mm: Minor clean-up of page flags in mm/page_alloc.c

Minor source code cleanup of page flags in mm/page_alloc.c.
Move the definition of the groups of bits to page-flags.h.

The purpose of this clean up is that the next patch will
conditionally add a page flag to the groups.  Doing that
in a header file is cleaner than adding #ifdefs to the
C code.

Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 31 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8e83f02cd2d3..2f552955a02f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -237,16 +237,7 @@ static void bad_page(struct page *page)
         printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n"
                 KERN_EMERG "Backtrace:\n");
         dump_stack();
-        page->flags &= ~(1 << PG_lru    |
-                        1 << PG_private |
-                        1 << PG_locked  |
-                        1 << PG_active  |
-                        1 << PG_dirty   |
-                        1 << PG_reclaim |
-                        1 << PG_slab    |
-                        1 << PG_swapcache |
-                        1 << PG_writeback |
-                        1 << PG_buddy );
+        page->flags &= ~PAGE_FLAGS_CLEAR_WHEN_BAD;
         set_page_count(page, 0);
         reset_page_mapcount(page);
         page->mapping = NULL;
@@ -463,16 +454,7 @@ static inline int free_pages_check(struct page *page)
                 (page->mapping != NULL)  |
                 (page_get_page_cgroup(page) != NULL) |
                 (page_count(page) != 0)  |
-                (page->flags & (
-                        1 << PG_lru     |
-                        1 << PG_private |
-                        1 << PG_locked  |
-                        1 << PG_active  |
-                        1 << PG_slab    |
-                        1 << PG_swapcache |
-                        1 << PG_writeback |
-                        1 << PG_reserved |
-                        1 << PG_buddy ))))
+                (page->flags & PAGE_FLAGS_CHECK_AT_FREE)))
                 bad_page(page);
         if (PageDirty(page))
                 __ClearPageDirty(page);
@@ -616,17 +598,7 @@ static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
                 (page->mapping != NULL)  |
                 (page_get_page_cgroup(page) != NULL) |
                 (page_count(page) != 0)  |
-                (page->flags & (
-                        1 << PG_lru     |
-                        1 << PG_private |
-                        1 << PG_locked  |
-                        1 << PG_active  |
-                        1 << PG_dirty   |
-                        1 << PG_slab    |
-                        1 << PG_swapcache |
-                        1 << PG_writeback |
-                        1 << PG_reserved |
-                        1 << PG_buddy ))))
+                (page->flags & PAGE_FLAGS_CHECK_AT_PREP)))
                 bad_page(page);
 
         /*