From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> PageWaiters is used by PageWriteback and PageLocked (and no other page flags), so it makes sense to use the same codepaths that have already been optimised for PageLocked, even if there's probably no real performance benefit to be had. v2: Rebased to 5.7-rc1 - Split up patches better - Moved the BUG() from end_page_writeback() to __clear_page_writeback() as requested by Jan Kara. - Converted the BUG() to WARN_ON() - Removed TestClearPageWriteback Matthew Wilcox (Oracle) (5): mm: Remove definition of clear_bit_unlock_is_negative_byte mm: Move PG_writeback into the bottom byte mm: Convert writeback BUG to WARN_ON mm: Use clear_bit_unlock_is_negative_byte for PageWriteback mm: Remove TestClearPageWriteback include/linux/page-flags.h | 8 ++++---- mm/filemap.c | 41 +++++-------------------------------- mm/page-writeback.c | 42 +++++++++++++++++++++++--------------- 3 files changed, 34 insertions(+), 57 deletions(-) -- 2.25.1
