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t=1772027844; bh=OUurYv35bNhXesuuVWjFpAi6I65QdGPN0j4kp3KPEIs=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=I92pcnP/2w/38kBmgcDkuu+UDMvqA+rUZOm3NlbmqSs/M2THpW0kgPllrMeteQshm vOfYwOs6vei328598cOpaenhGoAYoIXD8nqV3ivJKUH8XAGotGZwQ7E8Z0JAMtXwgK D4xDk1e+5hc9dMVj+LDpW/dmGs9gFZYy5974BopbOmYeeSGU2+JN7Sw45oAvy3uVKa JPaQR+IhNJIM34CCmd1FDef2ElMhcfCqoXmwPSLgxT2yWhQK9+phbCg0ro0Wucn9HE pBg9j6ZoA5ndt9PZGt40XNny4FR0erxKyQ9Zb5gdcR8sE2EAbZB5tjLfsw+1I1avWS sXSvM8ohkeL9A== Message-ID: <258cad5e-9ad2-4dfa-a090-c65bbe3fc7ff@kernel.org> Date: Wed, 25 Feb 2026 14:57:16 +0100 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: Baolin Wang , Rik van Riel , akpm@linux-foundation.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: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 6573E120008 X-Stat-Signature: d9rykud83umhfucdrt1gdnonhi5b9ddx X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1772027845-358035 X-HE-Meta: U2FsdGVkX18bcA4DVcwZSC+fqAoBLvqASH0+rv54Sb8mprRzqOOrnSjw0JjQbB+9lUR3iKP/IOsNa2Sg2WmBLbsrnxvHeHCUeFw/K6GurAq23HLh6rH/sJlX5Oiqhhnhrtd2oLi9d0jzPeKPpMk+/phoz6omAEn9gmT8BRxBYU+rfpDWGY+8EvEqx/wm2lUqM0u9j0QmocUBH2hJltR4uz+BwMuWJY7O6PjFMhT4KjKtTJvOBj0ibT+CyB0L/1p2CvHYiv2ji5a3QSxAgp63kCx48uOqGVesyYnqihrApx06LkAYWJusrgRIV8f8IflfUAGUZV9Pf/9ervEARZDltMQ25bqAmfnJMYx9wg5GixOC1lI6RskYTyryppcorm7Z/4s3iboBgeG3uXR9joSv2clVQOILer8h1cAlsmJrFccDX8Gzx/UsbWzPYf7xbk73nNEe9qUDYoImg3iM1a6kQTpr6bH1uOPbN+Xwv4OAZTSlRTlDI6Mnzf2tK9aCR+x5aQ6pA0tHoaw4LzzMjYqBZI+YRk+lhln+3VO4oVgsBW+B20LbM6mCgUzJHImygKaOsHXmmD9tR30Ahu8ZiOfKebIjc78H3NZQHSsovR35Q6nfCyNB+secxcr1S9JPMu1nyy1Wy2ucQCKEwdLEHhm+hKaS4Xn75wYXQwUr+Xb6iElB0mpt1ktE4aiJofhF4wqBJPw7YUzLzKWDgvo2clTAJTGikf5Us822XlOEiW9mWlO9n12HmWeHxXydI+SJ+GR4gJASZflH5VxdexfgqIRwoon6JcvFx9G+qsX46dWBMgeR6SCN3dfwmczLpUCcllIFdDnB2m0/ElOHXv0PmNiudHhy40aoJ9NFrQUI8n7TIU3AIWxa7rYQ3h2d6zJV3V3/czw7ySkM7fIIWh3YCTTUhHNCmNUUV0TxxC7WBoHNfxbhnpuN9MHfLOhqBs69QxS1A3pcljMX5WRXxZHcLhb /jGTiap7 cP+y9Ci2lSMGdeOUnqglnc/Yo6o1bSFpQE7ESSxqSA4is+v2nj5C7mHEbWPZJ1c8Sg7gx5EChDtt5YBBRBHi4ISPi3eNQXYMikg8KwQZ9/nv4k67q0cCEqU4/J7I+aTdq+sGZ0OMGh5C7gIgTXLlHE8QeE5qLTvu3nQZ6Wj8CzmTTaa6b5CTEUOK4dSN4QERvEnhfRGwz5YOoAYTkDkNdxsOMyhxoeqwDsb42Fjr6AZSRidWxXjV8vgE7T9eKLzJjuDr6hG4/k7+W2alZHM11QWeLtiU/ouaIS4OIuf9NvptCcduJwQjXVnNjoceQ1332Hm2EC1gbl7/0Dw8xEk7xYxp6ZVFIXRP0kfi5 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/24/26 06:49, Baolin Wang wrote: > > > 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. Feel free to add my Acked-by: David Hildenbrand (Arm) to that. -- Cheers, David