mm: kill global variable num_physpages

Now all references to num_physpages have been removed, so kill it.

Signed-off-by: Jiang Liu <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Michel Lespinasse <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: jiangliu

include/linux/mm.h

@@ -29,7 +29,6 @@ struct writeback_control;
 extern unsigned long max_mapnr;
 #endif
 
-extern unsigned long num_physpages;
 extern unsigned long totalram_pages;
 extern void * high_memory;
 extern int page_cluster;

mm/memory.c

@@ -82,7 +82,6 @@ EXPORT_SYMBOL(max_mapnr);
 EXPORT_SYMBOL(mem_map);
 #endif
 
-unsigned long num_physpages;
 /*
  * A number of key systems in x86 including ioremap() rely on the assumption
  * that high_memory defines the upper bound on direct map memory, then end
@@ -92,7 +91,6 @@ unsigned long num_physpages;
  */
 void * high_memory;
 
-EXPORT_SYMBOL(num_physpages);
 EXPORT_SYMBOL(high_memory);
 
 /*

mm/nommu.c

@@ -56,7 +56,6 @@
 void *high_memory;
 struct page *mem_map;
 unsigned long max_mapnr;
-unsigned long num_physpages;
 unsigned long highest_memmap_pfn;
 struct percpu_counter vm_committed_as;
 int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */
@@ -85,7 +84,6 @@ unsigned long vm_memory_committed(void)
 EXPORT_SYMBOL_GPL(vm_memory_committed);
 
 EXPORT_SYMBOL(mem_map);
-EXPORT_SYMBOL(num_physpages);
 
 /* list of mapped, potentially shareable regions */
 static struct kmem_cache *vm_region_jar;