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    SubjectRe: [patch 2/2] mspec driver
    Jes Sorensen wrote:
    >>>>>>"Nick" == Nick Piggin <nickpiggin@yahoo.com.au> writes:
    >
    >
    > Nick> Jes Sorensen wrote:
    >
    >>>+ vma->vm_flags |= (VM_IO | VM_LOCKED | VM_RESERVED | VM_PFNMAP);
    >
    >
    > Nick> VM_PFNMAP actually has a fairly specific meaning [unlike the
    > Nick> rest of them :)] so you should be careful with it. Actually if
    > Nick> you set vm_pgoff in the right way, then that should enable you
    > Nick> to do COWs on these areas if that is what you want.
    >
    > Yup, I went through that when I started using it. I think you guided
    > me through it :-)
    >
    > We don't want COW here as the access is backed by special behavior in
    > the memory controller. We only allow shared mappings for that reason.
    >

    No problem, I think you should just stop using the VM_PFNMAP flag then.
    [Linus should jump in here if I'm wrong ;)]

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