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From: Nikita Danilov <nikita@clusterfs.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: "Jörn Engel" <joern@wohnheim.fh-wedel.de>,
	"Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: Being more anal about iospace accesses..
Date: Wed, 15 Sep 2004 21:45:57 +0400	[thread overview]
Message-ID: <16712.32725.515306.890990@thebsh.namesys.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0409151004370.2333@ppc970.osdl.org>

Linus Torvalds writes:
 > 
 > 
 > On Wed, 15 Sep 2004, JЖrn Engel wrote:
 > > 
 > > C now supports pointer arithmetic with void*?
 > 
 > C doesn't. gcc does. It's a documented extension, and it acts like if it 
 > was done on a byte.
 > 
 > See gcc's user guide "Extension to the C Language Family".
 > 
 > It's a singularly good feature. 

Unfortunately it breaks even better identity

  foo *p;

  p + nr == (foo *)((char *)p + nr * sizeof *p)

unless one thinks that is --together with gcc-- that nothing occupies
exactly one byte.

 > 
 > 		Linus

Nikita.


  parent reply	other threads:[~2004-09-15 17:49 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <Pine.LNX.4.58.0409081543320.5912@ppc970.osdl.org>
     [not found] ` <Pine.LNX.4.58.0409150737260.2333@ppc970.osdl.org>
2004-09-15 16:30   ` Being more anal about iospace accesses Linus Torvalds
2004-09-15 16:54     ` Jörn Engel
2004-09-15 17:07       ` Linus Torvalds
2004-09-15 17:32         ` Jörn Engel
2004-09-15 17:57           ` Linus Torvalds
2004-09-15 18:06             ` Linus Torvalds
2004-09-15 19:34             ` Greg KH
2004-09-15 19:53               ` Linus Torvalds
2004-09-15 20:06                 ` Greg KH
2004-09-16 14:58             ` Horst von Brand
2004-09-15 17:45         ` Nikita Danilov [this message]
2004-09-15 18:09           ` Linus Torvalds
2004-09-15 18:40         ` Chris Wedgwood
2004-09-15 17:07       ` Jeff Garzik
2004-09-15 17:16       ` Roland Dreier
2004-09-15 17:39         ` Linus Torvalds
2004-09-15 20:07           ` Russell King
2004-09-15 17:36       ` Horst von Brand
2004-09-15 17:40       ` Brian Gerst
2004-09-15 16:56     ` Dave Jones
2004-09-15 17:19     ` Roger Luethi
2004-09-15 17:23     ` Richard B. Johnson
2004-09-15 22:21     ` Deepak Saxena
2004-09-15 22:46       ` Linus Torvalds
2004-09-15 23:09         ` Deepak Saxena
2004-09-16 12:51           ` Geert Uytterhoeven
2004-09-16 22:10             ` Deepak Saxena
2004-09-15 22:29     ` Roland Dreier
2004-09-15 23:26       ` Being more careful " Linus Torvalds
2004-09-16  0:10         ` viro
2004-09-16 11:40           ` David Woodhouse
2004-09-16 12:25         ` David Woodhouse
2004-09-16 14:01           ` Linus Torvalds
2004-09-18  9:46             ` Kai Henningsen
2004-09-15 18:25 Being more anal " linux

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