> layer how complicates it oevrmuch for little gain. The generated code was
> fairly horrible when everything checked the 4M bit in the PMD (it's
> actualy in the pgd, but I used the pmd macros to clean up the conceptual
> idea).
i think the check could be done within pmd_bad() [pgd_bad()] conditions,
which branches already exist for all relevant cases. Thus the code path
would not differ for normal mappings.
> This is pretty non-negotiable, especially if you ever expect to be able to
> back-port any chages like this into 2.2.x.
yep.
-- mingo
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