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a="3500238" X-IronPort-AV: E=Sophos;i="6.27,212,1787036400"; d="scan'208";a="3500238" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Nov 2026 09:11:23 -0800 X-CSE-ConnectionGUID: R/Etu5amTUaDe9kfeyWTEw== X-CSE-MsgGUID: lFSp4hyoQT2vw8iR/tj7TQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,212,1787036400"; d="scan'208";a="8782953" Received: from lkp-server01.sh.intel.com (HELO 0caa9d2d175c) ([10.239.97.150]) by orviesa008.jf.intel.com with ESMTP; 13 Nov 2026 09:11:20 -0800 Received: from kbuild by 0caa9d2d175c with local (Exim 4.98.2) (envelope-from ) id 1xRuo1-000000013PL-1kla; Fri, 13 Nov 2026 17:11:17 +0000 Date: Sat, 14 Nov 2026 01:10:22 +0800 From: kernel test robot To: Baolin Wang , akpm@linux-foundation.org, david@kernel.org, hannes@cmpxchg.org, kasong@tencent.com Cc: oe-kbuild-all@lists.linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, baoquan.he@linux.dev, qi.zheng@linux.dev, shakeel.butt@linux.dev, mhocko@kernel.org, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: mglru: use pte_table_clamped_end() helper to calculate the end Message-ID: <202611140137.58xBD8xH-lkp@intel.com> References: 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: Hi Baolin, 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/Baolin-Wang/mm-mglru-use-pte_table_clamped_end-helper-to-calculate-the-end/20261112-191239 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/b2386c5da61f9a15e60daa421b033bc1e0bcdd41.1794481498.git.baolin.wang%40linux.alibaba.com patch subject: [PATCH] mm: mglru: use pte_table_clamped_end() helper to calculate the end config: x86_64-rhel-9.4-ltp (https://download.01.org/0day-ci/archive/20261114/202611140137.58xBD8xH-lkp@intel.com/config) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261114/202611140137.58xBD8xH-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/202611140137.58xBD8xH-lkp@intel.com/ All errors (new ones prefixed by >>): mm/vmscan.c: In function 'lru_gen_look_around': >> mm/vmscan.c:4343:15: error: implicit declaration of function 'pte_table_clamped_end' [-Wimplicit-function-declaration] 4343 | end = pte_table_clamped_end(addr, vma->vm_end); | ^~~~~~~~~~~~~~~~~~~~~ vim +/pte_table_clamped_end +4343 mm/vmscan.c 4296 4297 /****************************************************************************** 4298 * rmap/PT walk feedback 4299 ******************************************************************************/ 4300 4301 /* 4302 * This function exploits spatial locality when shrink_folio_list() walks the 4303 * rmap. It scans the adjacent PTEs of a young PTE and promotes hot pages. If 4304 * the scan was done cacheline efficiently, it adds the PMD entry pointing to 4305 * the PTE table to the Bloom filter. This forms a feedback loop between the 4306 * eviction and the aging. 4307 */ 4308 bool lru_gen_look_around(struct page_vma_mapped_walk *pvmw, unsigned int nr) 4309 { 4310 int i; 4311 bool dirty; 4312 unsigned long start; 4313 unsigned long end; 4314 struct lru_gen_mm_walk *walk; 4315 struct folio *last = NULL; 4316 int young = nr; 4317 pte_t *pte = pvmw->pte; 4318 unsigned long addr = pvmw->address; 4319 struct vm_area_struct *vma = pvmw->vma; 4320 struct folio *folio = pfn_folio(pvmw->pfn); 4321 struct mem_cgroup *memcg; 4322 struct pglist_data *pgdat = folio_pgdat(folio); 4323 struct lruvec *lruvec; 4324 struct lru_gen_mm_state *mm_state; 4325 4326 lockdep_assert_held(pvmw->ptl); 4327 VM_WARN_ON_ONCE_FOLIO(folio_test_lru(folio), folio); 4328 4329 if (!test_and_clear_young_ptes_notify(vma, addr, pte, nr)) 4330 return false; 4331 4332 if (spin_is_contended(pvmw->ptl)) 4333 return true; 4334 4335 /* exclude non-mm-backed VMAs containing anon pages from COW */ 4336 if (!vma_is_mm_backed(vma)) 4337 return true; 4338 4339 /* avoid taking the LRU lock under the PTL when possible */ 4340 walk = current->reclaim_state ? current->reclaim_state->mm_walk : NULL; 4341 4342 start = max(addr & PMD_MASK, vma->vm_start); > 4343 end = pte_table_clamped_end(addr, vma->vm_end); 4344 4345 if (end - start == PAGE_SIZE) 4346 return true; 4347 4348 if (end - start > MIN_LRU_BATCH * PAGE_SIZE) { 4349 if (addr - start < MIN_LRU_BATCH * PAGE_SIZE / 2) 4350 end = start + MIN_LRU_BATCH * PAGE_SIZE; 4351 else if (end - addr < MIN_LRU_BATCH * PAGE_SIZE / 2) 4352 start = end - MIN_LRU_BATCH * PAGE_SIZE; 4353 else { 4354 start = addr - MIN_LRU_BATCH * PAGE_SIZE / 2; 4355 end = addr + MIN_LRU_BATCH * PAGE_SIZE / 2; 4356 } 4357 } 4358 4359 memcg = get_mem_cgroup_from_folio(folio); 4360 lruvec = mem_cgroup_lruvec(memcg, pgdat); 4361 mm_state = get_mm_state(lruvec); 4362 4363 lazy_mmu_mode_enable(); 4364 4365 pte -= (addr - start) / PAGE_SIZE; 4366 4367 for (i = 0, addr = start; addr != end; 4368 i += nr, pte += nr, addr += nr * PAGE_SIZE) { 4369 unsigned long pfn; 4370 pte_t ptent = ptep_get(pte); 4371 4372 nr = 1; 4373 pfn = get_pte_pfn(ptent, vma, addr, pgdat); 4374 if (pfn == -1) 4375 continue; 4376 4377 folio = get_pfn_folio(pfn, memcg, pgdat); 4378 if (!folio) 4379 continue; 4380 4381 if (folio_test_large(folio)) { 4382 const unsigned int max_nr = (end - addr) >> PAGE_SHIFT; 4383 4384 nr = folio_pte_batch_flags(folio, NULL, pte, &ptent, 4385 max_nr, FPB_MERGE_YOUNG_DIRTY); 4386 } 4387 4388 if (!test_and_clear_young_ptes_notify(vma, addr, pte, nr)) 4389 continue; 4390 4391 if (last != folio) { 4392 walk_update_folio(walk, vma, lruvec, last, dirty); 4393 4394 last = folio; 4395 dirty = false; 4396 } 4397 4398 if (pte_dirty(ptent)) 4399 dirty = true; 4400 4401 young += nr; 4402 } 4403 4404 walk_update_folio(walk, vma, lruvec, last, dirty); 4405 4406 lazy_mmu_mode_disable(); 4407 4408 /* feedback from rmap walkers to page table walkers */ 4409 if (mm_state && suitable_to_scan(i, young)) 4410 update_bloom_filter(mm_state, READ_ONCE(lruvec->lrugen.max_seq), 4411 pvmw->pmd); 4412 4413 mem_cgroup_put(memcg); 4414 4415 return true; 4416 } 4417 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki