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authorKai Jiang <Kai.Jiang@freescale.com>2011-10-17 20:50:20 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-10-18 20:18:57 +0200
commit27a90700a4275c5178b883b65927affdafa5185c (patch)
treed140a0c39bc0bf68531a165e0678be58987d2d78 /block
parentsysfs: add unsigned long cast to prevent compile warning (diff)
downloadlinux-27a90700a4275c5178b883b65927affdafa5185c.tar.xz
linux-27a90700a4275c5178b883b65927affdafa5185c.zip
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 <Kai.Jiang@freescale.com> Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Hans J. Koch <hjk@hansjkoch.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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