From: Matthew Wilcox <matthew@wil.cx>
To: Yinghai Lu <yinghai@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
grundler@parisc-linux.org, mingo@elte.hu, tglx@linutronix.de,
hpa@zytor.com, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org
Subject: Re: [PATCH] pci: print out DMA mask info
Date: Fri, 10 Oct 2008 10:33:51 -0600 [thread overview]
Message-ID: <20081010163350.GF25780@parisc-linux.org> (raw)
In-Reply-To: <86802c440810100919xf79f406x403988da7988edc9@mail.gmail.com>
On Fri, Oct 10, 2008 at 09:19:08AM -0700, Yinghai Lu wrote:
> anyway looking at dma_mask print out is interesting..., some uses 39,
> and some use 44bits...
Yes, that reflects the limitations of the device. You can see many of
the common ones in include/linux/dma-mapping.h.
By the way, commit 8f286c33f1e838d631f4a3260b33efce4bc5973c is a really
bad idea. It is very helpful to see which bitmasks are used by real
devices, and which ones aren't. It should be reverted, IMO.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2008-10-10 16:34 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-08 23:02 [PATCH] pci: print out DMA mask info Yinghai Lu
2008-10-09 21:18 ` Grant Grundler
2008-10-09 21:27 ` Yinghai Lu
2008-10-09 21:35 ` Matthew Wilcox
2008-10-09 21:51 ` Yinghai Lu
2008-10-09 22:55 ` Grant Grundler
2008-10-09 23:05 ` Yinghai Lu
2008-10-10 2:40 ` FUJITA Tomonori
2008-10-10 4:56 ` Yinghai Lu
2008-10-10 6:08 ` FUJITA Tomonori
2008-10-10 6:32 ` Yinghai Lu
2008-10-10 7:32 ` FUJITA Tomonori
2008-10-12 7:16 ` Grant Grundler
2008-10-10 22:45 ` Grant Grundler
2008-10-14 6:50 ` FUJITA Tomonori
2008-10-12 7:11 ` Grant Grundler
2008-10-23 1:45 ` [PATCH] pci: show dma_mask bits in /sys Yinghai Lu
2008-10-23 3:28 ` Matthew Wilcox
2008-10-23 4:19 ` Yinghai Lu
2008-10-23 6:44 ` Grant Grundler
2008-10-23 8:38 ` Rolf Eike Beer
2008-10-23 15:39 ` Greg KH
2008-10-23 18:37 ` H. Peter Anvin
2008-10-23 19:36 ` Grant Grundler
2008-10-23 19:49 ` Greg KH
2008-10-24 10:50 ` Andi Kleen
2008-11-01 17:10 ` Grant Grundler
2008-10-23 6:48 ` Grant Grundler
2008-10-23 6:51 ` Yinghai Lu
2008-10-23 19:28 ` Grant Grundler
2008-10-10 2:40 ` [PATCH] pci: print out DMA mask info FUJITA Tomonori
2008-10-10 2:59 ` FUJITA Tomonori
2008-10-10 2:40 ` FUJITA Tomonori
2008-10-10 15:48 ` Jesse Barnes
2008-10-10 16:19 ` Yinghai Lu
2008-10-10 16:28 ` Jesse Barnes
2008-10-10 16:33 ` Matthew Wilcox [this message]
2008-10-10 16:46 ` Yinghai Lu
2008-10-10 17:12 ` Matthew Wilcox
2008-10-10 17:18 ` Roland Dreier
2008-10-12 7:38 ` Grant Grundler
2008-10-12 7:20 ` Grant Grundler
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