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SubjectRe: ptrace and pfn mappings
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> I think the best idea is to add a new ->access method to the vm_operations
> that's called by access_process_vm() when it exists and VM_IO or VM_PFNMAP
> are set. ->access would take the required object locks and copy out the
> data manually. This should work both for spufs and drm.

Another option is to have access_process_vm() lookup the PTE and lock it
while copying the data from the page.

something like

- lookup pte & lock
- check if pte still present
- copy data to temp kernel buffer
- unlock pte
- copy data to user buffer

Ben.

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