From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC6F213A86C; Wed, 14 Jan 2026 00:15:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768349714; cv=none; b=FDwrxT1zHMc00lFtJXamD0ab+91A5Oh9S7f4wU1lq5zJBg7O+9vtBWcdFRUqCa+8+gqz/7yA0VPUktu3NQhviW8RUjBlyl+QAP00PzcGx5ME/C4H1cgPvI6FoRu7F0E7GobnWUYkZILCMVfpie8PLYEMawl2JZW4CE6PzK9XYgs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768349714; c=relaxed/simple; bh=3EvefWsLoxPlogKPQ2X10cKF3OlYgoQwf3eHHgy7cF0=; h=Date:To:From:Subject:Message-Id; b=oZI+twu8HkL7hS5DuH09tPj4V58HL+85jGtoOH3j/Mwkia86Asti8mpQXFz8TydpgofvaTtcOtaCk8/3McLaeKsJQRXe8gJlJqj9xJ1sKxtEgtKuPV08MdBFCgeTzryPcIVbIKt1SHXwphyhxjkI5J4Q40k6pejGS2R1J9RWkG8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=h6WIfwr3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="h6WIfwr3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D563C116C6; Wed, 14 Jan 2026 00:15:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1768349713; bh=3EvefWsLoxPlogKPQ2X10cKF3OlYgoQwf3eHHgy7cF0=; h=Date:To:From:Subject:From; b=h6WIfwr3+ShW5Q6YZRn1iPWqhn75TsMD7VxLcN69+WKzdG0emI4TBBCTq7U0A14Iz JOlZV+nL035lLOVYNO1J4VXzWWBInHudeBjMw2No4GSDDWDqN2nWiSS9MmFYosWY+4 pzfWU648kbSs0IU0Ktg553DojZ5e/pPnCMSrDCpQ= Date: Tue, 13 Jan 2026 16:15:12 -0800 To: mm-commits@vger.kernel.org,surenb@google.com,stable@vger.kernel.org,rppt@kernel.org,pratyush@kernel.org,pasha.tatashin@soleen.com,graf@amazon.com,ran.xiaokai@zte.com.cn,akpm@linux-foundation.org From: Andrew Morton Subject: + kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch added to mm-hotfixes-unstable branch Message-Id: <20260114001513.7D563C116C6@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: kho: init alloc tags when restoring pages from reserved memory has been added to the -mm mm-hotfixes-unstable branch. Its filename is kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Ran Xiaokai Subject: kho: init alloc tags when restoring pages from reserved memory Date: Fri, 9 Jan 2026 10:42:51 +0000 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. Link: https://lkml.kernel.org/r/20260113033403.161869-1-ranxiaokai627@163.com Link: https://lkml.kernel.org/r/20260109104251.157767-1-ranxiaokai627@163.com Fixes: fc33e4b44b27 ("kexec: enable KHO support for memory preservation") Signed-off-by: Ran Xiaokai Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Suren Baghdasaryan Reviewed-by: Pasha Tatashin Cc: Alexander Graf Cc: Pratyush Yadav Cc: Signed-off-by: Andrew Morton --- kernel/liveupdate/kexec_handover.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/liveupdate/kexec_handover.c~kho-init-alloc-tags-when-restoring-pages-from-reserved-memory +++ a/kernel/liveupdate/kexec_handover.c @@ -255,6 +255,7 @@ static struct page *kho_restore_page(phy if (is_folio && info.order) prep_compound_page(page, info.order); + clear_page_tag_ref(page); adjust_managed_page_count(page, nr_pages); return page; } _ Patches currently in -mm which might be from ran.xiaokai@zte.com.cn are kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch