page);
+int test_set_page_writeback(struct page *page);
+
+static inline void clear_page_dirty(struct page *page)
+{
+        test_clear_page_dirty(page);
+}
+
+static inline void set_page_writeback(struct page *page)
+{
+        test_set_page_writeback(page);
+}
+
+#endif  /* PAGE_FLAGS_H */