> * mprotect: No. The difference is at most one additional locked
> instruction for each pte.
Oh, what instruction is that?
> * munmap(anon): No. We must handle delayed accessed anyway (don't call
> free_pages_ok() until flush_tlb_ipi returned). The difference is that we
> might have to perform a second pass to clear any spurious 0x40 bits.
That second pass is what I had in mind.
> * munmap(file): No. Second pass required for correct msync behaviour.
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