From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 0483938BF9A for ; Mon, 19 Jan 2026 18:52:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768848728; cv=none; b=Ij8PL0aM6lB84YAtWnLcvWYqCxkYbCdGe07upuTKpTAgBYZoFXXD4YHjr+Xm1YDbnDmdx5GPfWsj7pFGeSB2Ii7DE9iZ3PU9xco7qh0w+a81lL/usJPRTQ3epvn9zyaqDpqi1iBdLcYeypkuZMoUXgype2+fAiJwl6PTJr0VIPQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768848728; c=relaxed/simple; bh=VtlK8z2dgWXPOzjnUa0xK9s3WHtsZoKmtbhZZ0KCnHg=; h=Date:From:To:Cc:Subject:Message-ID; b=AuO+lOl+46bBlII9J+VFjR9Il5xjdn3ngN0OKKr9UtM2Kgk9qmfuhBEStNfMlKJD74ezY6rnsnCOR5SAMTpPAQJTVaWi8ZxWgG1woOeZ6qIbwlGS4SfS+LapxSH5Ini5/feJ+/0eHLQbhnSMvOqZFDZ4GV/BUQGZyx37h7V7KOw= 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=DIDfWY/o; arc=none smtp.client-ip=198.175.65.17 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="DIDfWY/o" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1768848727; x=1800384727; h=date:from:to:cc:subject:message-id; bh=VtlK8z2dgWXPOzjnUa0xK9s3WHtsZoKmtbhZZ0KCnHg=; b=DIDfWY/ozJ4VwaJimWVnvoWV+QapDBmHqYpuyYTWnunAIar2Q1SHpvbg bKKZ8WYJxXT24bgYX/ovtCNfPAelP5DzW+aiGzdLBe42vHtqXq6tikNGL 9m6AO9cygo5TcI7dAiQODOE3XsAtsrQ/XoW17bHD5nqm91haQ4hZTqgOO wN8tXNJbbE4uWh2Dt4uVHaeZWfbihZGFt1NTvj5f7oArRDAaUOC99oPd4 gu07uJW/GkvTthluT6BF3UBS3x+++UYIbxpQtrJetxEnYxCvVKsWlD0Ve wtlMUO23sSn4CtGb74MVNbwVNWIO40bIcFo4omn85MMqA/d9+KM8OAw3t g==; X-CSE-ConnectionGUID: 21LtSlTZSY20LfiKRGoLcA== X-CSE-MsgGUID: URxRgtrOSoiSbBHvVYvrqg== X-IronPort-AV: E=McAfee;i="6800,10657,11676"; a="70035924" X-IronPort-AV: E=Sophos;i="6.21,238,1763452800"; d="scan'208";a="70035924" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jan 2026 10:52:06 -0800 X-CSE-ConnectionGUID: WPwseNlSRKyf4wDDoCj48Q== X-CSE-MsgGUID: qxAWUGpeSk2cW5mFcCVEZg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,238,1763452800"; d="scan'208";a="237197460" Received: from lkp-server01.sh.intel.com (HELO 765f4a05e27f) ([10.239.97.150]) by fmviesa001.fm.intel.com with ESMTP; 19 Jan 2026 10:52:05 -0800 Received: from kbuild by 765f4a05e27f with local (Exim 4.98.2) (envelope-from ) id 1vhuM7-00000000OBr-1QrE; Mon, 19 Jan 2026 18:52:03 +0000 Date: Tue, 20 Jan 2026 02:51:36 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: [vbabka-slab:slab/for-7.0/obj_metadata 8/10] mm/slub.c:904 need_slab_obj_exts() warn: bitwise AND condition is false here Message-ID: <202601200218.2dRYmU4Q-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-mm@kvack.org TO: Harry Yoo CC: Vlastimil Babka tree: https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git slab/for-7.0/obj_metadata head: 6edcc2867ee1ba95ae6c7695d66124bfdf0771a1 commit: 4fad56bdb6b4c4bc0ea2d919df1ae4eef7b69919 [8/10] mm/slab: save memory by allocating slabobj_ext array from leftover :::::: branch date: 11 hours ago :::::: commit date: 11 hours ago config: nios2-randconfig-r072-20260119 (https://download.01.org/0day-ci/archive/20260120/202601200218.2dRYmU4Q-lkp@intel.com/config) compiler: nios2-linux-gcc (GCC) 11.5.0 smatch version: v0.5.0-8985-g2614ff1a 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202601200218.2dRYmU4Q-lkp@intel.com/ New smatch warnings: mm/slub.c:904 need_slab_obj_exts() warn: bitwise AND condition is false here Old smatch warnings: arch/nios2/include/asm/thread_info.h:62 current_thread_info() error: uninitialized symbol 'sp'. vim +904 mm/slub.c 4fad56bdb6b4c4b Harry Yoo 2026-01-13 890 4fad56bdb6b4c4b Harry Yoo 2026-01-13 891 /* 4fad56bdb6b4c4b Harry Yoo 2026-01-13 892 * Check if memory cgroup or memory allocation profiling is enabled. 4fad56bdb6b4c4b Harry Yoo 2026-01-13 893 * If enabled, SLUB tries to reduce memory overhead of accounting 4fad56bdb6b4c4b Harry Yoo 2026-01-13 894 * slab objects. If neither is enabled when this function is called, 4fad56bdb6b4c4b Harry Yoo 2026-01-13 895 * the optimization is simply skipped to avoid affecting caches that do not 4fad56bdb6b4c4b Harry Yoo 2026-01-13 896 * need slabobj_ext metadata. 4fad56bdb6b4c4b Harry Yoo 2026-01-13 897 * 4fad56bdb6b4c4b Harry Yoo 2026-01-13 898 * However, this may disable optimization when memory cgroup or memory 4fad56bdb6b4c4b Harry Yoo 2026-01-13 899 * allocation profiling is used, but slabs are created too early 4fad56bdb6b4c4b Harry Yoo 2026-01-13 900 * even before those subsystems are initialized. 4fad56bdb6b4c4b Harry Yoo 2026-01-13 901 */ 4fad56bdb6b4c4b Harry Yoo 2026-01-13 902 static inline bool need_slab_obj_exts(struct kmem_cache *s) 4fad56bdb6b4c4b Harry Yoo 2026-01-13 903 { 4fad56bdb6b4c4b Harry Yoo 2026-01-13 @904 if (memcg_kmem_online() && (s->flags & SLAB_ACCOUNT)) 4fad56bdb6b4c4b Harry Yoo 2026-01-13 905 return true; 4fad56bdb6b4c4b Harry Yoo 2026-01-13 906 4fad56bdb6b4c4b Harry Yoo 2026-01-13 907 if (mem_alloc_profiling_enabled()) 4fad56bdb6b4c4b Harry Yoo 2026-01-13 908 return true; 4fad56bdb6b4c4b Harry Yoo 2026-01-13 909 4fad56bdb6b4c4b Harry Yoo 2026-01-13 910 return false; 4fad56bdb6b4c4b Harry Yoo 2026-01-13 911 } 4fad56bdb6b4c4b Harry Yoo 2026-01-13 912 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki