* Andrew Morton <a...@linux-foundation.org> wrote:
> <reads the code>
>
> Oh. We don't do any checking at all. We're just telling
> userspace programmers "don't do that". hrm. What are
> your thoughts on adding the overlap checks to the kernel?
I have requested such sanity checking in previous review as
well, it has to be made fool-proof for this optimization to
be usable.
Another alternative would be to make this not a transparent
optimization, but a separate API: ioremap_hugepage() or so.
The devices and drivers dealing with GBs of remapped pages
is still relatively low, so they could make explicit use of
the API and opt in to it.
What I was arguing against was to make it a CONFIG_ option:
that achieves very little in practice, such APIs should be
uniformly available.
Thanks,
Ingo
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