Commit 98d2b0eb authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

[PATCH] reduce MAX_NR_ZONES: page allocator ZONE_HIGHMEM cleanup 



page allocator ZONE_HIGHMEM fixups

1. We do not need to do an #ifdef in si_meminfo since both counters
   in use are zero if !CONFIG_HIGHMEM.

2. Add #ifdef in si_meminfo_node instead to avoid referencing zone
   information for ZONE_HIGHMEM if we do not have HIGHMEM
   (may not be there after the following patches).

3. Replace the use of ZONE_HIGHMEM with MAX_NR_ZONES in build_zonelists_node

4. build_zonelists_node: Remove BUG_ON for ZONE_HIGHMEM. Zone will
   be optional soon and thus BUG_ON cannot be triggered anymore.

5. init_free_area_core: Replace a use of ZONE_HIGHMEM with NR_MAX_ZONES.

[akpm@osdl.org: cleanups]
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c1f60a5a

mm/page_alloc.c

+7 −10
Original line number Diff line number Diff line
@@ -1199,13 +1199,8 @@ void si_meminfo(struct sysinfo *val) 
	val->sharedram = 0;

	val->freeram = nr_free_pages();

	val->bufferram = nr_blockdev_pages();

#ifdef CONFIG_HIGHMEM

	val->totalhigh = totalhigh_pages;

	val->freehigh = nr_free_highpages();

#else

	val->totalhigh = 0;

	val->freehigh = 0;

#endif

	val->mem_unit = PAGE_SIZE;

}
@@ -1218,8 +1213,13 @@ void si_meminfo_node(struct sysinfo *val, int nid) 


	val->totalram = pgdat->node_present_pages;

	val->freeram = nr_free_pages_pgdat(pgdat);

#ifdef CONFIG_HIGHMEM

	val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages;

	val->freehigh = pgdat->node_zones[ZONE_HIGHMEM].free_pages;

#else

	val->totalhigh = 0;

	val->freehigh = 0;

#endif

	val->mem_unit = PAGE_SIZE;

}

#endif
@@ -1344,14 +1344,11 @@ static int __meminit build_zonelists_node(pg_data_t *pgdat, 
{

	struct zone *zone;



	BUG_ON(zone_type > ZONE_HIGHMEM);

	BUG_ON(zone_type >= MAX_NR_ZONES);



	do {

		zone = pgdat->node_zones + zone_type;

		if (populated_zone(zone)) {

#ifndef CONFIG_HIGHMEM

			BUG_ON(zone_type > ZONE_NORMAL);

#endif

			zonelist->zones[nr_zones++] = zone;

			check_highest_zone(zone_type);

		}
@@ -1981,7 +1978,7 @@ static void __meminit free_area_init_core(struct pglist_data *pgdat, 
		if (zholes_size)

			realsize -= zholes_size[j];



		if (j < ZONE_HIGHMEM)

		if (!is_highmem_idx(j))

			nr_kernel_pages += realsize;

		nr_all_pages += realsize;

CRA Git | Maintained and supported by SUSTech CRA and CCSE