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GET /api/patches/2202522/?format=api
{ "id": 2202522, "url": "http://patchwork.ozlabs.org/api/patches/2202522/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260227200848.114019-2-david@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260227200848.114019-2-david@kernel.org>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260227200848.114019-2-david@kernel.org/", "date": "2026-02-27T20:08:32", "name": "[v1,01/16] mm/madvise: drop range checks in madvise_free_single_vma()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "6bb3e6a310b1ae354d08480aad017afe98a51449", "submitter": { "id": 92023, "url": "http://patchwork.ozlabs.org/api/people/92023/?format=api", "name": "David Hildenbrand (Arm)", "email": "david@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260227200848.114019-2-david@kernel.org/mbox/", "series": [ { "id": 493807, "url": "http://patchwork.ozlabs.org/api/series/493807/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=493807", "date": "2026-02-27T20:08:31", "name": "mm: cleanups around unmapping / zapping", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/493807/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2202522/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2202522/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-17409-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=TykYjpWv;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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a=rsa-sha256; d=lists.ozlabs.org; s=201707;\n\tt=1772222967; c=relaxed/relaxed;\n\tbh=SKaTaYabvIguXZmWNNd+BNDEApRXksbBfmtUQ8fhMNM=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=Y9bYcUdOnnG/j7kaW7c+P+eleHLWvr7uGE90HJ5PYTZVjdarODnmD3lTSH7qXZzEmkPI1jaOukrgkFkre150IMyVpAomOmYWIU3KQCN2JdK2QTERnSjfzaz33gjXsV4ARg0o/gktBhE8hV1U5K239MBHNIWmcIzqbMG+aWjcYdK3oHbQUJfzP0iJWOOaBbrjG38sPARNegggLrpi3YB22Owd+L4RISlecGAKauYh8L/VmCaVZXUUux75yYkYY10onpjPf/iiGoaHHwGL4Sf3cw9VUDfH7zooHtmsDMTTdxfJ/FEqApNT5W11Y23Q4EOXlFKTbiXokqinlLTNFKf4WA==", "ARC-Authentication-Results": "i=1; lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org;\n dkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=TykYjpWv; dkim-atps=neutral;\n spf=pass (client-ip=2600:3c0a:e001:78e:0:1991:8:25;\n helo=sea.source.kernel.org; envelope-from=david@kernel.org;\n receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1772222964;\n\tbh=oTLLv1/LtvCwIvkJbROBPO/znHjTWfNn5494fkK85gk=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=TykYjpWvgGwljpM6p2COuJBm6vVZY9Djvp9ZNM6zX/Mg+sBmes0wCnbQ4WeSfbmW/\n\t SV+IDNBtumzcZhC3ElSbyAiv475EkpQUkxeCLhsWULdxAHfGnT0H335AmzCjAN+dQj\n\t QRAOmuBYMH+Ynj0dVRD7vPT/l9+4APLtjm8nWyekU8kueRKpx8XbFw5ajrTVTYHSCI\n\t fPG3LX2/4RfCF7sYKFaOg85sIPFkNtlXfBAxGEQ4tDcYAx7xhGzd19vCY9jvvC0Ulp\n\t O7aQ9sT3wfiLxfn9cUcpLrszMNdsrZRZprFMOD9AkXLMBxMByussndPeKhWeTlHo/m\n\t zYXuh1oeZiM/A==", "From": "\"David Hildenbrand (Arm)\" <david@kernel.org>", "To": "linux-kernel@vger.kernel.org", "Cc": "\"linux-mm @ kvack . org\" <linux-mm@kvack.org>,\n \"David Hildenbrand (Arm)\" <david@kernel.org>,\n Andrew Morton <akpm@linux-foundation.org>,\n Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,\n \"Liam R. Howlett\" <Liam.Howlett@oracle.com>,\n Vlastimil Babka <vbabka@kernel.org>, Mike Rapoport <rppt@kernel.org>,\n Suren Baghdasaryan <surenb@google.com>, Michal Hocko <mhocko@suse.com>,\n Jann Horn <jannh@google.com>, Pedro Falcato <pfalcato@suse.de>,\n David Rientjes <rientjes@google.com>, Shakeel Butt <shakeel.butt@linux.dev>,\n \"Matthew Wilcox (Oracle)\" <willy@infradead.org>,\n Alice Ryhl <aliceryhl@google.com>, Madhavan Srinivasan <maddy@linux.ibm.com>,\n Michael Ellerman <mpe@ellerman.id.au>,\n Christian Borntraeger <borntraeger@linux.ibm.com>,\n Janosch Frank <frankja@linux.ibm.com>,\n Claudio Imbrenda <imbrenda@linux.ibm.com>,\n Alexander Gordeev <agordeev@linux.ibm.com>,\n Gerald Schaefer <gerald.schaefer@linux.ibm.com>,\n Heiko Carstens <hca@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>,\n Jarkko Sakkinen <jarkko@kernel.org>, Thomas Gleixner <tglx@kernel.org>,\n Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,\n Greg Kroah-Hartman <gregkh@linuxfoundation.org>, =?utf-8?q?Arve_Hj=C3=B8nne?=\n\t=?utf-8?q?v=C3=A5g?= <arve@android.com>, Todd Kjos <tkjos@android.com>,\n Christian Brauner <brauner@kernel.org>, Carlos Llamas <cmllamas@google.com>,\n Ian Abbott <abbotti@mev.co.uk>,\n H Hartley Sweeten <hsweeten@visionengravers.com>,\n Jani Nikula <jani.nikula@linux.intel.com>,\n Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,\n Rodrigo Vivi <rodrigo.vivi@intel.com>, Tvrtko Ursulin <tursulin@ursulin.net>,\n David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,\n Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,\n Dimitri Sivanich <dimitri.sivanich@hpe.com>, Arnd Bergmann <arnd@arndb.de>,\n Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,\n Andrii Nakryiko <andrii@kernel.org>, Peter Zijlstra <peterz@infradead.org>,\n Arnaldo Carvalho de Melo <acme@kernel.org>,\n Namhyung Kim <namhyung@kernel.org>, Andy Lutomirski <luto@kernel.org>,\n Vincenzo Frascino <vincenzo.frascino@arm.com>,\n Eric Dumazet <edumazet@google.com>, Neal Cardwell <ncardwell@google.com>,\n \"David S. Miller\" <davem@davemloft.net>, David Ahern <dsahern@kernel.org>,\n Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,\n Miguel Ojeda <ojeda@kernel.org>, linuxppc-dev@lists.ozlabs.org,\n kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-sgx@vger.kernel.org,\n intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,\n linux-rdma@vger.kernel.org, bpf@vger.kernel.org,\n linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org,\n netdev@vger.kernel.org, rust-for-linux@vger.kernel.org, x86@kernel.org", "Subject": "[PATCH v1 01/16] mm/madvise: drop range checks in\n madvise_free_single_vma()", "Date": "Fri, 27 Feb 2026 21:08:32 +0100", "Message-ID": "<20260227200848.114019-2-david@kernel.org>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260227200848.114019-1-david@kernel.org>", "References": "<20260227200848.114019-1-david@kernel.org>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "madvise_vma_behavior()-> madvise_dontneed_free()->madvise_free_single_vma()\nis only called from madvise_walk_vmas()\n\n(a) After try_vma_read_lock() confirmed that the whole range falls into\n a single VMA (see is_vma_lock_sufficient()).\n\n(b) After adjusting the range to the VMA in the loop afterwards.\n\nmadvise_dontneed_free() might drop the MM lock when handling\nuserfaultfd, but it properly looks up the VMA again to adjust the range.\n\nSo in madvise_free_single_vma(), the given range should always fall into\na single VMA and should also span at least one page.\n\nLet's drop the error checks.\n\nThe code now matches what we do in madvise_dontneed_single_vma(), where\nwe call zap_vma_range_batched() that documents: \"The range must fit into\none VMA.\". Although that function still adjusts that range, we'll change\nthat soon.\n\nSigned-off-by: David Hildenbrand (Arm) <david@kernel.org>\n---\n mm/madvise.c | 13 ++++---------\n 1 file changed, 4 insertions(+), 9 deletions(-)", "diff": "diff --git a/mm/madvise.c b/mm/madvise.c\nindex c0370d9b4e23..efc04334a000 100644\n--- a/mm/madvise.c\n+++ b/mm/madvise.c\n@@ -799,9 +799,10 @@ static int madvise_free_single_vma(struct madvise_behavior *madv_behavior)\n {\n \tstruct mm_struct *mm = madv_behavior->mm;\n \tstruct vm_area_struct *vma = madv_behavior->vma;\n-\tunsigned long start_addr = madv_behavior->range.start;\n-\tunsigned long end_addr = madv_behavior->range.end;\n-\tstruct mmu_notifier_range range;\n+\tstruct mmu_notifier_range range = {\n+\t\t.start = madv_behavior->range.start,\n+\t\t.end = madv_behavior->range.end,\n+\t};\n \tstruct mmu_gather *tlb = madv_behavior->tlb;\n \tstruct mm_walk_ops walk_ops = {\n \t\t.pmd_entry\t\t= madvise_free_pte_range,\n@@ -811,12 +812,6 @@ static int madvise_free_single_vma(struct madvise_behavior *madv_behavior)\n \tif (!vma_is_anonymous(vma))\n \t\treturn -EINVAL;\n \n-\trange.start = max(vma->vm_start, start_addr);\n-\tif (range.start >= vma->vm_end)\n-\t\treturn -EINVAL;\n-\trange.end = min(vma->vm_end, end_addr);\n-\tif (range.end <= vma->vm_start)\n-\t\treturn -EINVAL;\n \tmmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm,\n \t\t\t\trange.start, range.end);\n \n", "prefixes": [ "v1", "01/16" ] }