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Tue, 12 May 2026 08:58:20 +0800 (CST) Received: from kwepemk200017.china.huawei.com (unknown [7.202.194.83]) by mail.maildlp.com (Postfix) with ESMTPS id E1FFD201E9; Tue, 12 May 2026 09:05:56 +0800 (CST) Received: from [10.174.178.219] (10.174.178.219) by kwepemk200017.china.huawei.com (7.202.194.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 12 May 2026 09:05:55 +0800 Subject: Re: "alloc_tag was not set" when running mm/ksft_hmm.sh To: "David Hildenbrand (Arm)" CC: Zenghui Yu , , , , , Andrew Morton , , , , , , , Alistair Popple References: <10e4565a-b416-45d9-a8b0-cd32532b2630@kernel.org> <2b46241c-158b-c9dd-9b81-a98366b2c9fb@huawei.com> From: Zenghui Yu Message-ID: <1986f468-f8f4-c33a-9e02-4d5f833e3560@huawei.com> Date: Tue, 12 May 2026 09:05:55 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.178.219] X-ClientProxiedBy: kwepems200002.china.huawei.com (7.221.188.68) To kwepemk200017.china.huawei.com (7.202.194.83) X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 866C9140007 X-Rspam-User: X-Stat-Signature: t8q1y5j87q6jjib495g68ijj88ot9ibu X-HE-Tag: 1778547961-636253 X-HE-Meta: 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 ySHw4Cgx 9XsUQnK0zu0M4ZvX8Ce+nrQyNaplQIXtywOpk+Z/g+gchrbN7NJkiZp15z/oyJNKHAEdq9XUJhT6jpOogiO3h6VtfZipZ12CWWQu33oXFV0A9wUY6jNJOvzNZ78PxWB0jRcXWrA0UAjpBV6O5BZufrz259XET4XmLTB4hYJdNNgICCstNZcMJ2wIv02YR+E4zJxxFnINQvTVvwl1hChRUGax0sTke+JlSB4BqcsOKEtQQAxU5uzA0o7tLriKJk5nMmcaXG5NeZje9Y5DzfmTdk3HRLqvAMo83ou07 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026/5/12 0:38, Zenghui Yu wrote: > Hi David, > > On 5/11/26 8:47 PM, David Hildenbrand (Arm) wrote: > > > > We do have a call to pgalloc_tag_split() in __split_unmapped_folio(), invoked in > > __folio_freeze_and_split_unmapped() before calling > > zone_device_private_split_cb() when iterating the folios. > > If I read the code correctly, pgalloc_tag_split() in > __split_unmapped_folio() deals with device private pages' alloc tag. But > what alloc_tag_sub_check() warns on are real system memory pages (device > page's backing page), which are allocated by > dmirror_devmem_alloc_page()/folio_page(). Sorry, I meant dmirror_devmem_alloc_page()/folio_alloc(). Thanks, Zenghui