Ralf Baechle <ralf@xxxxxxxxxxxxxx> writes: Hi, > On Tue, Dec 09, 2008 at 07:17:13PM +0100, Arnaud Patard wrote: > >> What about things like _CACHE_UNCACHED_ACCELERATED ? Is there a way to >> use this flag ? > > That's possible but will require some additional care in the code. > Multiple mappings using different cache modes need to be avoided and > also not all processors support _CACHE_UNCACHED_ACCELERATED. well, for that, one can always define a Kconfig entry for that. It would be usefull for using _CACHE_UNCACHED_ACCELERATED in fb_pgprotect in asm/fb.h too. > > If you know your software is playing nice and your CPU supports > _CACHE_UNCACHED_ACCELERATED, you can hack the mmap function to use > _CACHE_UNCACHED_ACCELERATED if write_combine is set. Just for now > and for something which I'm planning to push for 2.6.28 I don't want > anything that's more than trivial. Ok, no problem. I'm only asking if it will be possible to use it. For now, I don't have the pci_mmap_page_range requirement on my systems. Thanks, Arnaud
