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[2003:cb:c734:b800:12c4:65cd:348a:aee6]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-4390d933523sm192523445e9.1.2025.02.10.11.38.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Feb 2025 11:38:29 -0800 (PST) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, nouveau@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, damon@lists.linux.dev, David Hildenbrand , Andrew Morton , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Jonathan Corbet , Alex Shi , Yanteng Si , Karol Herbst , Lyude Paul , Danilo Krummrich , David Airlie , Simona Vetter , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , SeongJae Park , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , Pasha Tatashin , Peter Xu , Alistair Popple , Jason Gunthorpe Subject: [PATCH v2 07/17] mm/page_vma_mapped: device-exclusive entries are not migration entries Date: Mon, 10 Feb 2025 20:37:49 +0100 Message-ID: <20250210193801.781278-8-david@redhat.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250210193801.781278-1-david@redhat.com> References: <20250210193801.781278-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" It's unclear why they would be considered migration entries; they are not. Likely we'll never really trigger that case in practice, because migration (including folio split) of a folio that has device-exclusive entries is never started, as we would detect "additional references": device-exclusive entries adjust the mapcount, but not the refcount. Fixes: b756a3b5e7ea ("mm: device exclusive memory access") Reviewed-by: Alistair Popple Signed-off-by: David Hildenbrand --- mm/page_vma_mapped.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index 81839a9e74f16..32679be22d30c 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -111,8 +111,7 @@ static bool check_pte(struct page_vma_mapped_walk *pvmw) return false; entry =3D pte_to_swp_entry(ptent); =20 - if (!is_migration_entry(entry) && - !is_device_exclusive_entry(entry)) + if (!is_migration_entry(entry)) return false; =20 pfn =3D swp_offset_pfn(entry); --=20 2.48.1