Hi, 2009/6/4 Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>: > On Thu, Jun 04, 2009 at 12:16:04AM +0900, Yoichi Yuasa wrote: >> >> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx> > > a little bit more description what this is all about would be quite > helpful. I also see a problem as there is at least one MIPS machine > (SGI IP28), which doesn't support coherent memory (at least not without > playing dirty games with the memory controller, which in return makes > the machine slow). Some drivers require dma_declare_coherent_memory() (eg. drivers/usb/host/ohci-sm501.c). It is used to driver's local memory allocation with dma_alloc_coherent(). Yoichi
