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mm: remove PageWriteback

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The last caller of PageWriteback() was removed in commit f75987e543
("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.

Link: https://lore.kernel.org/20260905-remove-pagewriteback-v1-1-06f41c00db03@columbia.edu
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SJ Park <sj@kernel.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
This commit is contained in:
Tal Zussman 2026-09-05 15:08:30 -04:00 committed by Andrew Morton
parent a85a8d0327
commit 9ea9dc1606
1 changed files with 2 additions and 2 deletions
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4
include/linux/page-flags.h
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@ -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 */