linux-kernel - Re: [PATCH] dma-debug: disable DMA_API

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: <20090613173451.GB18638@8bytes.org>
Date:	Sat, 13 Jun 2009 19:34:51 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	Joerg Roedel <joerg.roedel@....com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...e.hu,
	lethal@...ux-sh.org, hancockrwd@...il.com, jens.axboe@...cle.com,
	bharrosh@...asas.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH] dma-debug: disable DMA_API_DEBUG for now

On Sat, Jun 13, 2009 at 04:26:06PM +0200, Torsten Kaiser wrote:
> On Sat, Jun 13, 2009 at 1:10 PM, Joerg Roedel<joro@...tes.org> wrote:
> >
> > paddr shouldn't matter. We also can't compare against it because it is
> > not a parameter we get in the unmap path (not always).
> 
> check_unmap() checks it and sg_call_ents are also optional.

check_unmap() only checks it for coherent mappings (where it makes
sense). But for a best-fit search it does not make sense because we
already check for the type and multiple coherent mappings to the same
dma_addr for the same device are not possible (because for coherent
mappings the memory is allocated by the dma_ops backend).

Joerg
--
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/