From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: USB transfer_buffer allocations on 64bit systems Date: Mon, 12 Apr 2010 18:29:47 +0200 Message-ID: <20100412162947.GQ18855@one.firstfloor.org> References: <20100412154323.GP18855@one.firstfloor.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Alan Stern Cc: Andi Kleen , Daniel Mack , Pedro Ribeiro , linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Greg KH , alsa-devel@alsa-project.org, linux-usb@vger.kernel.org List-Id: alsa-devel@alsa-project.org 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@linux.intel.com -- Speaking for myself only.