Messages in this thread |  | | | Date | Sat, 18 Mar 2006 01:09:04 +1100 | | From | Nick Piggin <> | | Subject | Re: [patch 2/2] mspec driver |
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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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