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Thu, 5 Jun 2025 08:06:26 +0000 (GMT) From: Hyesoo Yu To: Cc: janghyuck.kim@samsung.com, zhaoyang.huang@unisoc.com, jaewon31.kim@gmail.com, david@redhat.com, Hyesoo Yu , Andrew Morton , Jason Gunthorpe , John Hubbard , Peter Xu , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/1] mm: gup: avoid CMA page pinning by retrying migration Date: Thu, 5 Jun 2025 17:04:30 +0900 Message-ID: <20250605080436.3764686-1-hyesoo.yu@samsung.com> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CMS-MailID: 20250605080626epcas2p16a1005b2d8992296144759d0e4b91cb8 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P cpgsPolicy: CPGSC10-234,Y X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250605080626epcas2p16a1005b2d8992296144759d0e4b91cb8 References: X-Rspamd-Queue-Id: 7861240013 X-Stat-Signature: uht7kj5h7o8rpn6kuo31hzccrohj4ayu X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1749110793-203486 X-HE-Meta: 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 V6BLhhXo uCuVtAFx+w6u60riTb910k6eisv28wuI3SJ7wJn3mx81eX+E1YkVGjsN+FGBBfxeH1hgp X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This patch addresses an issue where longterm GUP requests could inadvertently pin unpinnable pages (such as CMA) when no migratable folios are found. This regression was introduced by commit 1aaf8c122918 ("mm: gup: fix infinite loop within __get_longterm_locked"). This patch fixes the logic to return -EAGAIN when unpinnable pages are detected but no folios could be collected, allowing migration to be retried instead of incorrectly pinning the page. This v3 drops the cleanup patch included in v2, per Andrew Morton's request. It now contains only the regression fix. The cleanup changes will be proposed separately for the 6.17-rc1. Hyesoo Yu (1): mm: gup: avoid CMA page pinning by retrying migration if no migratable page mm/gup.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) -- 2.49.0