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The previous expressions were wrong which made free_pmd_range() explode
when using anything other than 4KB pages (which is why 8KB and 64KB
pages were disabled with the 3-level page table layout).
The problem was that pmd_offset() was returning an index of non-zero
when it should have been returning 0. This non-zero offset was used to
calculate the address of the pmd table to free in free_pmd_range(),
which ended up trying to free an object that was not aligned on a page
boundary.
Now 3-level page tables should work with 4KB, 8KB and 64KB pages.
Signed-off-by: Matt Fleming <matt@console-pimps.org>
3f5ab76816