[PATCH] Fix buddy list race that could lead to page lru list corruptions

[profile/ivi/kernel-x86-ivi.git] / include / linux / page-flags.h

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 9ea629c..547aac7 100644 (file)
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -74,7 +74,9 @@
 #define PG_mappedtodisk                16      /* Has blocks allocated on-disk */
 #define PG_reclaim             17      /* To be reclaimed asap */
 #define PG_nosave_free         18      /* Free, should not be written */
-#define PG_uncached            19      /* Page has been mapped as uncached */
+#define PG_buddy               19      /* Page is free, on buddy lists */
+
+#define PG_uncached            20      /* Page has been mapped as uncached */
 
 /*
  * Global page accounting.  One instance per CPU.  Only unsigned longs are
@@ -317,6 +319,10 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
 #define SetPageNosaveFree(page)        set_bit(PG_nosave_free, &(page)->flags)
 #define ClearPageNosaveFree(page)              clear_bit(PG_nosave_free, &(page)->flags)
 
+#define PageBuddy(page)                test_bit(PG_buddy, &(page)->flags)
+#define __SetPageBuddy(page)   __set_bit(PG_buddy, &(page)->flags)
+#define __ClearPageBuddy(page) __clear_bit(PG_buddy, &(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)