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From: "David S. Miller" <davem@redhat.com>
To: Willy Tarreau <willy@w.ods.org>
Cc: jamie@shareable.org, albert@users.sourceforge.net,
	linux-kernel@vger.kernel.org, chip@pobox.com
Subject: Re: [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers
Date: Sat, 9 Aug 2003 01:51:42 -0700	[thread overview]
Message-ID: <20030809015142.56190015.davem@redhat.com> (raw)
In-Reply-To: <20030809081346.GC29616@alpha.home.local>

On Sat, 9 Aug 2003 10:13:46 +0200
Willy Tarreau <willy@w.ods.org> wrote:

> (how could !!x be 0 if x isn't ?)

I believe the C language allows for systems where the NULL pointer is
not zero.

I can't think of any reason why the NULL macro exists otherwise.

However, even if I'm right, I dread the guy who has to make other
people's code work on such a platform.  Using normal boolean tests for
NULL pointer checks is just too common.


  reply	other threads:[~2003-08-09  8:52 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-05 12:44 [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers Albert Cahalan
2003-08-09  0:21 ` Jamie Lokier
2003-08-09  8:13   ` Willy Tarreau
2003-08-09  8:51     ` David S. Miller [this message]
2003-08-09  9:36       ` Jamie Lokier
2003-08-09 10:10       ` Herbert Xu
2003-08-09 10:42       ` Alan Cox
2003-08-09 16:23         ` Jamie Lokier
2003-08-09 17:30           ` NULL. Again. (was Re: [PATCH] 2.4.22pre10: {,un}likely_p()) Chip Salzenberg
2003-08-09 17:43             ` Sean Neakums
2003-08-11  1:04               ` Jamie Lokier
2003-08-11 23:06               ` Timothy Miller
2003-08-09 19:44             ` Jamie Lokier
  -- strict thread matches above, loose matches on Subject: below --
2003-08-10  4:03 [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers Albert Cahalan
2003-08-10  7:29 ` Willy Tarreau
2003-08-10  8:02   ` Willy Tarreau
2003-08-11  1:23   ` Chip Salzenberg
2003-08-11  2:09     ` Jamie Lokier
2003-08-11  2:39       ` Chip Salzenberg
2003-08-11  4:02         ` Albert Cahalan
2003-08-11  4:30         ` Jamie Lokier
2003-08-11  5:30         ` Willy Tarreau
2003-08-11  5:42           ` Jamie Lokier
2003-08-11 13:09             ` Albert Cahalan
2003-08-11 18:55               ` Andrew Morton
2003-08-11 23:13                 ` Albert Cahalan
2003-08-13 19:42                   ` Jamie Lokier
2003-08-11  4:55   ` Jamie Lokier
2003-08-11  5:26     ` Willy Tarreau
2003-08-11  5:38       ` Jamie Lokier
2003-08-04 17:06 Chip Salzenberg

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