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t=1783515941; bh=/h79yJy1u8ZSyvoFD94XJpXFnCee2Wtxipv9HGt8DnU=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=jMQd+R06mzZYgsdxXb20iIuLqDkr7+4IpgNO6Fh146lXX6Xz1IyGtst36WPpjefzz upJRA4vZsJ0kyL3yDnb+rCLdJHmQzDZ6L6tUJ5a1/+P9+8JWqFpIYcMxsAdGu9fN1x XPuBpQKzcjzyrK8OdaYQs9SF59D4UbxIFuel+gez5AedS4oMqf4g9QrU5+FR58zxWY /FT4cCmoumhfxYtZXcorJzMtkZ1milvS8M/Mwpb3qUgF8R0hNymKerLoj3vGgj7UCN 5nMyaDc8YqabDbjbMbAI/PGEgq3LNBsIjYoM4SiXS8v2Lu9madudvIZaxxYHLV3BdK og3GvJFDcCbbw== Message-ID: Date: Wed, 8 Jul 2026 15:05:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/3] mm/mempolicy: skip non-present PMDs when queueing folios To: Usama Arif , Andrew Morton , apopple@nvidia.com, balbirs@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, byungchul@sk.com, dev.jain@arm.com, gourry@gourry.net, jannh@google.com, joshua.hahnjy@gmail.com, lance.yang@linux.dev, liam@infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, matthew.brost@intel.com, npache@redhat.com, rakie.kim@sk.com, ryan.roberts@arm.com, vbabka@kernel.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, shakeel.butt@linux.dev, hannes@cmpxchg.org Cc: sashiko-bot , stable@vger.kernel.org References: <20260708122040.861335-1-usama.arif@linux.dev> <20260708122040.861335-2-usama.arif@linux.dev> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: A300514000B X-Stat-Signature: qosi1mitb3pa9f98dq5jzjjb1cpzncaj X-HE-Tag: 1783515942-696721 X-HE-Meta: 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 I6lUXY30 2zneVGa7OfQCCRJ83z6U5qyVZq8oeTo/mDnHDkDsI56qNrWXPuSDdMM/50+aOJrJCS2S+JTbouJdYgQqYrSq8wQXdUfWqD7cylkwG+OhgajJ8PyPcjZCiXhVCgaR9q3ltvY+eDWbX6zE1ltco7HWOwQBhHomxO2ERbxZhQzsdw0d/zOg47BXIx+Oiqx5c7jYe6kyfBzgXs/5ZycEdeZA71t0h8EWIil9KqAr8Q1sR0E5BjEjb6F+w21fzlE6qlf2h+OE6Ro2XMjoL2pbv7IAamYyD8T3RNAqw32GDQ6z7tRFQTl1mhFzNvnP5qbr9RCa/ng7RTlnbysk9wMUwQRIEFcylfjBJHBTrCDgcFua2TY5D2oZREtKOLvLrglU+10ztaaWIGUnc+gUmW/6C3c9NHf2E0kVsPAf0Ma8x1zR+Kue/LKy6aJuvFGl37m2U/vopcBzo Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/8/26 14:20, Usama Arif wrote: > queue_folios_pmd() is called under pmd_trans_huge_lock(), whose > pmd_is_huge() check returns true for any non-present, non-none PMD > softleaf. Passing such a PMD to pmd_folio() treats the softleaf encoding > as a hardware PFN and can return a bogus folio pointer. > > Mirror queue_folios_pte_range(): handle non-present entries before > looking up a folio. Keep migration entries counted as failures, but skip > other non-present PMDs such as device-private entries. > > Potential trigger: an HMM-based GPU driver migrates an anonymous THP > folio to device memory via migrate_vma_pages(), leaving a device-private > PMD. Userspace then calls mbind(), migrate_pages() or > set_mempolicy_home_node() on that range. > > Reported-by: sashiko-bot > Link: https://sashiko.dev/#/patchset/20260703173903.3789516-1-usama.arif%40linux.dev?part=6 > Fixes: 368076f52ebe ("mm/huge_memory: add device-private THP support to PMD operations") > Cc: > Reviewed-by: Joshua Hahn > Signed-off-by: Usama Arif > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David