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-rw-r--r--include/linux/mm.h13
1 files changed, 9 insertions, 4 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ca973359fe5f..24659ed06bae 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -395,11 +395,11 @@ static inline void set_compound_order(struct page *page, unsigned long order)
* we have run out of space and have to fall back to an
* alternate (slower) way of determining the node.
*
- * No sparsemem: | NODE | ZONE | ... | FLAGS |
- * with space for node: | SECTION | NODE | ZONE | ... | FLAGS |
- * no space for node: | SECTION | ZONE | ... | FLAGS |
+ * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS |
+ * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
+ * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS |
*/
-#ifdef CONFIG_SPARSEMEM
+#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
#define SECTIONS_WIDTH SECTIONS_SHIFT
#else
#define SECTIONS_WIDTH 0
@@ -410,6 +410,9 @@ static inline void set_compound_order(struct page *page, unsigned long order)
#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= FLAGS_RESERVED
#define NODES_WIDTH NODES_SHIFT
#else
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+#error "Vmemmap: No space for nodes field in page flags"
+#endif
#define NODES_WIDTH 0
#endif
@@ -502,10 +505,12 @@ static inline struct zone *page_zone(struct page *page)
return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
}
+#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
static inline unsigned long page_to_section(struct page *page)
{
return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
}
+#endif
static inline void set_page_zone(struct page *page, enum zone_type zone)
{