Hi,
inside of a kernel module, I need to re-map a part of a processes'
virtual address space (usually from the heap) to a range of physically
contiguous page frames that another kernel module provides me with (I
get a kernel virtual address to the beginning of the first page frame).
I tried remap_pfn_range(), but as Copy-on-Write is used for the heap's
vma, remap_pfn_range() refuses to do the mapping, because I only want to
re-map some part of the vma, not the whole thing.
Then I tried to use vm_insert_page() for each individual physical page,
but as the count is 0 for these pages, this is refused, too.
I can't use split_vma() to split the heap's vma twice and then use
remap_pfn_range() for the vma that represents the part that is to be
re-mapped, because split_vma() isn't supposed to be called from inside a
module, right?
Is there anything I can do about this?
Thanks in advance
Boris
--
| _ RWTH | Boris Bierbaum
|_|_`_ | Lehrstuhl fuer Betriebssysteme
| |_) _ | RWTH Aachen D-52056 Aachen
|_)(_` | Tel: +49-241-80-27805
._) | Fax: +49-241-80-22339
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