Re: [PATCH v14 010/138] mm: Add folio flag manipulation functions

Mike Rapoport
2021-07-20T10:53:35Z

On Thu, Jul 15, 2021 at 04:34:56AM +0100, Matthew Wilcox (Oracle) wrote:
> These new functions are the folio analogues of the various PageFlags
> functions. If CONFIG_DEBUG_VM_PGFLAGS is enabled, we check the folio
> is not a tail page at every invocation. This will also catch the
> PagePoisoned case as a poisoned page has every bit set, which would
> include PageTail.
>
> This saves 1684 bytes of text with the distro-derived config that
> I'm testing due to removing a double call to compound_head() in
> PageSwapCache().
>
> 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 <kirill.shutemov@linux.intel.com>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
> Reviewed-by: David Howells <dhowells@redhat.com>
> ---
> include/linux/page-flags.h | 219 ++++++++++++++++++++++++++-----------
> 1 file changed, 156 insertions(+), 63 deletions(-)

Acked-by: Mike Rapoport <rppt@linux.ibm.com>