From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (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 64E9627465C; Fri, 9 Jan 2026 02:24:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767925481; cv=none; b=pVqAGwQAO6qRaMQtsZWR1R4o7qtwGyynXNDZdQSrcVWlBBiWF8e95goGT9j4U/UOWu3YbXfPYzdK9yMaEdqmzvUA/kSoQviGF9H3xTpRYP9QWGdn/SUmE+fkxT8Me7fkUY5VonYA1Yn6mrAHKBHAc2fRrptQfI7+DWnFWhe7wfk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767925481; c=relaxed/simple; bh=lQ4GGjt0Rj3i0mrurqMR6fqMwzGvomMJPo78swHAmzc=; h=Date:From:To:Cc:Subject:Message-ID; b=BjPhzsOV5ZMoALVChtPLPS8AnlOK6fO4anrX3FNf6R252WmUwND0o++QorfQS6nH5rOcu3WaXecIolbF8nE0CU6yaAkDrBNqdBATxKvXAPUCgszbk1PSMJ5+b43+62XQ3vTFBVAeg9Z43R9jFfsrnWeG5/Z8sSOe1QLQSmOGwf0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=eZIFAMX6; arc=none smtp.client-ip=192.198.163.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="eZIFAMX6" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1767925479; x=1799461479; h=date:from:to:cc:subject:message-id; bh=lQ4GGjt0Rj3i0mrurqMR6fqMwzGvomMJPo78swHAmzc=; b=eZIFAMX6Bm6NArgPtdH39nWOvWlqxCPEejccOKtq+yGWfieP8wJ26CfT AbphlhYgc76YCO/J0dswATlICbuzkwwfAZ22m3rbmSTdsSgT1SXETb1/P DM0COgAF+MwfDgtmgiB552Nqxcqlmgroat2raklARQy8D1L7foaGrLTxF eh6bZ1NCAOrYELStfbt45/NxOFRGthnZ3CG/7MybY4HgBs3orn2vpONcY WDQLNd2z9foRICfPasa3bD9PlmG1pGfKBP68TKIornc5wrXif/XFpKrqh BGI8aoxSPPrpPfqhoaI9uEUOLMBKi+fyBCkwdUIMVpK5LSK4ne6pP5WWG g==; X-CSE-ConnectionGUID: /AclPfunS8GtqdC4Mwiddg== X-CSE-MsgGUID: +nhTHzVfRa+BQKa1DUL1lw== X-IronPort-AV: E=McAfee;i="6800,10657,11665"; a="69384683" X-IronPort-AV: E=Sophos;i="6.21,211,1763452800"; d="scan'208";a="69384683" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jan 2026 18:24:39 -0800 X-CSE-ConnectionGUID: aaUwJGcGQkeQo8yW3hsZsA== X-CSE-MsgGUID: jdjLckdMTwuSmtf3ZCoP2Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,211,1763452800"; d="scan'208";a="203387294" Received: from lkp-server01.sh.intel.com (HELO 765f4a05e27f) ([10.239.97.150]) by orviesa007.jf.intel.com with ESMTP; 08 Jan 2026 18:24:37 -0800 Received: from kbuild by 765f4a05e27f with local (Exim 4.98.2) (envelope-from ) id 1ve2Az-000000005Ka-3wjx; Fri, 09 Jan 2026 02:24:33 +0000 Date: Fri, 09 Jan 2026 10:24:28 +0800 From: kernel test robot To: Bing Jiao Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, David Hildenbrand , Andrew Morton , Linux Memory Management List Subject: [akpm-mm:mm-new 259/263] mm/vmscan.c:1046:6: warning: variable 'target_nid' is uninitialized when used here Message-ID: <202601091037.vUSHeJCH-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new head: ba756a5e4580859e0b26f6679d882f81935a7b14 commit: d92027a5f30a6c5c582169114b1e56d6536ca8f8 [259/263] mm/vmscan: select the closest preferred node in demote_folio_list() config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20260109/202601091037.vUSHeJCH-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260109/202601091037.vUSHeJCH-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202601091037.vUSHeJCH-lkp@intel.com/ All warnings (new ones prefixed by >>): >> mm/vmscan.c:1046:6: warning: variable 'target_nid' is uninitialized when used here [-Wuninitialized] 1046 | if (target_nid == NUMA_NO_NODE) | ^~~~~~~~~~ mm/vmscan.c:1026:16: note: initialize the variable 'target_nid' to silence this warning 1026 | int target_nid; | ^ | = 0 1 warning generated. vim +/target_nid +1046 mm/vmscan.c 26aa2d199d6f2c Dave Hansen 2021-09-02 1017 26aa2d199d6f2c Dave Hansen 2021-09-02 1018 /* 49fd9b6df54e61 Matthew Wilcox (Oracle 2022-09-02 1019) * Take folios on @demote_folios and attempt to demote them to another node. 49fd9b6df54e61 Matthew Wilcox (Oracle 2022-09-02 1020) * Folios which are not demoted are left on @demote_folios. 26aa2d199d6f2c Dave Hansen 2021-09-02 1021 */ 49fd9b6df54e61 Matthew Wilcox (Oracle 2022-09-02 1022) static unsigned int demote_folio_list(struct list_head *demote_folios, 059c4bb2dc3b93 Bing Jiao 2026-01-08 1023 struct pglist_data *pgdat, 059c4bb2dc3b93 Bing Jiao 2026-01-08 1024 struct mem_cgroup *memcg) 26aa2d199d6f2c Dave Hansen 2021-09-02 1025 { d92027a5f30a6c Bing Jiao 2026-01-08 1026 int target_nid; 26aa2d199d6f2c Dave Hansen 2021-09-02 1027 unsigned int nr_succeeded; 32008027289239 Jagdish Gediya 2022-08-18 1028 nodemask_t allowed_mask; d92027a5f30a6c Bing Jiao 2026-01-08 1029 nodemask_t preferred; 32008027289239 Jagdish Gediya 2022-08-18 1030 32008027289239 Jagdish Gediya 2022-08-18 1031 struct migration_target_control mtc = { 32008027289239 Jagdish Gediya 2022-08-18 1032 /* 32008027289239 Jagdish Gediya 2022-08-18 1033 * Allocate from 'node', or fail quickly and quietly. 32008027289239 Jagdish Gediya 2022-08-18 1034 * When this happens, 'page' will likely just be discarded 32008027289239 Jagdish Gediya 2022-08-18 1035 * instead of migrated. 32008027289239 Jagdish Gediya 2022-08-18 1036 */ bd63d0fde2a2c3 Fushuai Wang 2025-10-06 1037 .gfp_mask = (GFP_HIGHUSER_MOVABLE & ~__GFP_RECLAIM) | 32008027289239 Jagdish Gediya 2022-08-18 1038 __GFP_NOMEMALLOC | GFP_NOWAIT, e42dfe4e0a51b4 Baolin Wang 2024-03-06 1039 .nmask = &allowed_mask, e42dfe4e0a51b4 Baolin Wang 2024-03-06 1040 .reason = MR_DEMOTION, 32008027289239 Jagdish Gediya 2022-08-18 1041 }; 26aa2d199d6f2c Dave Hansen 2021-09-02 1042 49fd9b6df54e61 Matthew Wilcox (Oracle 2022-09-02 1043) if (list_empty(demote_folios)) 26aa2d199d6f2c Dave Hansen 2021-09-02 1044 return 0; 26aa2d199d6f2c Dave Hansen 2021-09-02 1045 26aa2d199d6f2c Dave Hansen 2021-09-02 @1046 if (target_nid == NUMA_NO_NODE) 059c4bb2dc3b93 Bing Jiao 2026-01-08 1047 /* No lower-tier nodes or nodes were hot-unplugged. */ 26aa2d199d6f2c Dave Hansen 2021-09-02 1048 return 0; 26aa2d199d6f2c Dave Hansen 2021-09-02 1049 32008027289239 Jagdish Gediya 2022-08-18 1050 node_get_allowed_targets(pgdat, &allowed_mask); 059c4bb2dc3b93 Bing Jiao 2026-01-08 1051 mem_cgroup_node_filter_allowed(memcg, &allowed_mask); 059c4bb2dc3b93 Bing Jiao 2026-01-08 1052 if (nodes_empty(allowed_mask)) 059c4bb2dc3b93 Bing Jiao 2026-01-08 1053 return 0; 059c4bb2dc3b93 Bing Jiao 2026-01-08 1054 d92027a5f30a6c Bing Jiao 2026-01-08 1055 target_nid = next_demotion_node(pgdat->node_id, &preferred); d92027a5f30a6c Bing Jiao 2026-01-08 1056 while (target_nid != NUMA_NO_NODE && d92027a5f30a6c Bing Jiao 2026-01-08 1057 !node_isset(target_nid, allowed_mask)) { d92027a5f30a6c Bing Jiao 2026-01-08 1058 /* Filter out preferred nodes that are not in allowed. */ d92027a5f30a6c Bing Jiao 2026-01-08 1059 nodes_and(preferred, preferred, allowed_mask); d92027a5f30a6c Bing Jiao 2026-01-08 1060 if (!nodes_empty(preferred)) { d92027a5f30a6c Bing Jiao 2026-01-08 1061 /* Randomly select one node from preferred. */ d92027a5f30a6c Bing Jiao 2026-01-08 1062 target_nid = node_random(&preferred); d92027a5f30a6c Bing Jiao 2026-01-08 1063 break; d92027a5f30a6c Bing Jiao 2026-01-08 1064 } d92027a5f30a6c Bing Jiao 2026-01-08 1065 /* d92027a5f30a6c Bing Jiao 2026-01-08 1066 * Preferred nodes in the lower tier are not set in allowed. d92027a5f30a6c Bing Jiao 2026-01-08 1067 * Recursively get preferred from the next lower tier. d92027a5f30a6c Bing Jiao 2026-01-08 1068 */ d92027a5f30a6c Bing Jiao 2026-01-08 1069 target_nid = next_demotion_node(target_nid, &preferred); d92027a5f30a6c Bing Jiao 2026-01-08 1070 } d92027a5f30a6c Bing Jiao 2026-01-08 1071 d92027a5f30a6c Bing Jiao 2026-01-08 1072 if (target_nid == NUMA_NO_NODE) d92027a5f30a6c Bing Jiao 2026-01-08 1073 /* Nodes are gone (e.g., hot-unplugged). */ d92027a5f30a6c Bing Jiao 2026-01-08 1074 return 0; 059c4bb2dc3b93 Bing Jiao 2026-01-08 1075 mtc.nid = target_nid; 32008027289239 Jagdish Gediya 2022-08-18 1076 26aa2d199d6f2c Dave Hansen 2021-09-02 1077 /* Demotion ignores all cpuset and mempolicy settings */ 29ea04095b9697 SeongJae Park 2025-06-16 1078 migrate_pages(demote_folios, alloc_demote_folio, NULL, 32008027289239 Jagdish Gediya 2022-08-18 1079 (unsigned long)&mtc, MIGRATE_ASYNC, MR_DEMOTION, 26aa2d199d6f2c Dave Hansen 2021-09-02 1080 &nr_succeeded); 26aa2d199d6f2c Dave Hansen 2021-09-02 1081 26aa2d199d6f2c Dave Hansen 2021-09-02 1082 return nr_succeeded; 26aa2d199d6f2c Dave Hansen 2021-09-02 1083 } 26aa2d199d6f2c Dave Hansen 2021-09-02 1084 :::::: The code at line 1046 was first introduced by commit :::::: 26aa2d199d6f2cfa6f2ef2a5dfe891f2250e71a0 mm/migrate: demote pages during reclaim :::::: TO: Dave Hansen :::::: CC: Linus Torvalds -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki