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Sat, 17 Jan 2026 00:26:58 +0800 From: Baolin Wang To: baolin.wang@linux.alibaba.com Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, baohua@kernel.org, catalin.marinas@arm.com, david@kernel.org, dev.jain@arm.com, harry.yoo@oracle.com, jannh@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, riel@surriel.com, rppt@kernel.org, ryan.roberts@arm.com, surenb@google.com, vbabka@suse.cz, will@kernel.org, willy@infradead.org Subject: [PATCH] mm: rmap: skip batched unmapping for UFFD vmas Date: Sat, 17 Jan 2026 00:26:52 +0800 Message-ID: <20260116162652.176054-1-baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <142919ac14d3cf70cba370808d85debe089df7b4.1766631066.git.baolin.wang@linux.alibaba.com> References: <142919ac14d3cf70cba370808d85debe089df7b4.1766631066.git.baolin.wang@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 3894C180005 X-Stat-Signature: qdikxzr1rqhmnf6darhyjhcu976jzd7e X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1768580823-388862 X-HE-Meta: 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 8AWNSS+2 2dtqhe1VyXdgeSKkF6zGcE0iARMqNLFH33A+8xQLuWvBtUCUA7X2xrS3VXHoSHREx2nv1GqfmiOCaS84IWdt2ieQcrcYtSZnrMiY7tLldRmedNxP+zhGnlQgrfWIRsgmibmeGpiYypbFInUyJ0xRcPfuvIZiPBlz6qg2GpTR3zl2UYkuz5AMKy9cochkgtu5Uwj8N1bEnSmc2ISJhAITGs4ezZAskrvA3PRk5ZY1JTUJS85n9OF5/JnBBcdil0gkOOaCyYeTNKempIaC6V73yS0OMs5J985OIlq4VDVat7k5LRg7bRVrqX7T4aAAB/sMG/KBZF1d6+/AvrUM= 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: As Dev reported[1], it's not ready to support batched unmapping for uffd case. Let's still fallback to per-page unmapping for the uffd case. [1] https://lore.kernel.org/linux-mm/20260116082721.275178-1-dev.jain@arm.com/ Reported-by: Dev Jain Suggested-by: Barry Song Signed-off-by: Baolin Wang --- mm/rmap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/rmap.c b/mm/rmap.c index f13480cb9f2e..172643092dcf 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1953,6 +1953,9 @@ static inline unsigned int folio_unmap_pte_batch(struct folio *folio, if (pte_unused(pte)) return 1; + if (userfaultfd_wp(vma)) + return 1; + return folio_pte_batch(folio, pvmw->pte, pte, max_nr); } -- 2.47.3