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    SubjectRe: [PATCH v2 03/46] mm: Add kmap_local_folio()
    On Tue, Jun 22, 2021 at 01:15:08PM +0100, Matthew Wilcox (Oracle) wrote:
    > This allows us to map a portion of a folio. Callers can only expect
    > to access up to the next page boundary.
    >
    > Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

    This looks sensible to me:

    Reviewed-by: Christoph Hellwig <hch@lst.de>

    While we're at it: flushing incoherent mappings for use with kmap
    has been a complete mess. I've been trying to fix this with
    kunmap_local_dirty, but that could use another review, as well as a
    folio version probably give that one prime use case of folios is to have
    them mapped into userspace.

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