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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Subject: Re: [PATCH 3/6] mm/folio, mm/mlock: Don't batch folios in per-CPU LRU caches on isolated CPUs Message-ID: <202611032138.4bxGcYLC-lkp@intel.com> References: <20261103075940.110308-4-matthew.ruffell@canonical.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261103075940.110308-4-matthew.ruffell@canonical.com> Hi Matthew, 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/Matthew-Ruffell/sched-isolation-Consider-nohz_full-CPUs-isolated-in-cpu_is_isolated-again/20261103-205935 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20261103075940.110308-4-matthew.ruffell%40canonical.com patch subject: [PATCH 3/6] mm/folio, mm/mlock: Don't batch folios in per-CPU LRU caches on isolated CPUs config: sh-allnoconfig (https://download.01.org/0day-ci/archive/20261103/202611032138.4bxGcYLC-lkp@intel.com/config) compiler: sh4-linux-gcc (GCC) 16.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261103/202611032138.4bxGcYLC-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/202611032138.4bxGcYLC-lkp@intel.com/ All errors (new ones prefixed by >>): mm/folio.c: In function '__folio_batch_add_and_move': >> mm/folio.c:293:13: error: implicit declaration of function 'lru_batching_bypassed' [-Wimplicit-function-declaration] 293 | if (lru_batching_bypassed()) | ^~~~~~~~~~~~~~~~~~~~~ vim +/lru_batching_bypassed +293 mm/folio.c 280 281 static void __folio_batch_add_and_move(struct folio_batch __percpu *fbatch, 282 struct folio *folio, move_fn_t move_fn, bool disable_irq) 283 { 284 unsigned long flags; 285 286 folio_get(folio); 287 288 if (disable_irq) 289 local_lock_irqsave(&cpu_fbatches.lock_irq, flags); 290 else 291 local_lock(&cpu_fbatches.lock); 292 > 293 if (lru_batching_bypassed()) 294 folio_move_lru_now(folio, move_fn); 295 else if (!folio_batch_add(this_cpu_ptr(fbatch), folio) || 296 !folio_may_be_lru_cached(folio) || lru_cache_disabled()) 297 folio_batch_move_lru(this_cpu_ptr(fbatch), move_fn); 298 299 if (disable_irq) 300 local_unlock_irqrestore(&cpu_fbatches.lock_irq, flags); 301 else 302 local_unlock(&cpu_fbatches.lock); 303 } 304 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki