Re: [PATCH v14 017/138] mm/filemap: Add folio_unlock()

[Mike Rapoport]

On Thu, Jul 15, 2021 at 04:35:03AM +0100, Matthew Wilcox (Oracle) wrote:
> Convert unlock_page() to call folio_unlock().  By using a folio we
> avoid a call to compound_head().  This shortens the function from 39
> bytes to 25 and removes 4 instructions on x86-64.  Because we still
> have unlock_page(), it's a net increase of 16 bytes of text for the
> kernel as a whole, but any path that uses folio_unlock() will execute
> 4 fewer instructions.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> Acked-by: Jeff Layton <jlayton@xxxxxxxxxx>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
> Reviewed-by: David Howells <dhowells@xxxxxxxxxx>
> ---
>  include/linux/pagemap.h |  3 ++-
>  mm/filemap.c            | 29 ++++++++++++-----------------
>  mm/folio-compat.c       |  6 ++++++
>  3 files changed, 20 insertions(+), 18 deletions(-)

Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>