At Mon, 16 Nov 2009 18:06:41 +0100, Ralf Baechle wrote: > > On Tue, Nov 17, 2009 at 12:48:14AM +0800, Wu Zhangjin wrote: > > > Seems this is MIPS specific, but it's not that easy to move this patch > > into the arch/mips part, So, any better solution? > > > > Thanks & Regards, > > Wu Zhangjin > > > > ------------------------ > > > > The user application mmap audio dma regions must be dma-coherent. This > > patch fix it. > > > > Without this patch, artsd will fail on boot, and mplayer will exit with > > "Segmentation fault". (this happens on YeeLoong netbook, fuloong2f > > mini pc with snd_cs5535 audio card) > > > > This is originally from the to-mips branch of > > http://dev.lemote.com/code/linux_loongson, and contributed by Yanhua > > from Lemote Inc. > > > > Reported-by: qiaochong <qiaochong@xxxxxxxxx> > > Signed-off-by: Wu Zhangjin <wuzj@xxxxxxxxxx> > > This issue is an old ghost still around, see: > > http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20060124.132832.37533152.nemoto%40toshiba-tops.co.jp > > which is a superset of your proposed patch and which itself is refering to > an even older posting from 2003: > > http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20030523215935.71373.qmail%40web11901.mail.yahoo.com > > The #ifdef'ed solution doesn't cut it for sure. Let's see what better we > can find ... Indeed. My preference option is to deploy dma_mmap_coherent() to possible architectures and use it commonly in the ALSA core code. But, as a temporary workaround, I'm fine with ifdef until the API is defined... thanks, Takashi
