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    SubjectRe: [openib-general] Re: [PATCH] arch/xx/pci: remap_pfn_range -> io_remap_pfn_range
    On Thu, Jul 28, 2005 at 12:57:51PM +0100, Ian Pratt wrote:
    > > > 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.

    I agree, but not for i386, which is what the patch was trying to change.

    If this is a fix for xen, fine, then say so in the changelog information
    for the patch, as it is, no such information was given.


    greg k-h
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      Last update: 2005-07-28 18:26    [W:0.031 / U:87.188 seconds]
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