From: Christoph Lameter <clameter@sgi.com>
To: Paul Jackson <pj@sgi.com>
Cc: srinivasa@in.ibm.com, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, torvalds@linux-foundation.org,
vatsa@in.ibm.com, dino@in.ibm.com, simon.derr@bull.net,
clameter@cthulhu.engr.sgi.com, rientjes@google.com
Subject: Re: [RFC] [PATCH] cpuset operations causes Badness at mm/slab.c:777 warning
Date: Fri, 1 Jun 2007 13:06:49 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0706011305230.3976@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20070601130212.7be4432a.pj@sgi.com>
On Fri, 1 Jun 2007, Paul Jackson wrote:
> > We must have a NULL pointer exactly because it cannot be dereferenced.
>
> Well, both patch versions had NULL pointers - either pidarray or ctr->buf.
>
> But now I can make more sense of what you say -- you -want- the pidarray
> pointer, in particular, to be NULL, so that we don't accidentally use it.
>
> Does that still mean that your patch suggestion was incomplete, in that
> it lacked the additional checks to avoid using a NULL pidarray?
There are no checks necessary. Your function worked fine so far for
the case of zero objects with the pointer returned by kmalloc. If the
code is correct then it will not dereference the pointer to the zero
sized array. If not then we may find a bug and fix it.
next prev parent reply other threads:[~2007-06-01 20:07 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-01 7:27 Srinivasa Ds
2007-06-01 10:50 ` Srinivasa Ds
2007-06-01 18:13 ` Christoph Lameter
2007-06-01 19:11 ` Paul Jackson
2007-06-01 19:18 ` Christoph Lameter
2007-06-01 19:47 ` Paul Jackson
2007-06-01 19:51 ` Christoph Lameter
2007-06-01 20:02 ` Paul Jackson
2007-06-01 20:06 ` Christoph Lameter [this message]
2007-06-01 20:19 ` Paul Jackson
2007-06-01 20:43 ` Christoph Lameter
2007-06-01 20:54 ` Paul Jackson
2007-06-01 20:30 ` Jeremy Fitzhardinge
2007-06-01 20:44 ` Paul Jackson
2007-06-01 20:47 ` Christoph Lameter
2007-06-01 20:56 ` Jeremy Fitzhardinge
2007-06-01 20:59 ` Andrew Morton
2007-06-01 21:45 ` Christoph Lameter
2007-06-01 22:16 ` Andrew Morton
2007-06-01 22:20 ` Christoph Lameter
2007-06-01 22:33 ` Andrew Morton
2007-06-01 22:41 ` Christoph Lameter
2007-06-01 23:00 ` Linus Torvalds
2007-06-01 23:29 ` Christoph Lameter
2007-06-01 23:41 ` Linus Torvalds
2007-06-01 23:46 ` Christoph Lameter
2007-06-01 23:57 ` Linus Torvalds
2007-06-02 0:12 ` Christoph Lameter
2007-06-02 0:16 ` Andrew Morton
2007-06-02 0:26 ` Christoph Lameter
2007-06-02 1:04 ` Linus Torvalds
2007-06-02 0:46 ` Jeremy Fitzhardinge
2007-06-02 1:05 ` Valdis.Kletnieks
2007-06-02 1:24 ` Christoph Lameter
2007-06-01 23:02 ` Andrew Morton
2007-06-01 23:16 ` Christoph Lameter
2007-06-01 23:21 ` Christoph Lameter
2007-06-01 23:36 ` Linus Torvalds
2007-06-01 23:42 ` Christoph Lameter
2007-06-01 23:25 ` Linus Torvalds
2007-06-02 0:41 ` Jeremy Fitzhardinge
2007-06-02 0:43 ` Jeremy Fitzhardinge
2007-06-02 0:51 ` Andrew Morton
2007-06-02 0:59 ` Jeremy Fitzhardinge
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