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Fri, 12 Sep 2025 13:23:10 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id pPF/Mr4exGgpEAAAD6G6ig (envelope-from ); Fri, 12 Sep 2025 13:23:10 +0000 Message-ID: <8fe99133-3322-4e39-9b58-80df547b8d1f@suse.cz> Date: Fri, 12 Sep 2025 15:23:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [vbabka-slab:slab/for-6.18/kmalloc_nolock 14/14] mm/slub.c:3866:2: warning: variable 'flags' is used uninitialized whenever '&&' condition is false Content-Language: en-US To: kernel test robot , Alexei Starovoitov , Harry Yoo Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-mm@kvack.org References: <202509121822.aOV6H1ts-lkp@intel.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <202509121822.aOV6H1ts-lkp@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 76019C0003 X-Stat-Signature: 9n6f7u1epitk6bb14kensinczy16u34w X-Rspam-User: X-HE-Tag: 1757683394-295864 X-HE-Meta: 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 v7wlia3j hL8aJtb2LhpDJbYppuOfTVs710c0o+mMs+N5PJYlW5iqkKUhd0X7Hm+UOowQYTN9kSaXl6gMbr4r3JVK5277dbY5ju0l5T7CRINspnCGnVNx4WG8GrZ4ylAPJRPoF+dBm/tJag1B/BxIfWOdRbgbRKgRC3cNLYihQRZ4FgPexYGPp42L10a0G1r9qXRS4OM4uFOhbYJsRYdIdNcv/iB9F/ERVAvMgzYeAg+ZdwnbarO4O2lnU9Lu5HiP0iXHjTAZuWBMORg4F6MzWcS8241G7pHZCzj5cxQ9ATz6nvyUdzDEOAQXMlS4muzNBZty7TJmTsIktqXB3A+FRdPwWAWq3QmllRbBC48wsJzSTZxQ2ebUn3nHezRb3tjnmtW8rvvyFMUzC1/rDCLstiXmf6iHDai1Ts2HT0aHEn0cmxV/WKlINsho= 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: On 9/12/25 12:25, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git slab/for-6.18/kmalloc_nolock > head: 8014922e0e72dde7684abebeab3404720401679f > commit: 8014922e0e72dde7684abebeab3404720401679f [14/14] slab: Introduce kmalloc_nolock() and kfree_nolock(). > config: x86_64-buildonly-randconfig-004-20250912 (https://download.01.org/0day-ci/archive/20250912/202509121822.aOV6H1ts-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/20250912/202509121822.aOV6H1ts-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/202509121822.aOV6H1ts-lkp@intel.com/ > > All warnings (new ones prefixed by >>): > >>> mm/slub.c:3866:2: warning: variable 'flags' is used uninitialized whenever '&&' condition is false [-Wsometimes-uninitialized] > 3866 | local_lock_cpu_slab(s, flags); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/slub.c:3776:2: note: expanded from macro 'local_lock_cpu_slab' > 3776 | lockdep_assert(local_trylock_irqsave(&(s)->cpu_slab->lock, flags)) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > include/linux/lockdep.h:279:15: note: expanded from macro 'lockdep_assert' > 279 | do { WARN_ON(debug_locks && !(cond)); } while (0) > | ^~~~~~~~~~~ > include/asm-generic/bug.h:171:25: note: expanded from macro 'WARN_ON' > 171 | int __ret_warn_on = !!(condition); \ > | ^~~~~~~~~ > mm/slub.c:3891:27: note: uninitialized use occurs here > 3891 | local_unlock_cpu_slab(s, flags); > | ^~~~~ > mm/slub.c:3780:48: note: expanded from macro 'local_unlock_cpu_slab' > 3780 | local_unlock_irqrestore(&(s)->cpu_slab->lock, flags) > | ^~~~~ > include/linux/local_lock.h:52:48: note: expanded from macro 'local_unlock_irqrestore' > 52 | __local_unlock_irqrestore(this_cpu_ptr(lock), flags) > | ^~~~~ > include/linux/local_lock_internal.h:202:21: note: expanded from macro '__local_unlock_irqrestore' > 202 | local_irq_restore(flags); \ > | ^~~~~ > include/linux/irqflags.h:240:61: note: expanded from macro 'local_irq_restore' > 240 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) > | ^~~~~ > include/linux/irqflags.h:179:26: note: expanded from macro 'raw_local_irq_restore' > 179 | arch_local_irq_restore(flags); \ > | ^~~~~ > mm/slub.c:3866:2: note: remove the '&&' if its condition is always true > 3866 | local_lock_cpu_slab(s, flags); > | ^ > mm/slub.c:3776:2: note: expanded from macro 'local_lock_cpu_slab' > 3776 | lockdep_assert(local_trylock_irqsave(&(s)->cpu_slab->lock, flags)) > | ^ > include/linux/lockdep.h:279:15: note: expanded from macro 'lockdep_assert' > 279 | do { WARN_ON(debug_locks && !(cond)); } while (0) > | ^ > mm/slub.c:3863:21: note: initialize the variable 'flags' to silence this warning > 3863 | unsigned long flags; > | ^ > | = 0 > 1 warning generated. > > > vim +3866 mm/slub.c > 3852 > 3853 /* > 3854 * Put a slab into a partial slab slot if available. > 3855 * > 3856 * If we did not find a slot then simply move all the partials to the > 3857 * per node partial list. > 3858 */ > 3859 static void put_cpu_partial(struct kmem_cache *s, struct slab *slab, int drain) > 3860 { > 3861 struct slab *oldslab; > 3862 struct slab *slab_to_put = NULL; > 3863 unsigned long flags; > 3864 int slabs = 0; > 3865 >> 3866 local_lock_cpu_slab(s, flags); I guess this? --- a/mm/slub.c +++ b/mm/slub.c @@ -3772,8 +3772,11 @@ static void deactivate_slab(struct kmem_cache *s, struct slab *slab, #define local_lock_cpu_slab(s, flags) \ local_lock_irqsave(&(s)->cpu_slab->lock, flags) #else -#define local_lock_cpu_slab(s, flags) \ - lockdep_assert(local_trylock_irqsave(&(s)->cpu_slab->lock, flags)) +#define local_lock_cpu_slab(s, flags) \ + do { \ + bool __l = local_trylock_irqsave(&(s)->cpu_slab->lock, flags); \ + lockdep_assert(__l); \ + } while (0) #endif