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From: Roland Dreier <roland@topspin.com>
To: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
Cc: Linus Torvalds <torvalds@osdl.org>,
	Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Being more anal about iospace accesses..
Date: Wed, 15 Sep 2004 10:16:05 -0700	[thread overview]
Message-ID: <524qlzxxka.fsf@topspin.com> (raw)
In-Reply-To: <20040915165450.GD6158@wohnheim.fh-wedel.de>  =?iso-8859-1?q?=28J=F6rn?= Engel's message of "Wed, 15 Sep 2004 18:54:50 +0200")

    Jörn> C now supports pointer arithmetic with void*?  I hope the
    Jörn> width of a void is not architecture dependent, that would
    Jörn> introduce more subtle bugs.

Pointer arithmetic on void * has been a gcc extension since forever
(gcc acts as though sizeof (void) == 1).

However, I somewhat agree -- it's ugly for drivers rely on this and do
arithmetic on void *.  It should be OK for a driver to use 
char __iomem * for its IO base if it needs to add in offsets, right?

 - R.

  parent reply	other threads:[~2004-09-15 17:21 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
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 [this message]
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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