[PATCH] mm: remove PageWriteback

[Tal Zussman]

The last caller of PageWriteback() was removed in commit f75987e543c2
("libceph: remove pinning assertion in ceph_msg_data_iter_next()").
This flag is now only used on folios, so we can remove all the page
accessors. folio_test_clear_writeback() is not used, so don't add
FOLIO_TEST_CLEAR_FLAG() for it.

Signed-off-by: Tal Zussman <tz2294@xxxxxxxxxxxx>
---
 include/linux/page-flags.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 3dc79c0c5adf..86dd0470da11 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -588,8 +588,8 @@ FOLIO_FLAG(owner_2, FOLIO_HEAD_PAGE)
  * Only test-and-set exist for PG_writeback.  The unconditional operators are
  * risky: they bypass page accounting.
  */
-TESTPAGEFLAG(Writeback, writeback, PF_NO_TAIL)
-	TESTSCFLAG(Writeback, writeback, PF_NO_TAIL)
+FOLIO_TEST_FLAG(writeback, FOLIO_HEAD_PAGE)
+	FOLIO_TEST_SET_FLAG(writeback, FOLIO_HEAD_PAGE)
 FOLIO_FLAG(mappedtodisk, FOLIO_HEAD_PAGE)
 
 /* PG_readahead is only used for reads; PG_reclaim is only for writes */

---
base-commit: b733fe31e781ed45c56d2ec561dbb61a903693c8
change-id: 20260904-remove-pagewriteback-69d2aa5b3ee9

Best regards,
--  
Tal Zussman <tz2294@xxxxxxxxxxxx>