From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org
Subject: Re: [RFC 0/4] CONFIG_STABLE to switch off development checks
Date: Sat, 02 Jun 2007 09:28:38 -0700 [thread overview]
Message-ID: <46619AB6.5060606@goop.org> (raw)
In-Reply-To: <1180797790.18535.6.camel@kleikamp.austin.ibm.com>
Dave Kleikamp wrote:
> I'm on Christoph's side here. I don't think it makes sense for any code
> to ask to allocate zero bytes of memory and expect valid memory to be
> returned.
>
Yes, everyone agrees on that. If you do kmalloc(0), its never OK to
dereference the result. The question is whether kmalloc(0) should complain.
> Would a compromise be to return a pointer to some known invalid region?
> This way the kmalloc(0) call would appear successful to the caller, but
> any access to the memory would result in an exception.
>
Yes, that's what Christoph has posted. I'm slightly concerned about
kmalloc() returning the same non-NULL address multiple times, but it
seems sound otherwise.
J
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next prev parent reply other threads:[~2007-06-02 16:28 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-31 0:20 clameter
2007-05-31 0:20 ` [RFC 1/4] CONFIG_STABLE: Define it clameter
2007-05-31 0:35 ` young dave
2007-05-31 0:49 ` Christoph Lameter
2007-06-01 18:08 ` Dave Jones
2007-06-01 18:25 ` Christoph Lameter
2007-05-31 8:54 ` Stefan Richter
2007-05-31 9:03 ` David Miller, Stefan Richter
2007-05-31 9:03 ` Stefan Richter
2007-05-31 21:11 ` Andrew Morton
2007-05-31 21:14 ` Christoph Lameter
2007-05-31 21:30 ` Sam Ravnborg
2007-06-01 18:02 ` Dave Jones
2007-06-01 20:22 ` Sam Ravnborg
2007-06-01 20:30 ` Dave Jones
2007-06-01 20:55 ` Sam Ravnborg
2007-06-01 20:25 ` Sam Ravnborg
2007-07-20 10:41 ` Satyam Sharma
2007-07-20 11:09 ` Chris Snook
2007-07-20 11:27 ` Satyam Sharma
2007-07-20 11:34 ` Chris Snook
2007-07-20 11:40 ` Satyam Sharma
2007-07-20 11:50 ` Chris Snook
2007-07-20 16:48 ` Stefan Richter
2007-07-20 16:28 ` Stefan Richter
2007-07-20 16:36 ` Stefan Richter
2007-07-20 19:09 ` Chuck Ebbert
2007-05-31 0:20 ` [RFC 2/4] CONFIG_STABLE: Switch off kmalloc(0) tests in slab allocators clameter
2007-05-31 19:51 ` Zach Brown
2007-05-31 22:37 ` Andi Kleen
2007-05-31 0:20 ` [RFC 3/4] CONFIG_STABLE: Switch off SLUB banner clameter
2007-05-31 0:20 ` [RFC 4/4] CONFIG_STABLE: SLUB: Prefer object corruption over failure clameter
2007-06-01 14:55 ` [RFC 0/4] CONFIG_STABLE to switch off development checks Jeremy Fitzhardinge
2007-06-01 18:38 ` Christoph Lameter
2007-06-01 18:58 ` Jeremy Fitzhardinge
2007-06-01 20:59 ` Christoph Lameter
2007-06-01 21:24 ` Jeremy Fitzhardinge
2007-06-02 15:23 ` Dave Kleikamp
2007-06-02 16:28 ` Jeremy Fitzhardinge [this message]
2007-06-04 1:03 ` Dave Kleikamp
[not found] <fa.UBCbBXgIW93M6j2F+d+umQ5+v9I@ifi.uio.no>
[not found] ` <fa.iaekQW/Par/E6eIpnL0NjEdCUxc@ifi.uio.no>
[not found] ` <fa.2BlkzuhauAATrsG1MYhPMeWMhPM@ifi.uio.no>
[not found] ` <fa.o9WA1K75HxwNnBEQDyoQMfWVpiQ@ifi.uio.no>
[not found] ` <fa.wiSgrIhkRNkkC7Wh6Bt3BY4z7BM@ifi.uio.no>
2007-06-05 0:38 ` Robert Hancock
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