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(unknown []) by gzga-smtp-mtada-g1-2 (Coremail) with SMTP id _____wDXrf0wvWVpTNjGFQ--.289S2; Tue, 13 Jan 2026 11:34:10 +0800 (CST) From: ranxiaokai627@163.com To: graf@amazon.com, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, akpm@linux-foundation.org, surenb@google.com Cc: kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, ran.xiaokai@zte.com.cn, ranxiaokai627@163.com Subject: [PATCH v2] kho: init alloc tags when restoring pages from reserved memory Date: Tue, 13 Jan 2026 03:34:03 +0000 Message-ID: <20260113033403.161869-1-ranxiaokai627@163.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wDXrf0wvWVpTNjGFQ--.289S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7ArWkWr1xuFWrXFyruw4xXrb_yoW8WFy5pr y8Xr18J3y8J3ZrZayvq3Wq934fXan5W3y3Ja4Du34fZrnxCwn7ta97Za40qFy5Zr4vvF43 KF4UXrWYq3WY9w7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0piOtx3UUUUU= X-Originating-IP: [117.176.243.29] X-CM-SenderInfo: xudq5x5drntxqwsxqiywtou0bp/xtbCxhIve2llvTIqUAAA35 X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 62CE6A0019 X-Stat-Signature: iyxwinidtdkwkc1ouubkmnaazn8bi3dk X-HE-Tag: 1768275294-547515 X-HE-Meta: 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 LpOAeJ9z k46L4bRMEezaibzlfSICC55FVAEHD7vag3K4EmCFqvksPQUSuMx8IMDUVUWbK7k9tTEPlJ3/91/hHAvmhv1V8wpOFmjktGof7azaRzHiyS53M7zOfgmsmYoOmzhbjjbT1dqfkl9l9s1oj5fpqLEPRlWIkhneaSONlPExGoGTDRuGOyrJdKfBs7ZOqGLIwPtpdKaVKsZSJOMvd7xEyHl00H+GTJrcj9DMc89xbnzhtqlvJtGtv0rZ3gUCKcGP209dIu04VaJ4CWCX0jh0Z1ovGV+m2Qv/9nS39jNmrlBDQX5/iUJJi56JEuHT2DCsO19Np4uvSNtnU5uuLXX2kibprqpWIKD8LW4N4S+IfDINvt7TsD/Ydu4LFR+pzffJa3VsafTjoonItqsb2MRTA+CZoVvbMBnzvyzCeIpNb4duO/WqijfFT7rAlbqIe4WeXgufiTTT5 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ran Xiaokai Memblock pages (including reserved memory) should have their allocation tags initialized to CODETAG_EMPTY via clear_page_tag_ref() before being released to the page allocator. When kho restores pages through kho_restore_page(), missing this call causes mismatched allocation/deallocation tracking and below warning message: alloc_tag was not set WARNING: include/linux/alloc_tag.h:164 at ___free_pages+0xb8/0x260, CPU#1: swapper/0/1 RIP: 0010:___free_pages+0xb8/0x260 kho_restore_vmalloc+0x187/0x2e0 kho_test_init+0x3c4/0xa30 do_one_initcall+0x62/0x2b0 kernel_init_freeable+0x25b/0x480 kernel_init+0x1a/0x1c0 ret_from_fork+0x2d1/0x360 Add missing clear_page_tag_ref() annotation in kho_restore_page() to fix this. Fixes: fc33e4b44b27 ("kexec: enable KHO support for memory preservation") Signed-off-by: Ran Xiaokai Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Suren Baghdasaryan --- kernel/liveupdate/kexec_handover.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c index cd6b3fb9dcae..2d47f2c50bd8 100644 --- a/kernel/liveupdate/kexec_handover.c +++ b/kernel/liveupdate/kexec_handover.c @@ -268,6 +268,7 @@ static struct page *kho_restore_page(phys_addr_t phys, bool is_folio) else kho_init_pages(page, nr_pages); + clear_page_tag_ref(page); adjust_managed_page_count(page, nr_pages); return page; } -- 2.25.1