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[PATCH] mm/page_vma_mapped: guard check_pmd() with CONFIG_TRANSPARENT_HUGEPAGE To: Wei Yang , Andrew Morton Cc: david@kernel.org, ljs@kernel.org, riel@surriel.com, liam@infradead.org, vbabka@kernel.org, harry@kernel.org, jannh@google.com, willy@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, lance.yang@linux.dev References: <20260624082359.2869-1-richard.weiyang@gmail.com> <20260624131457.ac81fbac373f78aa80a516e3@linux-foundation.org> <20260625034629.nmgdwl2c4luwod77@master> <20260624215943.332f1bdcc99a3b85b7df0822@linux-foundation.org> <20260625064102.tcmvrctcqibl54yr@master> Content-Language: en-US From: Balbir Singh In-Reply-To: <20260625064102.tcmvrctcqibl54yr@master> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BY1P220CA0045.NAMP220.PROD.OUTLOOK.COM (2603:10b6:a03:59e::14) To CH2PR12MB5001.namprd12.prod.outlook.com (2603:10b6:610:61::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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 JrOdhUmh vbJYZh2fnjc5vYCRhVGlEk0CCoazQXozuodyjRJpwLR9LdfJFfAbKDUXVJPOqFBeFDV80F3qg9OjUjXaJ8L+xECDIHzthnxuC3k2Myk2SKAfbkOn0nsyZzLnuNkW5M6XoQL5zU5h28bqtwlSkvcU70NrVkd1qUb4ICdFUHsDRnnu75rOFvp209rjzkzc6LCypTMv/BIm+hgA+nb+qL8frt1/Tcn9P4P0WtbcmYHBmz4joFmcsP1aBhBx2+Tq5SJloDIqJmvR8u16ghRpSXjNMaqwsQb9wwggEHLGyUDkLDMQMxZ3AdpttHUYHgaEQQghmI086T2KXoQLKi+J+cV9uH7vSSRVGqzJ6oa9Qcua9vdynabwLM/PR1RA4TKo15WXg3o4FqUp/VuZyOs8lAawk6L3WETViWq6bwLxjCGveGxWflaBxHpVSFu9E01tPorFw/kelZNNSrioWe+WiaudyRXIqad7OHZu2PyIK6ycQyiCxltjGEWLhqoVVdSL4WcY7RmWNC7HrTyRIKTWTYR49AoyDaWF29xMb9rt73eGF3BZ0yugN2iywJ0IaiEzUSErvnd8nNRD0ksIMK4w3qiWuaS0oulEheumsHD+ZAsqW5u6Ks4Wb0Ig9FvlwS3kc/JM4nWA56U8ZjkaoCng0v+keb8kSUNZI1e2vgD0d Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/25/26 16:41, Wei Yang wrote: > +cc Balbir > > On Wed, Jun 24, 2026 at 09:59:43PM -0700, Andrew Morton wrote: >> On Thu, 25 Jun 2026 03:46:29 +0000 Wei Yang wrote: >> >>>> Sashiko had an off-topic complaint about the surrounding code: >>>> https://lore.kernel.org/oe-kbuild-all/202606240042.ffPsEXVc-lkp@intel.com/ >>> >>> I see this robot reply, but not see the Sashiko comment. >>> >>> How can I view Sashiko's commnet? >> >> oop sorry. >> >> You can go to https://sashiko.dev/ and search for the email subject. >> >> Or append your Message-ID to "https://sashiko.dev/#/patchset": >> >> https://sashiko.dev/#/patchset/20260624082359.2869-1-richard.weiyang@gmail.com >> > > Got it, thansk > > This one mentioned two things: > > a. page_vma_mapped_walk() return without check > b. whether __split_huge_pmd_locked() would split device-private pmd > > For a., it is being fixing at [1]. > > For b., to be honest I am not 100% for sure. If a device-private pmd could be > file backed, then this looks like a bug. > > Balbir, > > Would you mind taking a look at the second comment raised by Sashiko? > > [1]: https://lore.kernel.org/linux-mm/20260624065353.1622-1-richard.weiyang@gmail.com/ > device-private pmd's are not file backed Balbir