[PATCH] Move pfn_to_nid inline

Patch from William Lee Irwin

Inline and simplify pfn_to_nid - this is called heavily, it's a tiny
function, and makes a noticable difference in system time for kernel
compiles (sorry, lost the data). Is only used on NUMA machines.

Has been tested in my tree for over a month on UP, SMP, and NUMA and
compile tested against a variety of different configs.

arch/i386/kernel/i386_ksyms.c

@@ -68,7 +68,6 @@ EXPORT_SYMBOL(EISA_bus);
 EXPORT_SYMBOL(MCA_bus);
 #ifdef CONFIG_DISCONTIGMEM
 EXPORT_SYMBOL(node_data);
-EXPORT_SYMBOL(pfn_to_nid);
 #endif
 #ifdef CONFIG_X86_NUMAQ
 EXPORT_SYMBOL(xquad_portio);

arch/i386/kernel/numaq.c

@@ -27,6 +27,7 @@
 #include <linux/mm.h>
 #include <linux/bootmem.h>
 #include <linux/mmzone.h>
+#include <linux/module.h>
 #include <asm/numaq.h>
 
 /* These are needed before the pgdat's are created */
@@ -82,19 +83,7 @@ static void __init smp_dump_qct(void)
  * physnode_map[8- ] = -1;
  */
 int physnode_map[MAX_ELEMENTS] = { [0 ... (MAX_ELEMENTS - 1)] = -1};
-
-#define PFN_TO_ELEMENT(pfn) (pfn / PAGES_PER_ELEMENT)
-#define PA_TO_ELEMENT(pa) (PFN_TO_ELEMENT(pa >> PAGE_SHIFT))
-
-int pfn_to_nid(unsigned long pfn)
-{
-	int nid = physnode_map[PFN_TO_ELEMENT(pfn)];
-
-	if (nid == -1)
-		BUG(); /* address is not present */
-
-	return nid;
-}
+EXPORT_SYMBOL(physnode_map);
 
 /*
  * for each node mark the regions

include/asm-i386/numaq.h

@@ -36,10 +36,11 @@
 #define MAX_ELEMENTS 256
 #define PAGES_PER_ELEMENT (16777216/256)
 
+extern int physnode_map[];
+#define pfn_to_nid(pfn)	({ physnode_map[(pfn) / PAGES_PER_ELEMENT]; })
 #define pfn_to_pgdat(pfn) NODE_DATA(pfn_to_nid(pfn))
 #define PHYSADDR_TO_NID(pa) pfn_to_nid(pa >> PAGE_SHIFT)
 #define MAX_NUMNODES		8
-extern int pfn_to_nid(unsigned long);
 extern void get_memcfg_numaq(void);
 #define get_memcfg_numa() get_memcfg_numaq()