[PATCH] numa node ids are int, page_to_nid and zone_to_nid should return int

NUMA node ids are passed as either int or unsigned int almost exclusivly
page_to_nid and zone_to_nid both return unsigned long.  This is a throw
back to when page_to_nid was a #define and was thus exposing the real type
of the page flags field.

In addition to fixing up the definitions of page_to_nid and zone_to_nid I
audited the users of these functions identifying the following incorrect
uses:

1) mm/page_alloc.c show_node() -- printk dumping the node id,
2) include/asm-ia64/pgalloc.h pgtable_quicklist_free() -- comparison
   against numa_node_id() which returns an int from cpu_to_node(), and
3) mm/mpolicy.c check_pte_range -- used as an index in node_isset which
   uses bit_set which in generic code takes an int.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 4 insertions, 4 deletions

diff --git a/include/asm-ia64/pgalloc.h b/include/asm-ia64/pgalloc.h
index 9cb68e9b377e..393e04c42a2c 100644
--- a/include/asm-ia64/pgalloc.h
+++ b/include/asm-ia64/pgalloc.h
@@ -60,7 +60,7 @@ static inline void *pgtable_quicklist_alloc(void)
 static inline void pgtable_quicklist_free(void *pgtable_entry)
 {
 #ifdef CONFIG_NUMA
-        unsigned long nid = page_to_nid(virt_to_page(pgtable_entry));
+        int nid = page_to_nid(virt_to_page(pgtable_entry));
 
         if (unlikely(nid != numa_node_id())) {
                 free_page((unsigned long)pgtable_entry);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 840303769c11..0e266fe1b4c4 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -456,7 +456,7 @@ static inline int page_zone_id(struct page *page)
         return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
 }
 
-static inline unsigned long zone_to_nid(struct zone *zone)
+static inline int zone_to_nid(struct zone *zone)
 {
 #ifdef CONFIG_NUMA
         return zone->node;
@@ -466,9 +466,9 @@ static inline unsigned long zone_to_nid(struct zone *zone)
 }
 
 #ifdef NODE_NOT_IN_PAGE_FLAGS
-extern unsigned long page_to_nid(struct page *page);
+extern int page_to_nid(struct page *page);
 #else
-static inline unsigned long page_to_nid(struct page *page)
+static inline int page_to_nid(struct page *page)
 {
         return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
 }