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>
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@ -6229,18 +6229,18 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
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for (j = 0; j < MAX_NR_ZONES; j++) {
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struct zone *zone = pgdat->node_zones + j;
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unsigned long size, realsize, freesize, memmap_pages;
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unsigned long size, freesize, memmap_pages;
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unsigned long zone_start_pfn = zone->zone_start_pfn;
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size = zone->spanned_pages;
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realsize = freesize = zone->present_pages;
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freesize = zone->present_pages;
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/*
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* Adjust freesize so that it accounts for how much memory
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* is used by this zone for memmap. This affects the watermark
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* and per-cpu initialisations
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*/
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memmap_pages = calc_memmap_size(size, realsize);
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memmap_pages = calc_memmap_size(size, freesize);
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if (!is_highmem_idx(j)) {
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if (freesize >= memmap_pages) {
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freesize -= memmap_pages;
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@ -6272,7 +6272,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
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* when the bootmem allocator frees pages into the buddy system.
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* And all highmem pages will be managed by the buddy system.
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*/
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zone->managed_pages = is_highmem_idx(j) ? realsize : freesize;
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zone->managed_pages = freesize;
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#ifdef CONFIG_NUMA
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zone->node = nid;
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#endif
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