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baolin.wang@linux.alibaba.com, byungchul@sk.com, david@kernel.org, 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, sashiko-bot , stable@vger.kernel.org Subject: Re: [PATCH v3 1/3] mm/mempolicy: skip non-present PMDs when queueing folios Message-ID: References: <20260710105557.1987433-1-usama.arif@linux.dev> <20260710105557.1987433-2-usama.arif@linux.dev> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260710105557.1987433-2-usama.arif@linux.dev> X-ClientProxiedBy: MEWP282CA0177.AUSP282.PROD.OUTLOOK.COM (2603:10c6:220:1cd::20) To CH2PR12MB5001.namprd12.prod.outlook.com (2603:10b6:610:61::18) MIME-Version: 1.0 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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 > Reviewed-by: Zi Yan > Acked-by: David Hildenbrand (Arm) > Signed-off-by: Usama Arif > --- > mm/mempolicy.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 914f81863db5..69a00a324ef5 100644 > --- a/mm/mempolicy.c > +++ b/mm/mempolicy.c > @@ -654,12 +654,14 @@ static void queue_folios_pmd(pmd_t *pmd, struct mm_walk *walk) > { > struct folio *folio; > struct queue_pages *qp = walk->private; > + pmd_t pmdval = pmdp_get(pmd); > > - if (unlikely(pmd_is_migration_entry(*pmd))) { > - qp->nr_failed++; > + if (unlikely(!pmd_present(pmdval))) { > + if (pmd_is_migration_entry(pmdval)) > + qp->nr_failed++; > return; > } > - folio = pmd_folio(*pmd); > + folio = pmd_folio(pmdval); > if (is_huge_zero_folio(folio)) { > walk->action = ACTION_CONTINUE; > return; > -- Reviewed-by: Balbir Singh