From 6c0db4664b49417d80988953e69c323721353227 Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Tue, 16 Jun 2009 15:31:50 -0700 Subject: [PATCH] mm: alloc_large_system_hash check order On an x86_64 with 4GB ram, tcp_init()'s call to alloc_large_system_hash(), to allocate tcp_hashinfo.ehash, is now triggering an mmotm WARN_ON_ONCE on order >= MAX_ORDER - it's hoping for order 11. alloc_large_system_hash() had better make its own check on the order. Signed-off-by: Hugh Dickins Cc: David Miller Cc: Mel Gorman Cc: Eric Dumazet Cc: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 7cc3179e3591..cbed869fd831 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4511,7 +4511,10 @@ void *__init alloc_large_system_hash(const char *tablename, table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); else { unsigned long order = get_order(size); - table = (void*) __get_free_pages(GFP_ATOMIC, order); + + 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. -- 2.20.1