Re: [PATCH v2 03/46] mm: Add kmap_local_folio()
From: Christoph Hellwig
Date: Wed Jun 23 2021 - 04:00:09 EST
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@xxxxxxxxxxxxx>
This looks sensible to me:
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
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.