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authorMel Gorman <mel@csn.ul.ie>2009-06-16 15:32:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:36 -0700
commita1dd268cf6306565a31a48deff8bf4f6b4b105f7 (patch)
treea6d2cfb6647b22f5896813e7f39db8546e921ef2 /mm/page_alloc.c
parent72807a74c0172376bba6b5b27702c9f702b526e9 (diff)
downloadconfigs-a1dd268cf6306565a31a48deff8bf4f6b4b105f7.tar.gz
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 alloc_pages_exact(). Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c21
1 files changed, 4 insertions, 17 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 85759cdd697..8ca06d87dc1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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,
- order);
/*
* 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 +
- PAGE_ALIGN(size);
- split_page(virt_to_page(table), order);
- while (used < alloc_end) {
- free_page(used);
- used += PAGE_SIZE;
- }
- }
+ if (get_order(size) < MAX_ORDER)
+ table = alloc_pages_exact(size, GFP_ATOMIC);
}
} while (!table && size > PAGE_SIZE && --log2qty);