linux-kernel - Re: [PATCH 0/3] Add API for weak DMA masks

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: <20080501155826.GA11188@infradead.org>
Date:	Thu, 1 May 2008 11:58:26 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Michael Buesch <mb@...sch.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	John Linville <linville@...driver.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, bcm43xx-dev@...ts.berlios.de,
	linux-wireless@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Add API for weak DMA masks

On Thu, May 01, 2008 at 05:47:26PM +0200, Michael Buesch wrote:
> We've discussed that and this behaviour is not acceptable, as the driver
> must know about a possible fallback in case it can do 32bit DMA
> more efficiently than 64bit DMA, for example.

That's what we have dma_get_required_mask() for.  See
Documentation/DMA-API.txt.

--
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/