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Wed, 30 Sep 2026 08:08:05 -0700 (PDT) Received: from n232-176-004.byted.org ([36.110.163.96]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e2e587f71bsm9426885ad.2.2026.09.30.08.07.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 08:08:03 -0700 (PDT) From: Muchun Song To: Andrew Morton , David Hildenbrand , Oscar Salvador , Madhavan Srinivasan , Michael Ellerman , Jonathan Corbet Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org, Muchun Song , Lorenzo Stoakes , Mike Rapoport , Qi Zheng , Nicholas Piggin , Christophe Leroy , Ritesh Harjani , Shrikanth Hegde , Randy Dunlap , Muchun Song , Lance Yang Subject: [PATCH] fixup! mm/sparse-vmemmap: switch device DAX to shared tail vmemmap pages Date: Wed, 30 Sep 2026 23:07:48 +0800 Message-ID: <20260930150748.1134516-1-songmuchun@bytedance.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260930140627.57431-8-songmuchun@bytedance.com> References: <20260930140627.57431-8-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: m3xbgz3a8px8y5qokgidb1mam6smcwon X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: E719680009 X-HE-Tag: 1790780886-833371 X-HE-Meta: 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 R7D/fOP2 OK311hF73+J3z9fJO2IZ6+wVW8thRy1GCqy9y/89zqrLxg5a2x5fXrPruC+DWq59tCDk8fzV5oy6rS+l1EXA3a88t4oIlQHQ7v7rGjfqkES4h7hYdguvbgKiTeuuthc0/VB08n96L10jJYxS6/X9+Q6VjhKYriWNcZHyoyQj1GCG2HxB2tRL6HiY+/tD8Vfl5vjqic2bHHgbkk8GEVE8aPOzLDu2bEWDMRvsBtKPRADxAOwsNPcY4jZGt2C+0/dfLds0U2VAhdkQfgZcFpbzW+Xzhxhhcw0ObwI7f/IaKLcDUih+PtbIg+zxQ1i5dY5kahDpLz9M1gH8BoVwPFgkn4tTGwz9xy1FOZAWVwHuW6a/fGoa8yHeF3suyxGs2Lq+dtJKYgVRzMH4RNIue1Ck8Cv69Se+w5n7mKg+dsgVpOPDYjUE= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: prep_compound_tail() makes PageCompound() true. Calling __SetPageReserved() afterwards violates the PF_NO_COMPOUND policy and triggers VM_BUG_ON_PGFLAGS() when CONFIG_DEBUG_VM_PGFLAGS is enabled. Set PG_reserved before preparing the compound tail. Signed-off-by: Muchun Song --- mm/sparse-vmemmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 4be85e194c78..23b31bc4bf94 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -222,9 +222,9 @@ struct page __ref *vmemmap_shared_tail_page(unsigned int order, struct zone *zon atomic_set(&page->_mapcount, -1); set_page_node(page, zone_to_nid(zone)); set_page_zone(page, zone_idx(zone)); - prep_compound_tail(page, NULL, order); if (zone_is_zone_device(zone)) __SetPageReserved(page); + prep_compound_tail(page, NULL, order); } page = virt_to_page(addr); -- 2.54.0