linux-kernel - Re: [PATCH] pci: show dma

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Date:	Fri, 24 Oct 2008 12:50:12 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	Matthew Wilcox <matthew@....cx>, Yinghai Lu <yinghai@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: show dma_mask bits in /sys

Grant Grundler <grundler@...isc-linux.org> writes:

> On Wed, Oct 22, 2008 at 09:28:33PM -0600, Matthew Wilcox wrote:
>> On Wed, Oct 22, 2008 at 06:45:10PM -0700, Yinghai Lu wrote:
>> > Grant prefer to add it /sys instead of showing in bootlog
>> > 
>> > so could catch if the driver set the correct dma_mask.
>> 
>> I still don't think this is useful information to be exposing.
>
> It's useful for anyone involved with device drivers - we agree that's
> a very limited subset of users.  I certainly get fed up with trying
> to figure out which dma_mask each driver is using since in some

One simple way that doesn't need any kernel changes is to use
crash on the running kernel. I personally just stuck in printks
when I needed that, but it doesn't strike me as something that 
is generally useful in standard kernels (agreeing with Willy)

-Andi
-- 
ak@...ux.intel.com
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