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@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <redacted>
Reviewed-by: William Kucharski <redacted>
Reviewed-by: David Howells <dhowells@redhat.com>
---
 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 <redacted>