[alsa-devel] USB transfer_buffer allocations on 64bit systems

Andi Kleen andi at firstfloor.org
Mon Apr 12 18:29:47 CEST 2010

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?


ak at linux.intel.com -- Speaking for myself only.

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