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Wed, 3 Sep 2025 10:16:45 +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 X7UJKY0VuGiIAgAAD6G6ig (envelope-from ); Wed, 03 Sep 2025 10:16:45 +0000 Message-ID: Date: Wed, 3 Sep 2025 12:16:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] mm/show_mem: Add trylock while printing alloc info Content-Language: en-US To: kernel test robot , Yueyang Pan , Suren Baghdasaryan , Andrew Morton , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Vishal Moola , Shakeel Butt , Usama Arif Cc: oe-kbuild-all@lists.linux.dev, Linux Memory Management List , kernel-team@meta.com, linux-kernel@vger.kernel.org References: <1491df0ac12a7626b7c9b00e26a6e10adb8c9045.1756827906.git.pyyjason@gmail.com> <202509031744.HcibSETe-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: <202509031744.HcibSETe-lkp@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Queue-Id: 4FB7720005 X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: 9ibrxsfgfoxw6e1f81rps5cyz1gnstkg X-HE-Tag: 1756894608-737107 X-HE-Meta: U2FsdGVkX1+Zexf0v5s75l2Ylsisrlu8wW8lTXeecCquLqGhXDX/245/0ndRt2aH2b6XkWvOtkSMWTEfhaWcQ38a6a7A9axH/CEn/HtcSpYZVaV11XNrEwjWSTFspB07if0ZCtTxnAd6CsnvXT8sTZ1rzOrApOOCtctRfmEhWB1XkorvO9LXNBdCg7gWbpIrUJjugZVRt0hXeJAC5uxXcn7a3c/yGnnO3YF7duRi0oD4CH6r5FB8CzAimC/X/ZepyAN5MBgkjPAUbsE+yyo40rzErKbHe8inbvvx88mElrMgIaDXUbm6cxEgZF6jMroRTULg3kGDu1YEDVP08cKmoRQt1//62fNoU1prpEHk8zHtlOOwu1jn4Ut0pYjAWfpruokvq+I16F43gt5QM8PSPG8p1YJjCD6MBg65l5rDPQM7HywG3inveStFOf58WhOcJfTN2SNs10/ecb3IyVNo/KWgTTue58fNRgsTgEIFN7HFwsB5FitS5uW0iQL9JEgnVo9XwPQqw0PnhYPw0+9nd9Fft7CWBDOwMR5TTx+slWYYxHg5sZyKCQwRumZruyf4tIfqUOgkfSHOCPBDFmb4ULylPqL2WrRNXzo0AV4UOQCsq5GTBRXhZq8Yf8BSpyqt0T4FN1Oc0Qvv4nzoaT67mimsehoS+IXkceAiwqjTBCwohZXB9RgrHNMeS+Dk/8g6hk9I8E/OofJxVDvS+1k9D8XG6BcJHM+w+6WiehKeLLBPooob6r9STF0jATucXUYkXuxn3yqeRYHHISrht1B+nIi5FPM3POoH4jeE548YHjkHzVpNUkfYLAPQjaO957AiDkNfFEmDIE50Db8gdqxORleST613QPqgjsHnxx4aa9qSJx4sSjHRBTFqNgl6piotYa3NQKk1KvcOLxOjuBLslhpJ61rn7iBwatPs7bTbf1kGu1iVEl2bmgoIL7yJ1YZDLAuClPnswLBCOvZcl99 9n6YjqPy dYj26PjbjAX8OFjm/LItICwYkXI+CdhYV3ZTQbN0oKN46W7SE7wgt7E2PA1sXWCwutn6+LZNXYK6wOH7qbm3LozEpX7fiD/XByE3aC4uLvDCWLxcaQS4Wll4sRIP+Cci9DPuXVfBEJ0T2g2VUv6mpJVmRq7Ywb5NpqUGPUi9jShVLAdULewSpB6pNV0Nm69bGRsIXDgJBc028qwlV58Coa9wOgxGyD1d1LMsUYWLWzcwAX87h8ThQmE/u3aJF6HZJYyFPRX5D7vkbYVpaz4yus18d8PcpkIq0vZnC/w30iZNA308LxZDKHJ48LspuvfuCssF4O7YfnV+87qXR+a1xmImV5hKGb68dBqhgQo+TQPHac1OkMakJ8Qb0fmixb8vHf91zpU/TqbngC7EqV7JH6DI4URhv3/yaYqqsHfOrni76MCHqHyFmF8+KLom47537jW/RZ+lhmhuUvYmhVFz4rZLosAepRUQpH575fQ5VvUNm3akN3UxyIVdkQlEHBP7g/CuWz2KtM7JE9x/hQ+wOrjTfGQZLQSD2MpsYfmkA5jvvmDvBQwhqnbdNfA== 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 9/3/25 11:47, kernel test robot wrote: > Hi Yueyang, > > kernel test robot noticed the following build warnings: > > [auto build test WARNING on akpm-mm/mm-everything] > > url: https://github.com/intel-lab-lkp/linux/commits/Yueyang-Pan/mm-show_mem-Dump-the-status-of-the-mem-alloc-profiling-before-printing/20250903-000616 > base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything > patch link: https://lore.kernel.org/r/1491df0ac12a7626b7c9b00e26a6e10adb8c9045.1756827906.git.pyyjason%40gmail.com > patch subject: [PATCH v2 2/2] mm/show_mem: Add trylock while printing alloc info > config: i386-buildonly-randconfig-001-20250903 (https://download.01.org/0day-ci/archive/20250903/202509031744.HcibSETe-lkp@intel.com/config) > compiler: gcc-13 (Debian 13.3.0-16) 13.3.0 > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509031744.HcibSETe-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/202509031744.HcibSETe-lkp@intel.com/ > > All warnings (new ones prefixed by >>): > > In file included from mm/show_mem.c:18: > mm/show_mem.c: In function 'show_free_areas': > mm/show_mem.c:336:49: error: 'NR_ZSPAGES' undeclared (first use in this function); did you mean 'NR_STATS'? > 336 | K(zone_page_state(zone, NR_ZSPAGES)), > | ^~~~~~~~~~ This is from a different patch and being fixed. Interesting that lkp will report additional warnings even in presence of prior errors. > mm/internal.h:560:16: note: in definition of macro 'K' > 560 | #define K(x) ((x) << (PAGE_SHIFT-10)) > | ^ > include/linux/printk.h:512:26: note: in expansion of macro 'printk_index_wrap' > 512 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) > | ^~~~~~~~~~~~~~~~~ > mm/show_mem.c:298:17: note: in expansion of macro 'printk' > 298 | printk(KERN_CONT > | ^~~~~~ > mm/show_mem.c:336:49: note: each undeclared identifier is reported only once for each function it appears in > 336 | K(zone_page_state(zone, NR_ZSPAGES)), > | ^~~~~~~~~~ > mm/internal.h:560:16: note: in definition of macro 'K' > 560 | #define K(x) ((x) << (PAGE_SHIFT-10)) > | ^ > include/linux/printk.h:512:26: note: in expansion of macro 'printk_index_wrap' > 512 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) > | ^~~~~~~~~~~~~~~~~ > mm/show_mem.c:298:17: note: in expansion of macro 'printk' > 298 | printk(KERN_CONT > | ^~~~~~ > In file included from include/linux/spinlock.h:89, > from include/linux/wait.h:9, > from include/linux/wait_bit.h:8, > from include/linux/fs.h:7, > from include/linux/highmem.h:5, > from include/linux/bvec.h:10, > from include/linux/blk_types.h:10, > from include/linux/blkdev.h:9, > from mm/show_mem.c:8: > mm/show_mem.c: In function '__show_mem': >>> mm/show_mem.c:399:32: warning: unused variable 'mem_alloc_profiling_spinlock' [-Wunused-variable] > 399 | static DEFINE_SPINLOCK(mem_alloc_profiling_spinlock); This is the warning I think you can simply move the definition to the existing #ifdef CONFIG_MEM_ALLOC_PROFILING block above the spin_trylock(). The kernel now uses a new enough C standard to allow this and not only at the beginning of a cuntion. While not encouraged to do that in general, this seems to be a valid use case. > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ > include/linux/spinlock_types.h:43:44: note: in definition of macro 'DEFINE_SPINLOCK' > 43 | #define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) > | ^ > > > vim +/mem_alloc_profiling_spinlock +399 mm/show_mem.c > > 396 > 397 void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx) > 398 { > > 399 static DEFINE_SPINLOCK(mem_alloc_profiling_spinlock); >