How to mmap kernel memory area to userspace ?

[Valdis.Kletnieks at vt.edu]

On Tue, 19 Aug 2014 17:54:14 +0800, lxgeek said:
>        I want to mmap a kernel memory area which sk_buf->data pointer
> into userspace. I want to do this , because this way can reduce a copy
> from kernel to userspace.
>        How to fix it? Or, which book or project can help me ?

Look at how other drivers do zero-copy.  Hint: mmap is probably not
the best way to approach it, because that would require userspace to
do something different to use it.
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