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b=E//5SjL5/R7iYfuBl1SYaWe9kRFOPueCKxq7aSkBh4qUXlA9AMUvX7EIEhxeVDkhl7J6DUbD4qFEH/ehX3wX45SHkrk7xjnegd2IH3QS9KVqZfUC66GUkcQrja+0kkZIaPpK7r1709S0ft0B2GbVmotxgkbNWpIY+xNAlNqRjk0= Received: from 30.74.144.111(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0WziN4bE_1771912193 cluster:ay36) by smtp.aliyun-inc.com; Tue, 24 Feb 2026 13:49:54 +0800 Message-ID: Date: Tue, 24 Feb 2026 13:49:53 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/5] mm: rmap: add a ZONE_DEVICE folio warning in folio_referenced() To: Rik van Riel , akpm@linux-foundation.org, david@kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, lorenzo.stoakes@oracle.com, ryan.roberts@arm.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, harry.yoo@oracle.com, jannh@google.com, willy@infradead.org, baohua@kernel.org, dev.jain@arm.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, hannes@cmpxchg.org, zhengqi.arch@bytedance.com, shakeel.butt@linux.dev, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: From: Baolin Wang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 0387440003 X-Rspamd-Server: rspam02 X-Stat-Signature: fmp1rujgxfapujohs3f611a6us766oxy X-HE-Tag: 1771912200-433806 X-HE-Meta: U2FsdGVkX1/ivA0dSA1Yjx0u/4b5xH+12bhnXlIGn+MolKGYLYy+r/aDGRBevxF70ryZ9j0M8qHPKnT0YfXuYi90GHHge4GYiNywhFza843fxs7YeCv19RM5mfIuiKOn09GPT/RcuXsTojriEndncyLOzKnbXIQ5ikpbcUs4TiwKRwCXs8RKgoe2n29DzFdBQh8LxsuxctfOVGGPucW46kpkUjdKtBYnBaoXV5Zh20QrXI7yUmMqmg81CKjV2Aff3i5/JnJ7QcDecoyNoNhM3FfexE4vE4bQqXQSo3OrRjIxBkgNUEItyznRNhvsS/zAfx1GeyqF0o8pi3BTzdJLXk+3vhPCFTNiJ0xU9PBcvMAsHEArJTDH6LXqZz8HxVjyGfqLvnLtMwaOZm5nMplA9R0P0pXdaVlb1QR9XIoSjxx9iDZnJ5T9WPfoBTEuc9l/bCQxm/lfU6Ju0c4ivcvL06z3o2yBmfUs4Vkl1KVApmUku3vRSTCye6Xn2sL91Q+ITJxEPPVjj5bfzNm4ymqOAP7So9nSEOf/tap7zh1+nOhldMWywaYa3fAbudgXvABbb6rfxJB1lj2VPYkEtLo9ly1tCpZz2qwOJA6UYjn//le9pxAq1Fi8sCX/pCyKrJx04UAW0pRW8nfdoUUKYqOQKjNvzawuJHTCp3JVNWQiFaBwkXbnMQaW+Plt0BSQBMwdbIryuRb4eh46DSuz0Lc9jivoxCqYHUKZBCzBhYoJpFMetQzhoZbPaabs7qHn4bJ6diQkEHp6gn0Bq4NNL4RFAXUtPG6PRmEpZZmH/8pn6H1NEmCOXBxK2tyx3VHoBcAOXV4C0ex8l3r2gQdbxSQ7rK4wv1+zzXiw+IBW5OmjAWyFUoWRIofFCrXbepSw2ORbbSx84Ag50KYpldi3I16+bWDOCsRY0zXc3SOEXvKJojAo2aN+xnDh/xf6YSQQXCu6PrwS3iDjIQ1lPgW+UkP EKUCx7zu I8CsEyqWt6WIvQRcYMY0TR4xszgsF17HyX/+LyVeSsW0wMwS3ShvPJ7Y73sj4rzMmW4N5QRA+iEDDhKyAsFs9/Qq3MTEYtUg9QvR7RJw51weXPnfn08IWHjYUkmTZMt8sIlwq1WIg5kEQi9mO6Je9jvutqCd+yZlKu/0blIAZrA8edopxU4+992gCGYhTpM5pGoajcmNAi3WCoxI3NiutD0r/W8mtmgr2lYleb8ewELeoGlR5O/T+yX2WlTRscGqL+imLvvosoHHKc/c+eZBGzpyXtfyJSyOd4ylgqyE/3GXAiKa7dQykyfbkFwtgc/VtqjGWRZV1CzPuLZZQGAjzzxfItZJ2XCdAvh0rp508uVhQ0Idr95Yh5Dmo08NAvLBK1zyp X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/24/26 10:38 AM, Rik van Riel wrote: > On Tue, 2026-02-24 at 09:56 +0800, Baolin Wang wrote: >> >> diff --git a/mm/rmap.c b/mm/rmap.c >> index bff8f222004e..be785dfc9336 100644 >> --- a/mm/rmap.c >> +++ b/mm/rmap.c >> @@ -1065,6 +1065,7 @@ int folio_referenced(struct folio *folio, int >> is_locked, >>   .invalid_vma = invalid_folio_referenced_vma, >>   }; >> >> + VM_WARN_ON_FOLIO(folio_is_zone_device(folio), folio); >>   *vm_flags = 0; >>   if (!pra.mapcount) >>   return 0; > > Should be a VM_WARN_ON_ONCE_FOLIO so we do not cause > a softlockup if we try to print information about a > million ZONE_DEVICE pages? Yes, sounds reasonable. Will do in next version. Thanks for reviewing.