Hello Ingo,
I've found that after allocation failures pmd_alloc() just returns NULL
without setting up a pointer to the "bad page" in upper level directory (as
pte_alloc does). I'm not sure if pointing to the "bad page" is necessary
(most callers handle pXX_alloc() failures correctly), but it looks at least
inconsistent for me. Moreover, there are rudiments of "bad pmd table" in
arch/i386/init.c.
Could you elaborate if "bad pmd table" was intended to be implemented like
"bad pte table", or the course is to remove the bad pages altogether?
Best regards
Andrey V.
Savochkin
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