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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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