[PATCH] ia32 NUMA: physnode_map entries can be negative

Based on work from Bill Irwin <wli@holomorphy.com>

physnode_map[] needs to be signed so that pfn_to_nid() can return negative
values used to detect invalid pfn's.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/numaq.c

@@ -92,7 +92,7 @@ static void __init initialize_physnode_map(void)
 			cur = eq->hi_shrd_mem_start;
 			topofmem = eq->hi_shrd_mem_start + eq->hi_shrd_mem_size;
 			while (cur < topofmem) {
-				physnode_map[cur >> 8] = nid;
+				physnode_map[cur >> 8] = (s8) nid;
 				cur ++;
 			}
 		}

arch/i386/kernel/srat.c

@@ -193,7 +193,7 @@ static void __init initialize_physnode_map(void)
 		for (pfn = nmcp->start_pfn; pfn <= nmcp->end_pfn;
 						pfn += PAGES_PER_ELEMENT)
 		{
-			physnode_map[pfn / PAGES_PER_ELEMENT] = (int)nmcp->nid;
+			physnode_map[pfn / PAGES_PER_ELEMENT] = (s8) nmcp->nid;
 		}
 	}
 }

arch/i386/mm/discontig.c

@@ -56,7 +56,7 @@ bootmem_data_t node0_bdata;
  *     physnode_map[4-7] = 1;
  *     physnode_map[8- ] = -1;
  */
-u8 physnode_map[MAX_ELEMENTS] = { [0 ... (MAX_ELEMENTS - 1)] = -1};
+s8 physnode_map[MAX_ELEMENTS] = { [0 ... (MAX_ELEMENTS - 1)] = -1};
 
 unsigned long node_start_pfn[MAX_NUMNODES];
 unsigned long node_end_pfn[MAX_NUMNODES];

include/asm-i386/mmzone.h

@@ -37,12 +37,12 @@ extern struct pglist_data *node_data[];
 #define MAX_ELEMENTS 256
 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
 
-extern u8 physnode_map[];
+extern s8 physnode_map[];
 
 static inline int pfn_to_nid(unsigned long pfn)
 {
 #ifdef CONFIG_NUMA
-	return(physnode_map[(pfn) / PAGES_PER_ELEMENT]);
+	return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
 #else
 	return 0;
 #endif