Messages in this thread | | | Subject | Re: [patch 2/2] mspec driver | From | Jes Sorensen <> | Date | 17 Mar 2006 09:04:10 -0500 |
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>>>>> "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.
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