At Fri, 12 Jan 2007 17:37:05 +0000, Breton M. Saunders wrote: > > Folks, > > I've got a problem in allocating DMA memory on ARM for a driver on 2.6.19: > > The function snd_malloc_dev_pages requests memory using the > dma_alloc_coherent function on line 222 of sound/core/memalloc.c. This > allocation is done with the bit __GFP_COMP set, which throws an oops in > the ARM memory allocation __dma_alloc. My understanding from speaking > with Russell King is that __GFP_COMP should never be specified when > calling dma_alloc_coherent. > > Is this a bug? Well, this is really a long-standing problem. __GFP_COMP is required for other architectures, but not for ARM. Also, the mmap should be done dma_mmap_coherent() on ARM instead of vm nopage callback. In short, we need: - an offical allocation method of mmappable coherent dma memory and - an API for mmapping such area. Takashi ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
