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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87zlku8dy3.fsf@basil.nowhere.org>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/