From: Matthew Wilcox <matthew@wil.cx>
To: David Howells <dhowells@redhat.com>
Cc: Linus Torvalds <torvalds@osdl.org>,
akpm@osdl.org, ak@suse.de, mingo@redhat.com, jblunck@suse.de,
bcrl@linux.intel.com, linux-arch@vger.kernel.org,
linuxppc64-dev@ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: Memory barriers and spin_unlock safety
Date: Tue, 7 Mar 2006 10:40:57 -0700 [thread overview]
Message-ID: <20060307174057.GD7301@parisc-linux.org> (raw)
In-Reply-To: <31420.1141753019@warthog.cambridge.redhat.com>
On Tue, Mar 07, 2006 at 05:36:59PM +0000, David Howells wrote:
> David Howells <dhowells@redhat.com> wrote:
>
> > I suspect, then, that x86_64 should not have an SFENCE for smp_wmb(), and
> > that only io_wmb() should have that.
>
> Hmmm... We don't actually have io_wmb()... Should the following be added to
> all archs?
>
> io_mb()
> io_rmb()
> io_wmb()
it's spelled mmiowb(), and reads from IO space are synchronous, so don't
need barriers.
next prev parent reply other threads:[~2006-03-07 17:41 UTC|newest]
Thread overview: 35+ 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 [this message]
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
2006-03-06 9:06 ` Helge Hafting
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
2006-03-08 15:30 ` Linus Torvalds
2006-03-05 2:04 ` Michael Buesch
[not found] <5Ml19-2Ki-19@gated-at.bofh.it>
[not found] ` <5MlO0-3JU-13@gated-at.bofh.it>
[not found] ` <5MCF0-2TS-27@gated-at.bofh.it>
[not found] ` <5MITJ-2l4-15@gated-at.bofh.it>
[not found] ` <5NXxl-6WZ-9@gated-at.bofh.it>
[not found] ` <5NY0h-7wa-1@gated-at.bofh.it>
2006-03-11 1:19 ` Robert Hancock
2006-03-12 18:09 ` Alan Cox
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