Commit a1dd268c authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

mm: use alloc_pages_exact() in alloc_large_system_hash() to avoid duplicated logic

alloc_large_system_hash() has logic for freeing pages at the end of an
excessively large power-of-two buffer that is a duplicate of what is in
alloc_pages_exact().  This patch converts alloc_large_system_hash() to use
Signed-off-by: default avatarMel Gorman <>
Acked-by: default avatarHugh Dickins <>
Cc: Christoph Lameter <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 72807a74
......@@ -4699,26 +4699,13 @@ void *__init alloc_large_system_hash(const char *tablename,
else if (hashdist)
table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
else {
unsigned long order = get_order(size);
if (order < MAX_ORDER)
table = (void *)__get_free_pages(GFP_ATOMIC,
* If bucketsize is not a power-of-two, we may free
* some pages at the end of hash table.
* some pages at the end of hash table which
* alloc_pages_exact() automatically does
if (table) {
unsigned long alloc_end = (unsigned long)table +
(PAGE_SIZE << order);
unsigned long used = (unsigned long)table +
split_page(virt_to_page(table), order);
while (used < alloc_end) {
used += PAGE_SIZE;
if (get_order(size) < MAX_ORDER)
table = alloc_pages_exact(size, GFP_ATOMIC);
} while (!table && size > PAGE_SIZE && --log2qty);
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