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SubjectRe: [PATCH v7 2/8] iov_iter: Add a function to extract a page list from an iterator
On Fri, Jan 20, 2023 at 05:55:50PM +0000, David Howells wrote:
> (3) Any other sort of iterator.
>
> No refs or pins are obtained on the page, the assumption is made that
> the caller will manage page retention. ITER_ALLOW_P2PDMA is not
> permitted.

The ITER_ALLOW_P2PDMA check here is fundamentally wrong and will
break things like io_uring to fixed buffers on NVMe. ITER_ALLOW_P2PDMA
should strictly increase the group of acceptable iters, it does must
not restrict anything.

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