[PATCH] remove valid_addr_bitmap

From: William Lee Irwin III <wli@holomorphy.com>

->valid_addr_bitmap is initialized nowhere.  Any kern_addr_valid() testing
it returns 0 unconditionally.

This patch converts kern_addr_valid() implementations using it to return 0
as per the above and removes it from structures and zone initialization.
Untested (not even compiletested), though a similar patch also nuking
d_validate() was in use in -wli for several months.

include/asm-alpha/mmzone.h

@@ -72,9 +72,8 @@ PLAT_NODE_DATA_LOCALNR(unsigned long p, int n)
     ((unsigned long)__va(NODE_DATA(kvaddr_to_nid(kaddr))->node_start_pfn  \
 			 << PAGE_SHIFT))
 
-#define kern_addr_valid(kaddr)						  \
-    test_bit(local_mapnr(kaddr), 					  \
-	     NODE_DATA(kvaddr_to_nid(kaddr))->valid_addr_bitmap)
+/* XXX: FIXME -- wli */
+#define kern_addr_valid(kaddr)	(0)
 
 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 

include/asm-i386/mmzone.h

@@ -62,12 +62,8 @@ extern struct pglist_data *node_data[];
 	(__pfn - node_start_pfn(pfn_to_nid(__pfn)));			\
 })
 
-#define kern_addr_valid(kaddr)						\
-({									\
-	unsigned long __kaddr = (unsigned long)(kaddr);			\
-	pg_data_t *__pgdat = NODE_DATA(kvaddr_to_nid(__kaddr));		\
-	test_bit(local_mapnr(__kaddr), __pgdat->valid_addr_bitmap);	\
-})
+/* XXX: FIXME -- wli */
+#define kern_addr_valid(kaddr)	(0)
 
 #define pfn_to_page(pfn)						\
 ({									\

include/asm-mips/mmzone.h

@@ -75,9 +75,8 @@ extern plat_pg_data_t *plat_node_data[];
 		(((unsigned long)ADDR_TO_MAPBASE((kaddr)) - PAGE_OFFSET) / \
 		sizeof(struct page))))
 
-#define kern_addr_valid(addr)	((KVADDR_TO_NID((unsigned long)addr) > \
-	-1) ? 0 : (test_bit(LOCAL_MAP_NR((addr)), \
-	NODE_DATA(KVADDR_TO_NID((unsigned long)addr))->valid_addr_bitmap)))
+/* XXX: FIXME -- wli */
+#define kern_addr_valid(addr)	(0)
 
 #define pfn_to_page(pfn)	(mem_map + (pfn))
 #define page_to_pfn(page) \

include/asm-ppc64/mmzone.h

@@ -72,11 +72,8 @@ static inline int pa_to_nid(unsigned long pa)
 #define local_mapnr(kvaddr) \
 	( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) 
 
-#if 0
-/* XXX fix - Anton */
-#define kern_addr_valid(kaddr)	test_bit(local_mapnr(kaddr), \
-		 NODE_DATA(kvaddr_to_nid(kaddr))->valid_addr_bitmap)
-#endif
+/* XXX fix - Anton - and wli */
+#define kern_addr_valid(kaddr)	(0)
 
 /* Written this way to avoid evaluating arguments twice */
 #define discontigmem_pfn_to_page(pfn) \

include/linux/mmzone.h

@@ -205,7 +205,6 @@ typedef struct pglist_data {
 	struct zonelist node_zonelists[MAX_NR_ZONES];
 	int nr_zones;
 	struct page *node_mem_map;
-	unsigned long *valid_addr_bitmap;
 	struct bootmem_data *bdata;
 	unsigned long node_start_pfn;
 	unsigned long node_present_pages; /* total number of physical pages */

mm/page_alloc.c

@@ -1182,24 +1182,6 @@ static void __init calculate_zone_totalpages(struct pglist_data *pgdat,
 	printk("On node %d totalpages: %lu\n", pgdat->node_id, realtotalpages);
 }
 
-/*
- * Get space for the valid bitmap.
- */
-static void __init calculate_zone_bitmap(struct pglist_data *pgdat,
-		unsigned long *zones_size)
-{
-	unsigned long size = 0;
-	int i;
-
-	for (i = 0; i < MAX_NR_ZONES; i++)
-		size += zones_size[i];
-	size = LONG_ALIGN((size + 7) >> 3);
-	if (size) {
-		pgdat->valid_addr_bitmap = 
-			(unsigned long *)alloc_bootmem_node(pgdat, size);
-		memset(pgdat->valid_addr_bitmap, 0, size);
-	}
-}
 
 /*
  * Initially all pages are reserved - free ones are freed
@@ -1393,8 +1375,6 @@ void __init free_area_init_node(int nid, struct pglist_data *pgdat,
 
 	free_area_init_core(pgdat, zones_size, zholes_size);
 	memblk_set_online(node_to_memblk(nid));
-
-	calculate_zone_bitmap(pgdat, zones_size);
 }
 
 #ifndef CONFIG_DISCONTIGMEM