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mm/page-flags: remove folio_start_writeback_keepwrite()

Commit cd57b77197a4 ("ext4: Convert ext4_bio_write_page() to use a folio)
removed set_page_writeback_keepwrite() which was the last/only caller of
folio_start_writeback_keepwrite().

Link: https://lkml.kernel.org/r/20250722182230.2114587-1-joannelkoong@gmail.com
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Joanne Koong and committed by
Andrew Morton d171b10b b50e3788

-2
-2
include/linux/page-flags.h
··· 837 837 838 838 #define folio_start_writeback(folio) \ 839 839 __folio_start_writeback(folio, false) 840 - #define folio_start_writeback_keepwrite(folio) \ 841 - __folio_start_writeback(folio, true) 842 840 843 841 static __always_inline bool folio_test_head(const struct folio *folio) 844 842 {