linux-kernel - [PATCH] mm: Make it easier to catch NULL cache names

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Message-Id: <1248754289.30993.45.camel@pasglop>
Date:	Tue, 28 Jul 2009 14:11:29 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: [PATCH] mm: Make it easier to catch NULL cache names

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 <benh@...nel.crashing.org>
---

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) {




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