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[128.59.179.57]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9397f9ee9fbsm503659285a.1.2026.09.05.12.09.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Sep 2026 12:09:10 -0700 (PDT) From: Tal Zussman Date: Sat, 05 Sep 2026 15:08:30 -0400 Subject: [PATCH] mm: remove PageWriteback Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260905-remove-pagewriteback-v1-1-06f41c00db03@columbia.edu> X-B4-Tracking: v=1; b=H4sIAK1onGoC/yXMQQ6CMBBG4auQWdukViCpVzEupuUHRyOQKQIJ4 e5UXX6L9zZKUEGia7GRYpYkQ59xPhUUH9x3MNJkk7Outt6WRvEeZpiROywqEwLHl6l945ircAE 85XRUtLL+trf73+kTnojT90X7fgC0TKzPeAAAAA== X-Change-ID: 20260904-remove-pagewriteback-69d2aa5b3ee9 To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Matthew Wilcox Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Tal Zussman X-Mailer: b4 0.17-dev-db0b7 X-Developer-Signature: v=1; a=ed25519-sha256; t=1788635349; l=1311; i=tz2294@columbia.edu; s=20250528; h=from:subject:message-id; bh=Knzv4nLdf0CUhDUXi+3uKsDl+EcnYVChUNre7uBmQOk=; b=eSGJ7KvLBuBnBC9GvLvaZ45PuNk7Tw6MDSd+SKqd40OqhXVY2UdADAnpZcwBTqAFfH1PJfje3 4D+ts/JGrQ4BLGyJvAQoSROOEECXYnmRgGITfyuMI4bvE/bkvMKiI44 X-Developer-Key: i=tz2294@columbia.edu; a=ed25519; pk=BIj5KdACscEOyAC0oIkeZqLB3L94fzBnDccEooxeM5Y= X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA1MDIxMyBTYWx0ZWRfX8F8ACNanKZvl FVowSDfb0KvfNgsD684gRMpvnPt2TxYhiUBdbiZlx/DpNXEIgHymSGSutFcOePFyF78DFSziStI cVDgoEBW732hBQXWreh3FNBzXhEQYNwfPZaMrxTWAjKX6Ld0xfC3 X-Authority-Analysis: v=2.4 cv=QMFYgALL c=1 sm=1 tr=0 ts=6a9c68d8 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=Qh9WKzuy3vK2roC+qB/eOQ==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=x7bEGLp0ZPQA:10 a=A0y_DWxS2BwA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Da8U98TiO7q1upZEImrf:22 a=svvvyxlR1OQQkelhaPoB:22 a=Z08UwzbLghVimfrVTBAA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-GUID: HZ_YDmzydQdKgs4ThBadcdgze2rG8Xty X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA1MDIxMyBTYWx0ZWRfXwhLTFITWoekS 6AJ+Cyk5dSWo2WDbIJcRopJkao6+I3nb/NvL9hwoGaQyzNImsZHKQGtByO+UXdd46SENv5oQ1Qe qYVeSpunGATfkAV8V8hKCCqzSgRAHbPL8WbZ90ODVoNY3hsOv0cB48ePPyLAfmgSajo14Ggj3sm ZhGfywp+hZddS5aG/gXxXh8O0L35ZAOM69PbAna0HlwMOZznDFlpw4etmEJL8lLTzrYUDoPTRH/ whsG2e7PEVsKFkQZprDxnQZPtvt054VHlHeyPGMDWT5LiNL22ESpct+f0inxP72w5btzVG0PzV5 sxuvvXACRf5xGgCKTObXfEHVNsruHa9V6325Uy4FiXvfe6A2ZEVBeOILQI/6wnJCVQKUEBwN9PD 7kwd8vRlQ7GA4U3C9q6jzzf7f95EBf2j8danSnWYSiBMY73aAijB4OFl83uVUVI/oprryM97oX2 AIT5B5B55psQYlo2wPg== X-Proofpoint-ORIG-GUID: HZ_YDmzydQdKgs4ThBadcdgze2rG8Xty X-Proofpoint-Virus-Version: vendor=nai engine=6900 definitions=11897 signatures=596817 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=10 lowpriorityscore=10 spamscore=0 adultscore=0 bulkscore=10 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609050213 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 Acked-by: David Hildenbrand (Arm) Reviewed-by: Lorenzo Stoakes (ARM) Reviewed-by: SJ Park --- 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) =20 /* PG_readahead is only used for reads; PG_reclaim is only for writes */ --- base-commit: b733fe31e781ed45c56d2ec561dbb61a903693c8 change-id: 20260904-remove-pagewriteback-69d2aa5b3ee9 Best regards, -- =20 Tal Zussman