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SubjectRe: mmaping a kernel buffer to user space

Jiri Slaby wrote:
> Guillermo Marcus wrote:
>> Hi Jiri,
>> The fact that it does not works with RAM is well documented in LDD3,
>> pages 430++. It says (and I tested) that remap_xxx_range does not work
>> in this case. They suggest a method using nopage, similar to the one I
>> implement.
> Could somebody confirm, that this still holds?

Apparently this restriction has been removed since 2.6.15 when
VM_PFNMAP flag has been introduced, see commit

Why there's such restriction before 2.6.15, I haven't searched
yet, but any hints would be appreciated.

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