Let's hide those kernel details in enum.
Further in this patches set I'll add kdat test for presence
of "[vdso]" hint after mremap(), so we will skip any checking
on kernels > v3.16 and do not init vdso_pfn also
(skipping parsing of self-pagemap).
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>