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

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Message-ID: <alpine.LFD.2.01.0907271951390.3186@localhost.localdomain>
Date:	Mon, 27 Jul 2009 19:52:35 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] mm: Make it easier to catch NULL cache names



On Tue, 28 Jul 2009, Benjamin Herrenschmidt wrote:
>
> 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.

Please don't do BUG_ON() when there are alternatives.

In this case, something like

	if (WARN_ON(!name))
		return NULL;

would probably have worked too.

		Linus
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