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Open Source and information security mailing list archives
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Date: Mon, 12 Apr 2010 18:29:47 +0200 From: Andi Kleen <andi@...stfloor.org> To: Alan Stern <stern@...land.harvard.edu> Cc: Andi Kleen <andi@...stfloor.org>, Daniel Mack <daniel@...aq.de>, Pedro Ribeiro <pedrib@...il.com>, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, Greg KH <gregkh@...e.de>, alsa-devel@...a-project.org, linux-usb@...r.kernel.org Subject: Re: USB transfer_buffer allocations on 64bit systems On Mon, Apr 12, 2010 at 12:17:22PM -0400, Alan Stern wrote: > On Mon, 12 Apr 2010, Andi Kleen wrote: > > > > Well, the sound driver itself doesn't care for any of those things, just > > > like any other USB driver doesn't. The USB core itself of the host > > > controller driver should do, and as far as I can see, it does that, yes. > > > > Hmm, still things must go wrong somewhere. Perhaps need some instrumentation > > to see if all the transfer buffers really hit the PCI mapping functions. > > Such a test has already been carried out earlier in this thread: > > http://marc.info/?l=linux-usb&m=127074587029353&w=2 > http://marc.info/?l=linux-usb&m=127076841801051&w=2 > http://marc.info/?l=linux-usb&m=127082890510415&w=2 Hmm, thanks. But things must still go wrong somewhere, otherwise the GFP_DMA32 wouldn't be needed? -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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