At Tue, 17 Nov 2009 00:48:14 +0800, Wu Zhangjin wrote: > > Hi, All > > Seems this is MIPS specific, but it's not that easy to move this patch > into the arch/mips part, So, any better solution? Actually, this has been a looong-standing problem. I have a series of patches to fix these issues, but it's more intensively involved with dma_*() functions. The patches can be found in test/dma-fix branch of sound GIT tree. git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git test/dma-fix This basically adds dma_mmap_coherent() function to feasible architectures, which is already implemented for ARM, so far. thanks, Takashi