Messages in this thread |  | | Date | Thu, 26 Nov 2009 18:15:54 +0000 | | From | Ralf Baechle <> | | Subject | Re: snd_usb_audio OOPS on MIPSEL - is that the mmap issue? |
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On Thu, Nov 26, 2009 at 10:09:04AM +0100, Takashi Iwai wrote:
> I guess it won't, because usb audio driver provides its own page > callback. It uses vmalloced buffer as the primary buffer, then > copies to the urb transfer buffer. So, mmap should work as long as > the page returned from vmalloc_to_page() can be mapped.
You mean mapping a page that is mapped to the vmalloc area of the kernel also to userland? That's a fairly safe way to create cache aliases on those platforms that suffer from them.
Ralf
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