linux-kernel - Re: kfree(0)

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Message-ID: <Pine.LNX.4.64.0708172036151.30502@fbirervta.pbzchgretzou.qr>
Date:	Fri, 17 Aug 2007 20:37:00 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Satyam Sharma <satyam@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Tim Bird <tim.bird@...sony.com>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: kfree(0) - ok?


On Aug 17 2007 11:22, Andrew Morton wrote:

>Which is getting pretty idiotic:
>
>akpm:/usr/src/25> grep ZERO_OR_NULL_PTR */*.c
>mm/slab.c:              BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
>mm/slab.c:      if (unlikely(ZERO_OR_NULL_PTR(cachep)))
>mm/slab.c:      if (unlikely(ZERO_OR_NULL_PTR(cachep)))
>mm/slab.c:      if (unlikely(ZERO_OR_NULL_PTR(objp)))
>mm/slab.c:      if (unlikely(ZERO_OR_NULL_PTR(objp)))
>mm/slob.c:      if (unlikely(ZERO_OR_NULL_PTR(block)))
>mm/slob.c:      if (unlikely(ZERO_OR_NULL_PTR(block)))
>mm/slob.c:      if (unlikely(ZERO_OR_NULL_PTR(block)))
>mm/slub.c:      if (unlikely(ZERO_OR_NULL_PTR(s)))
>mm/slub.c:      if (unlikely(ZERO_OR_NULL_PTR(s)))
>mm/slub.c:      if (unlikely(ZERO_OR_NULL_PTR(object)))
>mm/slub.c:      if (unlikely(ZERO_OR_NULL_PTR(x)))
>mm/slub.c:      if (unlikely(ZERO_OR_NULL_PTR(s)))
>mm/slub.c:      if (unlikely(ZERO_OR_NULL_PTR(s)))
>
>are we seeing a pattern here?  We could stick the unlikely inside
>ZERO_OR_NULL_PTR() itself.

Yeah,

	BUG_ON(unlikely(ZERO_OR_NULL_PTR(..)))

that will really help the bug - "hm, it's Friday, let's BUG" ;-)



	Jan
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