Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() bycheck_readable_bytes()

[Alan Cox]

> On MMUless you wouldn't use page protection as a GC technique :-)
> Is EFAULT really optional on systems with page protection?

Yes.

It's also not guaranteed under Linux although pretty much all our I/O
paths do bother to report -EFAULT

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