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mm/page_alloc: remove realsize in free_area_init_core() 

Highmem's realsize always equals to freesize, so it is not necessary to
spare a variable to record this.

Link: http://lkml.kernel.org/r/20180413083859.65888-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2018-06-07 17:06:04 -07:00 committed by Linus Torvalds
parent 5d752600a8
commit e69438596b
1 changed files with 4 additions and 4 deletions
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8
mm/page_alloc.c
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@ -6229,18 +6229,18 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
for (j = 0; j < MAX_NR_ZONES; j++) { for (j = 0; j < MAX_NR_ZONES; j++) {
struct zone *zone = pgdat->node_zones + j; struct zone *zone = pgdat->node_zones + j;
unsigned long size, realsize, freesize, memmap_pages; unsigned long size, freesize, memmap_pages;
unsigned long zone_start_pfn = zone->zone_start_pfn; unsigned long zone_start_pfn = zone->zone_start_pfn;
size = zone->spanned_pages; size = zone->spanned_pages;
realsize = freesize = zone->present_pages; freesize = zone->present_pages;
/* /*
* Adjust freesize so that it accounts for how much memory * Adjust freesize so that it accounts for how much memory
* is used by this zone for memmap. This affects the watermark * is used by this zone for memmap. This affects the watermark
* and per-cpu initialisations * and per-cpu initialisations
*/ */
memmap_pages = calc_memmap_size(size, realsize); memmap_pages = calc_memmap_size(size, freesize);
if (!is_highmem_idx(j)) { if (!is_highmem_idx(j)) {
if (freesize >= memmap_pages) { if (freesize >= memmap_pages) {
freesize -= memmap_pages; freesize -= memmap_pages;
@ -6272,7 +6272,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
* when the bootmem allocator frees pages into the buddy system. * when the bootmem allocator frees pages into the buddy system.
* And all highmem pages will be managed by the buddy system. * And all highmem pages will be managed by the buddy system.
*/ */
zone->managed_pages = is_highmem_idx(j) ? realsize : freesize; zone->managed_pages = freesize;
#ifdef CONFIG_NUMA #ifdef CONFIG_NUMA
zone->node = nid; zone->node = nid;
#endif #endif