tlb_batch_add_one()

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There seems to be some disagreement about how the hugepage state is
passed into tlb_batch_add().  It's declared as an integer shift, but
there are call sites that pass it in the old way, as a boolean.

For example, all of the call sites in tlb_batch_pmd_scan(), which
likely should be passing PAGE_SHIFT.  Passing true or false in these
spots can't be right.

I also noticed that there appears to be generic support for handling
the need to flush on page size changes during tlb batching, have
a look at __tlb_remove_page_size(), and the new arch overridable
hook tlb_remove_check_page_size_change().

Thanks.
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