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SubjectRe: [patch 2/2] mspec driver
Jes Sorensen wrote:

> +static int
> +mspec_mmap(struct file *file, struct vm_area_struct *vma, int type)

...

> + vma->vm_flags |= (VM_IO | VM_LOCKED | VM_RESERVED | VM_PFNMAP);

VM_PFNMAP actually has a fairly specific meaning [unlike the rest of
them :)] so you should be careful with it. Actually if you set vm_pgoff
in the right way, then that should enable you to do COWs on these areas
if that is what you want.

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