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Open Source and information security mailing list archives
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Date: Mon, 06 Aug 2007 16:35:25 -0600 From: Robert Hancock <hancockr@...w.ca> To: Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: Stefan Richter <stefanr@...6.in-berlin.de>, Olaf Hering <olh@...e.de>, linuxppc-dev@...abs.org, stable@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping" Benjamin Herrenschmidt wrote: > On Mon, 2007-08-06 at 16:25 -0600, Robert Hancock wrote: >>> Anyway. For now I will simply go with what 2.6.23-rc has and what >>> 2.6.21 had: No dma_set_mask anywhere in the 1394 subsystem. We can >>> revisit this whenever an actual need arises. >> Not sure this is a very good idea. This seems rather likely to fail on >> x86_64 machines with >4GB of RAM for example.. > > Would it ? Isn't the default DMA mask for PCI devices set to 32 bits > anyway ? In which case, swiotlb will take care of the matter. > > Cheers, > Ben. Hmm, that's true, yes. Suppose it shouldn't be a problem then. I would agree, though, that sbp2 isn't really the place for setting this, since the DMA mask is presently a property of the device, not of the user.. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@...pamshaw.ca Home Page: http://www.roberthancock.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/
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