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-rw-r--r--include/linux/pageblock-flags.h30
1 files changed, 24 insertions, 6 deletions
diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h
index 2ee8cd2466b..2baeee12f48 100644
--- a/include/linux/pageblock-flags.h
+++ b/include/linux/pageblock-flags.h
@@ -30,9 +30,12 @@ enum pageblock_bits {
PB_migrate,
PB_migrate_end = PB_migrate + 3 - 1,
/* 3 bits required for migrate types */
-#ifdef CONFIG_COMPACTION
PB_migrate_skip,/* If set the block is skipped by compaction */
-#endif /* CONFIG_COMPACTION */
+
+ /*
+ * Assume the bits will always align on a word. If this assumption
+ * changes then get/set pageblock needs updating.
+ */
NR_PAGEBLOCK_BITS
};
@@ -62,11 +65,26 @@ extern int pageblock_order;
/* Forward declaration */
struct page;
+unsigned long get_pfnblock_flags_mask(struct page *page,
+ unsigned long pfn,
+ unsigned long end_bitidx,
+ unsigned long mask);
+
+void set_pfnblock_flags_mask(struct page *page,
+ unsigned long flags,
+ unsigned long pfn,
+ unsigned long end_bitidx,
+ unsigned long mask);
+
/* Declarations for getting and setting flags. See mm/page_alloc.c */
-unsigned long get_pageblock_flags_group(struct page *page,
- int start_bitidx, int end_bitidx);
-void set_pageblock_flags_group(struct page *page, unsigned long flags,
- int start_bitidx, int end_bitidx);
+#define get_pageblock_flags_group(page, start_bitidx, end_bitidx) \
+ get_pfnblock_flags_mask(page, page_to_pfn(page), \
+ end_bitidx, \
+ (1 << (end_bitidx - start_bitidx + 1)) - 1)
+#define set_pageblock_flags_group(page, flags, start_bitidx, end_bitidx) \
+ set_pfnblock_flags_mask(page, flags, page_to_pfn(page), \
+ end_bitidx, \
+ (1 << (end_bitidx - start_bitidx + 1)) - 1)
#ifdef CONFIG_COMPACTION
#define get_pageblock_skip(page) \