From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Adam J. Richter" <adam@yggdrasil.com>
Cc: manfred@colorfulllife.com, dvaid-b@pacbell.net,
James.Bottomley@steeleye.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFT][PATCH] generic device DMA implementation
Date: 30 Dec 2002 00:45:54 +0000 [thread overview]
Message-ID: <1041209155.1215.3.camel@irongate.swansea.linux.org.uk> (raw)
In-Reply-To: <200212280339.TAA25950@adam.yggdrasil.com>
On Sat, 2002-12-28 at 03:39, Adam J. Richter wrote:
> I know Documentation/DMA-mapping.txt says that, and I
> understand that wmb() is necessary with consistent memory, but I
> wonder if rmb() really is, at least if you've declared the data
> structures in question as volatile to prevent reordering of reads by
> the compiler.
Compiler ordering != Processor to memory ordering != PCI device view
ordering
volatile may not be enough.
Alan
next prev parent reply other threads:[~2002-12-29 23:56 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-28 3:39 Adam J. Richter
2002-12-30 0:45 ` Alan Cox [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-12-28 22:19 Adam J. Richter
2002-12-30 23:23 ` David Brownell
2002-12-28 20:11 Adam J. Richter
2002-12-28 15:41 Adam J. Richter
2002-12-28 16:59 ` David Brownell
2002-12-28 2:48 Adam J. Richter
2002-12-28 15:05 ` David Brownell
2002-12-27 22:57 Manfred Spraul
2002-12-27 23:55 ` James Bottomley
2002-12-28 0:20 ` Manfred Spraul
2002-12-28 16:26 ` James Bottomley
2002-12-28 17:54 ` Manfred Spraul
2002-12-28 18:13 ` James Bottomley
2002-12-28 18:25 ` Manfred Spraul
2002-12-28 18:40 ` James Bottomley
2002-12-28 20:05 ` Manfred Spraul
2002-12-27 20:21 David Brownell
2002-12-27 21:40 ` James Bottomley
2002-12-28 1:29 ` David Brownell
2002-12-28 16:18 ` James Bottomley
2002-12-28 18:16 ` David Brownell
2002-12-28 1:56 ` David Brownell
2002-12-28 16:13 ` James Bottomley
2002-12-28 17:41 ` David Brownell
2002-12-27 21:47 ` James Bottomley
2002-12-28 2:28 ` David Brownell
2002-12-18 3:01 James Bottomley
2002-12-18 3:13 ` David Mosberger
2002-12-28 18:14 ` Russell King
2002-12-28 18:19 ` James Bottomley
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