Messages in this thread |  | | Date | Fri, 27 Nov 2009 09:36:06 +0100 | | From | Takashi Iwai <> | | Subject | Re: snd_usb_audio OOPS on MIPSEL - is that the mmap issue? |
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At Thu, 26 Nov 2009 18:15:54 +0000, Ralf Baechle wrote: > > 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.
Yes. Thanks for clarification!
Takashi
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