From: "Larry H." <research@subreption.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-mm@kvack.org, Alan Cox <alan@lxorguk.ukuu.org.uk>,
Rik van Riel <riel@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Change ZERO_SIZE_PTR to point at unmapped space
Date: Sat, 30 May 2009 16:00:22 -0700 [thread overview]
Message-ID: <20090530230022.GO6535@oblivion.subreption.com> (raw)
In-Reply-To: <alpine.LFD.2.01.0905301528540.3435@localhost.localdomain>
On 15:29 Sat 30 May , Linus Torvalds wrote:
>
>
> On Sat, 30 May 2009, Larry H. wrote:
> >
> > The ZERO_OR_NULL_PTR macro is changed accordingly. This patch does
> > not modify its behavior nor has any performance nor functionality
> > impact.
>
> I'm sure it makes a code generation difference, with (a) big constants and
> (b) no longer possible to merge the conditional into one single one.
Like I said in the reply to Peter, this is 3 extra bytes for amd64 with
gcc 4.3.3. I can't be bothered to check other architectures at the
moment.
Larry
WARNING: multiple messages have this Message-ID (diff)
From: "Larry H." <research@subreption.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-mm@kvack.org, Alan Cox <alan@lxorguk.ukuu.org.uk>,
Rik van Riel <riel@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Change ZERO_SIZE_PTR to point at unmapped space
Date: Sat, 30 May 2009 16:00:22 -0700 [thread overview]
Message-ID: <20090530230022.GO6535@oblivion.subreption.com> (raw)
In-Reply-To: <alpine.LFD.2.01.0905301528540.3435@localhost.localdomain>
On 15:29 Sat 30 May , Linus Torvalds wrote:
>
>
> On Sat, 30 May 2009, Larry H. wrote:
> >
> > The ZERO_OR_NULL_PTR macro is changed accordingly. This patch does
> > not modify its behavior nor has any performance nor functionality
> > impact.
>
> I'm sure it makes a code generation difference, with (a) big constants and
> (b) no longer possible to merge the conditional into one single one.
Like I said in the reply to Peter, this is 3 extra bytes for amd64 with
gcc 4.3.3. I can't be bothered to check other architectures at the
moment.
Larry
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next prev parent reply other threads:[~2009-05-30 23:02 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-30 19:28 [PATCH] Change ZERO_SIZE_PTR to point at unmapped space Larry H.
2009-05-30 19:28 ` Larry H.
2009-05-30 22:29 ` Linus Torvalds
2009-05-30 22:29 ` Linus Torvalds
2009-05-30 23:00 ` Larry H. [this message]
2009-05-30 23:00 ` Larry H.
2009-05-31 2:02 ` Linus Torvalds
2009-05-31 2:02 ` Linus Torvalds
2009-05-31 2:21 ` Larry H.
2009-05-31 2:21 ` Larry H.
2009-06-02 15:37 ` Christoph Lameter
2009-06-02 15:37 ` Christoph Lameter
2009-06-02 20:34 ` Larry H.
2009-06-02 20:34 ` Larry H.
2009-06-03 14:50 ` Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE_PTR to point at unmapped space) Christoph Lameter
2009-06-03 14:50 ` Christoph Lameter
2009-06-03 15:07 ` Linus Torvalds
2009-06-03 15:07 ` Linus Torvalds
2009-06-03 15:23 ` Christoph Lameter
2009-06-03 15:23 ` Christoph Lameter
2009-06-03 15:38 ` Linus Torvalds
2009-06-03 15:38 ` Linus Torvalds
2009-06-03 16:14 ` Alan Cox
2009-06-03 16:14 ` Alan Cox
2009-06-03 16:19 ` Linus Torvalds
2009-06-03 16:19 ` Linus Torvalds
2009-06-03 16:24 ` Eric Paris
2009-06-03 16:24 ` Eric Paris
2009-06-03 16:22 ` Eric Paris
2009-06-03 16:22 ` Eric Paris
2009-06-03 16:28 ` Linus Torvalds
2009-06-03 16:28 ` Linus Torvalds
2009-06-03 16:32 ` Eric Paris
2009-06-03 16:32 ` Eric Paris
2009-06-03 16:44 ` Linus Torvalds
2009-06-03 16:44 ` Linus Torvalds
2009-06-03 15:11 ` Stephen Smalley
2009-06-03 15:11 ` Stephen Smalley
2009-06-03 15:41 ` Christoph Lameter
2009-06-03 15:41 ` Christoph Lameter
2009-06-03 16:18 ` Linus Torvalds
2009-06-03 16:18 ` Linus Torvalds
2009-06-03 16:28 ` Larry H.
2009-06-03 16:28 ` Larry H.
2009-06-03 16:36 ` Rik van Riel
2009-06-03 16:36 ` Rik van Riel
2009-06-03 16:47 ` Linus Torvalds
2009-06-03 16:47 ` Linus Torvalds
2009-06-03 17:16 ` Eric Paris
2009-06-03 17:16 ` Eric Paris
2009-06-03 17:28 ` Linus Torvalds
2009-06-03 17:28 ` Linus Torvalds
2009-06-03 17:31 ` Eric Paris
2009-06-03 17:31 ` Eric Paris
2009-06-03 17:24 ` Larry H.
2009-06-03 17:24 ` Larry H.
2009-06-03 17:21 ` Larry H.
2009-06-03 17:21 ` Larry H.
2009-06-03 22:52 ` James Morris
2009-06-03 22:52 ` James Morris
2009-06-03 17:29 ` Alan Cox
2009-06-03 17:29 ` Alan Cox
2009-06-03 17:35 ` Linus Torvalds
2009-06-03 17:35 ` Linus Torvalds
2009-06-03 18:00 ` Larry H.
2009-06-03 18:00 ` Larry H.
2009-06-03 18:12 ` Linus Torvalds
2009-06-03 18:12 ` Linus Torvalds
2009-06-03 18:39 ` Larry H.
2009-06-03 18:39 ` Larry H.
2009-06-03 18:45 ` Linus Torvalds
2009-06-03 18:45 ` Linus Torvalds
2009-06-03 18:50 ` Linus Torvalds
2009-06-03 18:50 ` Linus Torvalds
2009-06-03 18:59 ` Christoph Lameter
2009-06-03 18:59 ` Christoph Lameter
2009-06-03 19:11 ` Rik van Riel
2009-06-03 19:11 ` Rik van Riel
2009-06-03 19:14 ` Eric Paris
2009-06-03 19:14 ` Eric Paris
2009-06-03 19:42 ` Christoph Lameter
2009-06-03 19:42 ` Christoph Lameter
2009-06-03 19:51 ` Eric Paris
2009-06-03 19:51 ` Eric Paris
2009-06-03 20:04 ` Christoph Lameter
2009-06-03 20:04 ` Christoph Lameter
2009-06-03 20:16 ` Eric Paris
2009-06-03 20:16 ` Eric Paris
2009-06-03 20:36 ` Christoph Lameter
2009-06-03 20:36 ` Christoph Lameter
2009-06-03 21:20 ` Linus Torvalds
2009-06-03 21:20 ` Linus Torvalds
2009-06-04 2:41 ` James Morris
2009-06-04 2:41 ` James Morris
2009-06-03 19:21 ` Alan Cox
2009-06-03 19:21 ` Alan Cox
2009-06-03 19:45 ` Christoph Lameter
2009-06-03 19:45 ` Christoph Lameter
2009-06-03 21:07 ` Alan Cox
2009-06-03 21:07 ` Alan Cox
2009-06-03 19:27 ` Linus Torvalds
2009-06-03 19:27 ` Linus Torvalds
2009-06-03 19:50 ` Christoph Lameter
2009-06-03 19:50 ` Christoph Lameter
2009-06-03 20:00 ` pageexec
2009-06-03 20:00 ` pageexec
2009-06-03 19:41 ` pageexec
2009-06-03 19:41 ` pageexec
2009-06-07 10:29 ` Pavel Machek
2009-06-07 10:29 ` Pavel Machek
2009-05-30 22:32 ` [PATCH] Change ZERO_SIZE_PTR to point at unmapped space Peter Zijlstra
2009-05-30 22:32 ` Peter Zijlstra
2009-05-30 22:51 ` Larry H.
2009-05-30 22:51 ` Larry H.
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