From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1FE1325CC57; Tue, 8 Sep 2026 20:18:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788898721; cv=none; b=aKE/we/Xv5UxB14YZpBIY9SVpx8mbkr3N4j0L1rLF2bhkr56FokxjflipxbuMF1VcQBsKx2H1ERV/n5ac679i7dijuiv1RZVNsxwx3FkUJFtmmhNIG2wpSzmoKz8BFBjLK6HQPNbgt+2GTxKTU0JJ+Yq19SZYWngOGlUixoaD6A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788898721; c=relaxed/simple; bh=wg6tA2nn+6f1lbuGoW1F+V8Pi2Wvdfqvh3DOyGzlDxk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=BXEWmNgl04Du6+j5SqeIiKgnWkTrSQo+kiX0wmQWIVe2bkHtvtScu2YdWfYnAlwMo5HXt96N+kt2FMQWeZ3nfpLo2FezH1ySiCn6RD7H/H4KYfNF0QPUteOARipamHe9Q9vDDx5RZc8a8V3LA4BO1VoQnd8maU5bqPmMjDLZn14= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Cyp8Sc1T; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Cyp8Sc1T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E3E21F00A3A; Tue, 8 Sep 2026 20:18:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788898719; bh=d3TWxBMlwlg/BAGS9Nv7Cc0TGFLPZ6nzTJBsPZVVy/8=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=Cyp8Sc1T+RmXSRizmkCM77apMQ0zY67JT8PF0wNp+pLX/z82E2W5ee+eDvgVXCusm s4L6sxsPR4WIGnduLmy9OYvIhF6a9Yy1aQffhmAP3svFk6A4xtcPfq2fDY2B9MH+Cb G1uQaKSN8TLLwwUevyOv7FxPFFpcDwzpMHXHu4DbI0KiLL7fZWcf5YKraJLNTekDMv oRsgWuiMY39VZBg64m6WyhvgH1c9LP2WwMBxUjsDBNlabsYbJgBFTC5MJEUPnyoE24 fRYKpSAQlZc16KBFKiPGQQgx/o0ZXMwBrz89FLdq8WhNlMVZJooriOisB+XjcXfMhw 3K0sNcj35wU1Q== From: "Lorenzo Stoakes (ARM)" Date: Tue, 08 Sep 2026 21:01:38 +0100 Subject: [PATCH 34/39] mm: eliminate VMA_SPECIAL_FLAGS check in lru_gen_look_around() Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260908-b4-mmap-prepare-vma-flag-sanify-v1-34-dacf19cce22b@kernel.org> References: <20260908-b4-mmap-prepare-vma-flag-sanify-v1-0-dacf19cce22b@kernel.org> In-Reply-To: <20260908-b4-mmap-prepare-vma-flag-sanify-v1-0-dacf19cce22b@kernel.org> To: Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , David Hildenbrand , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Greg Kroah-Hartman , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Paul Moore , Stephen Smalley , Jaroslav Kysela , Takashi Iwai , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Doug Gilbert , "James E.J. Bottomley" , "Martin K. Petersen" , Jaya Kumar , Simona Vetter , Helge Deller , Sebastian Reichel , John Hubbard , Peter Xu , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Rik van Riel , Harry Yoo , Juri Lelli , Vincent Guittot , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Arnd Bergmann , Muchun Song , Oscar Salvador , "Matthew Wilcox (Oracle)" , Jan Kara , Marc Zyngier , Oliver Upton , Catalin Marinas , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , "David S. Miller" , Andreas Larsson , Alexander Viro , Christian Brauner , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Xu Xin , Chengming Zhou , Michal Hocko , Miklos Szeredi Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-rdma@vger.kernel.org, selinux@vger.kernel.org, linux-sound@vger.kernel.org, bpf@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, "Lorenzo Stoakes (ARM)" X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1176; i=ljs@kernel.org; h=from:subject:message-id; bh=wg6tA2nn+6f1lbuGoW1F+V8Pi2Wvdfqvh3DOyGzlDxk=; b=owGbwMvMwCV2fu7ZrsZH9SKMp9WSGLIWZG6LffC5V7Do08lrkz51pDevaTzF1aQZfHZqXTffp NUblpw931HKwiDGxSArpsjy/Iv4/iCRsHmdF/zdYOawMoEMYeDiFICJfGpiZFhRphmg+WLxFNNF nQLnFdol3sxcKrh8QcHpT88XiM09bS/B8N//+Yk9jk/Xawtt9V6/6N7/Jw8XutlMlTh0yfnBm92 Pzq3iBgA= X-Developer-Key: i=ljs@kernel.org; a=openpgp; fpr=E7F417BF5214569E89D04F46CF9DCD8A81E27F14 A kernel-owned or fixed mapping is one which sets VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT or VMA_DONTEXPAND_BIT, which is precisely what VMA_SPECIAL_FLAGS tests for other than VMA_IO_BIT, which is safe to drop as only kernel-owned mappings may set it. Using these predicates rather than VMA_SPECIAL_FLAGS makes the check self-documenting and helps eliminate the confusion around 'special' flags. No functional change intended. Signed-off-by: Lorenzo Stoakes (ARM) --- mm/vmscan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 803754caf4fa..0082afbdbbdd 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4364,8 +4364,8 @@ bool lru_gen_look_around(struct page_vma_mapped_walk *pvmw, unsigned int nr) if (spin_is_contended(pvmw->ptl)) return true; - /* exclude special VMAs containing anon pages from COW */ - if (vma->vm_flags & VM_SPECIAL) + /* exclude kernel-owned and fixed VMAs containing anon pages from COW */ + if (vma_is_kernel_owned(vma) || vma_is_fixed_mapping(vma)) return true; /* avoid taking the LRU lock under the PTL when possible */ -- 2.55.0