From 6baa8d602e84d97a7541ed94ccaeb6a3f9763111 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Thu, 4 Mar 2021 10:21:02 -0500 Subject: [PATCH] mm/filemap: Add folio_wait_locked() Also add folio_wait_locked_killable(). Turn wait_on_page_locked() and wait_on_page_locked_killable() into wrappers. This eliminates a call to compound_head() from each call-site, reducing text size by 193 bytes for me. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Acked-by: Jeff Layton Acked-by: Kirill A. Shutemov Acked-by: Vlastimil Babka Reviewed-by: William Kucharski Reviewed-by: David Howells Acked-by: Mike Rapoport --- include/linux/pagemap.h | 26 ++++++++++++++++++-------- mm/filemap.c | 4 ++-- 2 files changed, 20 insertions(+), 10 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 5b5e8bd..77dbb7f 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -732,23 +732,33 @@ extern void wait_on_page_bit(struct page *page, int bit_nr); extern int wait_on_page_bit_killable(struct page *page, int bit_nr); /* - * Wait for a page to be unlocked. + * Wait for a folio to be unlocked. * - * This must be called with the caller "holding" the page, - * ie with increased "page->count" so that the page won't + * This must be called with the caller "holding" the folio, + * ie with increased "page->count" so that the folio won't * go away during the wait.. */ +static inline void folio_wait_locked(struct folio *folio) +{ + if (folio_test_locked(folio)) + wait_on_page_bit(&folio->page, PG_locked); +} + +static inline int folio_wait_locked_killable(struct folio *folio) +{ + if (!folio_test_locked(folio)) + return 0; + return wait_on_page_bit_killable(&folio->page, PG_locked); +} + static inline void wait_on_page_locked(struct page *page) { - if (PageLocked(page)) - wait_on_page_bit(compound_head(page), PG_locked); + folio_wait_locked(page_folio(page)); } static inline int wait_on_page_locked_killable(struct page *page) { - if (!PageLocked(page)) - return 0; - return wait_on_page_bit_killable(compound_head(page), PG_locked); + return folio_wait_locked_killable(page_folio(page)); } int put_and_wait_on_page_locked(struct page *page, int state); diff --git a/mm/filemap.c b/mm/filemap.c index 655145d..b17b58c 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1704,9 +1704,9 @@ int __lock_page_or_retry(struct page *page, struct mm_struct *mm, mmap_read_unlock(mm); if (flags & FAULT_FLAG_KILLABLE) - wait_on_page_locked_killable(page); + folio_wait_locked_killable(folio); else - wait_on_page_locked(page); + folio_wait_locked(folio); return 0; } if (flags & FAULT_FLAG_KILLABLE) { -- 2.7.4