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@xxxxxxxxxxxxx> > Reviewed-by: Christoph Hellwig <hch@xxxxxx> > Acked-by: Jeff Layton <jlayton@xxxxxxxxxx> > Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> > Acked-by: Vlastimil Babka <vbabka@xxxxxxx> > Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx> > Reviewed-by: David Howells <dhowells@xxxxxxxxxx> > --- > include/linux/page-flags.h | 219 ++++++++++++++++++++++++++----------- > 1 file changed, 156 insertions(+), 63 deletions(-) Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
