From: Ralf Baechle <ralf@linux-mips.org>
To: Takashi Iwai <tiwai@suse.de>
Cc: wuzhangjin@gmail.com, Andreas Mohr <andi@lisas.de>,
linux-kernel@vger.kernel.org
Subject: Re: snd_usb_audio OOPS on MIPSEL - is that the mmap issue?
Date: Thu, 26 Nov 2009 18:15:54 +0000 [thread overview]
Message-ID: <20091126181554.GB11737@linux-mips.org> (raw)
In-Reply-To: <s5h7htdodov.wl%tiwai@suse.de>
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
next prev parent reply other threads:[~2009-11-26 18:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-25 23:12 snd_usb_audio OOPS on MIPSEL - is that the mmap issue? Andreas Mohr
2009-11-26 1:20 ` Wu Zhangjin
2009-11-26 9:09 ` Takashi Iwai
2009-11-26 9:22 ` Andreas Mohr
2009-11-26 18:15 ` Ralf Baechle [this message]
2009-11-27 8:36 ` Takashi Iwai
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