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Received: from 30.74.144.119(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0XAePNMm_1788945380 cluster:ay36) by smtp.aliyun-inc.com; Wed, 09 Sep 2026 17:16:22 +0800 Message-ID: <9fd65a16-51d6-4c21-91f0-f278479316c5@linux.alibaba.com> Date: Wed, 9 Sep 2026 17:16:20 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 07/19] selftests/mm: move is_backed_by_folio() into vm_util To: Kiryl Shutsemau , akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, rppt@kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, usama.anjum@arm.com, usama.arif@linux.dev, nico.pache@linux.dev, ziy@nvidia.com, baohua@kernel.org, dev.jain@arm.com, hughd@google.com, lance.yang@linux.dev, liam@infradead.org, mhocko@suse.com, ryan.roberts@arm.com, shuah@kernel.org, surenb@google.com, vbabka@kernel.org, agordeev@linux.ibm.com, jgg@ziepe.ca, leon@kernel.org, kernel-team@meta.com, "Kiryl Shutsemau (Meta)" References: <20260908125105.1510704-1-kirill@shutemov.name> <20260908125105.1510704-8-kirill@shutemov.name> From: Baolin Wang In-Reply-To: <20260908125105.1510704-8-kirill@shutemov.name> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 53F0940003 X-Stat-Signature: 95f6ik145scdr15y48ikx1h1zrksrbsr X-HE-Tag: 1788945386-49070 X-HE-Meta: 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 aiaPQDXs ST3BGdQcaJ0uFzAJ66JqT9Yz5QHhWeLZUCerXTVvY9Td5xaatz7cqAh7CMFe/ZGKIpsiKvE+DgFg+FbNOUTiJUlgBmAFOvjGkqpEiq8hmfw9ja9M/uGFdS1hpYvVuMDSZ+wry+nglULYZmXUlMUQo8S2bzZEwX+5yEPASxP9iTeQqp0D6UDm10QBeRlo7ltg2O52tSNkF5hiX4tYs1jFoxWhYS0FVjPQLEAWu1hLIMVoo6y0Dnww52CFsTDxJUzZ8p+7Ni0lQml23qOazbxcg0F3hmkN3RqeCnOkgBOFJpY4r55sSZXy/1nK/a+u05Zt4wizS+Y+RhdmPDjrvoVWAwsaiqbvWNIJZWvs68ntCGcWvDLdG0m+2SJUUL+4WyhPD6TgY5iwaHiAO3Qr5GtKi6QEDhNnynxHk0DqzfJhPOEXJUBma8e+0yHji95DXO5AQ6HDJlvjUvMQb37I= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/8/26 8:50 PM, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > Checking that an address range is backed by a folio of a given order is > useful to any test that builds or collapses large folios. mTHP collapse > coverage in the khugepaged selftest needs exactly that. > > split_huge_page_test.c already has the building block: > is_backed_by_folio() reads the compound head and tail flags from > /proc/kpageflags to classify the folio behind a page. > > Move it into vm_util so other tests can use it. No functional change. > > Assisted-by: LLM > Acked-by: Mike Rapoport (Microsoft) > Acked-by: Lorenzo Stoakes (ARM) > Tested-by: Muhammad Usama Anjum > Signed-off-by: Kiryl Shutsemau (Meta) > --- LGTM. Reviewed-by: Baolin Wang