> > Greg> Hm, you do realize that io_remap_pfn_range() is the same > > Greg> thing as remap_pfn_range() on i386, right? > > > > Greg> So, why would this patch change anything? > > > > It's not the same thing under Xen. I think this patch > fixes userspace > > access to PCI memory for XenLinux. > > But Xen is a separate arch, and hence, will get different pci > arch specific functions, right? > > In short, what is this patch trying to fix? What is the > problem anyone is seeing with the existing code?
As I understand it, remap_pfn_range should be used for mapping pages that are backed by memory, and io_remap_pfn_range should be used for mapping MMIO regions. There's a distinciton between the two for architectures like Sparc and xen/x86. For example, drivers/char/mem.c uses io_remap_pfn_range for mmap'ing /dev/mem Ian - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
