From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id D98E46B004D for ; Tue, 28 Jul 2009 00:11:32 -0400 (EDT) Subject: [PATCH] mm: Make it easier to catch NULL cache names From: Benjamin Herrenschmidt Content-Type: text/plain Date: Tue, 28 Jul 2009 14:11:29 +1000 Message-Id: <1248754289.30993.45.camel@pasglop> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Linus Torvalds Cc: Andrew Morton , Linux Kernel list , linux-mm List-ID: Right now, if you inadvertently pass NULL to kmem_cache_create() at boot time, it crashes much later after boot somewhere deep inside sysfs which makes it very non obvious to figure out what's going on. Signed-off-by: Benjamin Herrenschmidt --- Yes, I did hit that :-) Something in ppc land using an array of caches and got the names array out of sync with changes to the list of indices. mm/slub.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index b9f1491..e31fbe6 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3292,6 +3292,9 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, { struct kmem_cache *s; + if (WARN_ON(!name)) + return NULL; + down_write(&slub_lock); s = find_mergeable(size, align, flags, name, ctor); if (s) { -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org