From 6e692ed37a507e18d8afe8e5faebd8c4722c5f12 Mon Sep 17 00:00:00 2001 From: John Hawkes Date: Sat, 25 Mar 2006 03:08:02 -0800 Subject: [PATCH] [PATCH] fix alloc_large_system_hash() roundup The "rounded up to nearest power of 2 in size" algorithm in alloc_large_system_hash is not correct. As coded, it takes an otherwise acceptable power-of-2 value and doubles it. For example, we see the error if we boot with thash_entries=2097152 which produces a hash table with 4194304 entries. Signed-off-by: John Hawkes Cc: Roland Dreier Cc: "Chen, Kenneth W" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 637f57ff5b..338a02bb00 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2702,8 +2702,7 @@ void *__init alloc_large_system_hash(const char *tablename, else numentries <<= (PAGE_SHIFT - scale); } - /* rounded up to nearest power of 2 in size */ - numentries = 1UL << (long_log2(numentries) + 1); + numentries = roundup_pow_of_two(numentries); /* limit allocation size to 1/16 total memory by default */ if (max == 0) { -- 2.39.5