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X-CSE-ConnectionGUID: 4C8nY8VTTYK3Tsj/KcR6Yg== X-CSE-MsgGUID: NNvNZYu8TC+dy7fGL8+nFA== X-IronPort-AV: E=McAfee;i="6800,10657,11650"; a="90966472" X-IronPort-AV: E=Sophos;i="6.21,169,1763452800"; d="scan'208";a="90966472" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Dec 2025 17:40:56 -0800 X-CSE-ConnectionGUID: HH3KO3ruSFaqe8T5HyubLA== X-CSE-MsgGUID: zy40TVviR8+wEyDh/5xXGA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,169,1763452800"; d="scan'208";a="199966668" Received: from lkp-server02.sh.intel.com (HELO dd3453e2b682) ([10.239.97.151]) by fmviesa008.fm.intel.com with ESMTP; 22 Dec 2025 17:40:50 -0800 Received: from kbuild by dd3453e2b682 with local (Exim 4.98.2) (envelope-from ) id 1vXrOK-000000001Ij-25Ic; Tue, 23 Dec 2025 01:40:48 +0000 Date: Tue, 23 Dec 2025 09:40:39 +0800 From: kernel test robot To: Harry Yoo , akpm@linux-foundation.org, vbabka@suse.cz Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, andreyknvl@gmail.com, cl@gentwo.org, dvyukov@google.com, glider@google.com, hannes@cmpxchg.org, linux-mm@kvack.org, mhocko@kernel.org, muchun.song@linux.dev, rientjes@google.com, roman.gushchin@linux.dev, ryabinin.a.a@gmail.com, shakeel.butt@linux.dev, surenb@google.com, vincenzo.frascino@arm.com, yeoreum.yun@arm.com, harry.yoo@oracle.com, tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, hao.li@linux.dev Subject: Re: [PATCH V4 7/8] mm/slab: save memory by allocating slabobj_ext array from leftover Message-ID: <202512231042.EEBUajQY-lkp@intel.com> References: <20251222110843.980347-8-harry.yoo@oracle.com> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251222110843.980347-8-harry.yoo@oracle.com> Hi Harry, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] url: https://github.com/intel-lab-lkp/linux/commits/Harry-Yoo/mm-slab-use-unsigned-long-for-orig_size-to-ensure-proper-metadata-align/20251222-191144 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20251222110843.980347-8-harry.yoo%40oracle.com patch subject: [PATCH V4 7/8] mm/slab: save memory by allocating slabobj_ext array from leftover config: x86_64-buildonly-randconfig-001-20251223 (https://download.01.org/0day-ci/archive/20251223/202512231042.EEBUajQY-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/20251223/202512231042.EEBUajQY-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/202512231042.EEBUajQY-lkp@intel.com/ All errors (new ones prefixed by >>): mm/slub.c:2140:33: error: passing 'union codetag_ref' to parameter of incompatible type 'union codetag_ref *'; take the address with & 2140 | if (unlikely(is_codetag_empty(ext->ref))) { | ^~~~~~~~ | & include/linux/compiler.h:47:41: note: expanded from macro 'unlikely' 47 | # define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x))) | ^ include/linux/compiler.h:32:34: note: expanded from macro '__branch_check__' 32 | ______r = __builtin_expect(!!(x), expect); \ | ^ include/linux/alloc_tag.h:52:56: note: passing argument to parameter 'ref' here 52 | static inline bool is_codetag_empty(union codetag_ref *ref) | ^ mm/slub.c:2140:33: error: passing 'union codetag_ref' to parameter of incompatible type 'union codetag_ref *'; take the address with & 2140 | if (unlikely(is_codetag_empty(ext->ref))) { | ^~~~~~~~ | & include/linux/compiler.h:47:68: note: expanded from macro 'unlikely' 47 | # define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x))) | ^ include/linux/compiler.h:34:19: note: expanded from macro '__branch_check__' 34 | expect, is_constant); \ | ^~~~~~~~~~~ include/linux/alloc_tag.h:52:56: note: passing argument to parameter 'ref' here 52 | static inline bool is_codetag_empty(union codetag_ref *ref) | ^ >> mm/slub.c:2326:16: error: use of undeclared identifier 'MEMCG_DATA_OBJEXTS' 2326 | obj_exts |= MEMCG_DATA_OBJEXTS; | ^ 3 errors generated. vim +/MEMCG_DATA_OBJEXTS +2326 mm/slub.c 2302 2303 /* 2304 * Try to allocate slabobj_ext array from unused space. 2305 * This function must be called on a freshly allocated slab to prevent 2306 * concurrency problems. 2307 */ 2308 static void alloc_slab_obj_exts_early(struct kmem_cache *s, struct slab *slab) 2309 { 2310 void *addr; 2311 unsigned long obj_exts; 2312 2313 if (!need_slab_obj_exts(s)) 2314 return; 2315 2316 if (obj_exts_fit_within_slab_leftover(s, slab)) { 2317 addr = slab_address(slab) + obj_exts_offset_in_slab(s, slab); 2318 addr = kasan_reset_tag(addr); 2319 obj_exts = (unsigned long)addr; 2320 2321 get_slab_obj_exts(obj_exts); 2322 memset(addr, 0, obj_exts_size_in_slab(slab)); 2323 put_slab_obj_exts(obj_exts); 2324 2325 if (IS_ENABLED(CONFIG_MEMCG)) > 2326 obj_exts |= MEMCG_DATA_OBJEXTS; 2327 slab->obj_exts = obj_exts; 2328 slab_set_stride(slab, sizeof(struct slabobj_ext)); 2329 } 2330 } 2331 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki