From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Paul Mackerras <paulus@samba.org>,
David Howells <dhowells@redhat.com>,
akpm@osdl.org, linux-arch@vger.kernel.org, bcrl@linux.intel.com,
matthew@wil.cx, linux-kernel@vger.kernel.org, mingo@redhat.com,
linuxppc64-dev@ozlabs.org, jblunck@suse.de
Subject: Re: Memory barriers and spin_unlock safety
Date: Wed, 08 Mar 2006 13:12:57 +0000 [thread overview]
Message-ID: <1141823577.7605.31.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.64.0603071930530.32577@g5.osdl.org>
On Maw, 2006-03-07 at 19:54 -0800, Linus Torvalds wrote:
> Close, yes. HOWEVER, it's only really ordered wrt the "innermost" bus. I
> don't think PCI bridges are supposed to post PIO writes, but a x86 CPU
> basically won't stall for them forever.
The bridges I have will stall forever. You can observe this directly if
an IDE device decides to hang the IORDY line on the IDE cable or you
crash the GPU on an S3 card.
Alan
next prev parent reply other threads:[~2006-03-08 13:08 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-03 16:03 Memory barriers and spin_unlock safety David Howells
2006-03-03 16:45 ` David Howells
2006-03-03 17:03 ` Linus Torvalds
2006-03-03 20:17 ` David Howells
2006-03-03 21:34 ` Linus Torvalds
2006-03-03 21:51 ` Benjamin LaHaise
2006-03-03 22:21 ` Linus Torvalds
2006-03-03 22:36 ` Linus Torvalds
2006-03-07 17:36 ` David Howells
2006-03-07 17:40 ` Matthew Wilcox
2006-03-07 17:56 ` Jesse Barnes
2006-03-07 18:18 ` Alan Cox
2006-03-07 18:28 ` Linus Torvalds
2006-03-07 18:55 ` Alan Cox
2006-03-07 20:21 ` Linus Torvalds
2006-03-03 20:02 ` Arjan van de Ven
2006-03-03 16:55 ` Linus Torvalds
2006-03-03 20:15 ` David Howells
2006-03-03 21:31 ` Linus Torvalds
2006-03-03 21:06 ` Benjamin Herrenschmidt
2006-03-03 21:18 ` Hollis Blanchard
2006-03-03 21:52 ` David S. Miller
2006-03-03 22:04 ` Linus Torvalds
2006-03-04 10:58 ` Paul Mackerras
2006-03-04 22:49 ` Benjamin Herrenschmidt
2006-03-04 10:58 ` Paul Mackerras
2006-03-04 17:28 ` Linus Torvalds
2006-03-08 3:20 ` Paul Mackerras
2006-03-08 3:54 ` Linus Torvalds
2006-03-08 13:12 ` Alan Cox [this message]
2006-03-08 15:30 ` Linus Torvalds
2006-03-05 2:04 ` Michael Buesch
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