On Mon, Oct 17, 2011 at 11:00:55AM -0500, Kumar Gala wrote: > > On Oct 14, 2011, at 1:31 PM, Hans J. Koch wrote: > > > On Thu, Oct 13, 2011 at 10:50:58AM -0500, Kumar Gala wrote: > >> From: Kai Jiang <kai.ji...@freescale.com> > >> > >> To support >32-bit physical addresses for UIO_MEM_PHYS type we need to > >> extend the width of 'addr' in struct uio_mem. Numerous platforms like > >> embedded PPC, ARM, and X86 have support for systems with larger physical > >> address than logical. > >> > >> Since 'addr' may contain a physical, logical, or virtual address the > >> easiest solution is to just change the type to 'phys_addr_t' which > >> should always be greater than or equal to the sizeof(void *) such that > >> it can properly hold any of the address types. > >> > >> For physical address we can support up to a 44-bit physical address on a > >> typical 32-bit system as we utilize remap_pfn_range() for the mapping of > >> the memory region and pfn's are represnted by shifting the address by > >> the page size (typically 4k). > >> > >> Signed-off-by: Kai Jiang <kai.ji...@freescale.com> > >> Signed-off-by: Minghuan Lian <minghuan.l...@freescale.com> > >> Signed-off-by: Kumar Gala <ga...@kernel.crashing.org> > > > > Signed-off-by: "Hans J. Koch" <h...@hansjkoch.de> > > > > That looks good to me. There's an unnecessary cast (see below), but I fixed > > that > > on the way. > > > > Greg, please pull this from branch uio-for-gregkh from > > > > git://hansjkoch.de/git/linux-hjk > > > > Thanks, > > Hans > > I think removing that cast is wrong: > > drivers/uio/uio.c: In function 'uio_vma_fault': > drivers/uio/uio.c:637:26: warning: cast to pointer from integer of different > size
Hmm, on what platform did you see this? I tested on 32bit-x86 and didn't get any warnings. Hans _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
