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mm: alloc_large_system_hash check order

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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 <hugh.dickins@tiscali.co.uk>
Cc: David Miller <davem@davemloft.net>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2009-06-16 15:31:50 -07:00 committed by Linus Torvalds
parent 58568d2a82
commit 6c0db4664b
1 changed files with 4 additions and 1 deletions
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5
mm/page_alloc.c
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@ -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.