[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>

3 files changed, 3 insertions, 3 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index fb907236bbd8..e7b69c90cfd6 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -221,7 +221,7 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
         orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
         do {
                 struct page *page;
-                unsigned int nid;
+                int nid;
 
                 if (!pte_present(*pte))
                         continue;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 86f2984f8b79..614d427854a8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1407,7 +1407,7 @@ unsigned int nr_free_pagecache_pages(void)
 static inline void show_node(struct zone *zone)
 {
         if (NUMA_BUILD)
-                printk("Node %ld ", zone_to_nid(zone));
+                printk("Node %d ", zone_to_nid(zone));
 }
 
 void si_meminfo(struct sysinfo *val)
diff --git a/mm/sparse.c b/mm/sparse.c
index 158d6a2a5263..ac26eb0d73cd 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -36,7 +36,7 @@ static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
 static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
 #endif
 
-unsigned long page_to_nid(struct page *page)
+int page_to_nid(struct page *page)
 {
         return section_to_node_table[page_to_section(page)];
 }