From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Matthew Wilcox <willy@debian.org>,
James Bottomley <James.Bottomley@steeleye.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Linux Arch list <linux-arch@vger.kernel.org>,
Al Viro <viro@parcelfarce.linux.theplanet.co.uk>,
Andrew Morton <akpm@osdl.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
"David S. Miller" <davem@redhat.com>,
Jeff Garzik <jgarzik@pobox.com>
Subject: Re: RFC: being more anal about iospace accesses..
Date: Thu, 16 Sep 2004 14:57:49 +1000 [thread overview]
Message-ID: <1095310669.5109.4.camel@gaston> (raw)
In-Reply-To: <Pine.LNX.4.58.0409152117020.2333@ppc970.osdl.org>
On Thu, 2004-09-16 at 14:28, Linus Torvalds wrote:
> (Note that 64-bit accesses aren't necessarily atomic even on 64-bit
> architectures. BenH says that the IO architecture on a G5 means that when
> you do a 64-bit load, it will be done as two 32-bit bus cycles
> regardless).
Yup, at least with the current models, due to the fact that the U3
northbridge basically has a 32 bits path to IO devices. Note that this
isn't the case with IBM machines who do proper 64 bits PCI IOs.
Ben.
next prev parent reply other threads:[~2004-09-16 5:04 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-08 22:57 RFC: being more anal about iospace accesses Linus Torvalds
2004-09-08 23:07 ` David S. Miller
2004-09-08 23:25 ` Linus Torvalds
2004-09-09 1:19 ` Linus Torvalds
2004-09-09 4:36 ` David S. Miller
2004-09-09 5:56 ` Richard Henderson
2004-09-09 5:04 ` viro
2004-09-09 5:05 ` David S. Miller
2004-09-09 5:13 ` Linus Torvalds
2004-09-09 6:08 ` viro
2004-09-09 8:27 ` Geert Uytterhoeven
2004-09-09 6:23 ` David Woodhouse
2004-09-09 13:14 ` Alan Cox
2004-09-11 6:09 ` Linus Torvalds
2004-09-11 6:42 ` Anton Blanchard
2004-09-11 7:26 ` Benjamin Herrenschmidt
2004-09-11 7:29 ` Geert Uytterhoeven
2004-09-11 7:23 ` Benjamin Herrenschmidt
2004-09-11 14:42 ` Alan Cox
2004-09-15 15:03 ` Linus Torvalds
2004-09-15 16:30 ` Being " 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
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 19:02 ` RFC: being more anal " Geert Uytterhoeven
2004-09-15 19:16 ` Linus Torvalds
2004-09-15 19:40 ` Matthew Wilcox
2004-09-15 20:10 ` Linus Torvalds
2004-09-15 20:17 ` Linus Torvalds
2004-09-16 12:17 ` David Woodhouse
2004-09-16 13:52 ` Linus Torvalds
2004-09-15 20:20 ` Russell King
2004-09-15 20:34 ` Linus Torvalds
2004-09-15 20:51 ` Linus Torvalds
2004-09-15 22:38 ` James Bottomley
2004-09-16 2:33 ` Matthew Wilcox
2004-09-16 4:28 ` Linus Torvalds
2004-09-16 4:57 ` Benjamin Herrenschmidt [this message]
2004-09-16 4:58 ` Benjamin Herrenschmidt
2004-09-16 13:41 ` Matthew Wilcox
2004-09-16 18:21 ` Linus Torvalds
2004-09-16 18:52 ` Jesse Barnes
2004-09-16 19:09 ` Linus Torvalds
2004-09-16 20:02 ` Jesse Barnes
2004-09-16 20:37 ` James Bottomley
2004-09-16 20:42 ` Jesse Barnes
2004-09-16 21:37 ` Grant Grundler
2004-09-16 20:04 ` David S. Miller
2004-09-16 20:13 ` Jeff Garzik
2004-09-16 20:45 ` David S. Miller
2004-09-16 20:20 ` Jesse Barnes
2004-09-17 5:17 ` Benjamin Herrenschmidt
2004-09-17 15:30 ` Jesse Barnes
2004-09-16 19:01 ` Linus Torvalds
2004-09-16 19:13 ` Jeff Garzik
2004-09-16 19:50 ` Linus Torvalds
2004-09-16 20:07 ` Alan Cox
2004-09-17 5:44 ` Benjamin Herrenschmidt
2004-09-17 5:20 ` Benjamin Herrenschmidt
2004-09-17 15:03 ` Linus Torvalds
2004-09-16 22:30 ` Matthew Wilcox
2004-09-16 22:42 ` Linus Torvalds
2004-09-16 22:46 ` Jeff Garzik
2004-09-16 23:15 ` Linus Torvalds
2004-09-16 23:30 ` Jeff Garzik
2004-09-16 23:43 ` Linus Torvalds
2004-09-17 12:44 ` Matthew Wilcox
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