From: Kai Jiang Date: Mon, 17 Oct 2011 18:50:20 +0000 (+0200) Subject: uio: Support physical addresses >32 bits on 32-bit systems X-Git-Tag: v3.2-rc1~184^2~7 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27a90700a4275c5178b883b65927affdafa5185c;p=pandora-kernel.git uio: Support physical addresses >32 bits on 32-bit systems 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 Signed-off-by: Minghuan Lian Signed-off-by: Kumar Gala Signed-off-by: Hans J. Koch Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed