* Re: [PATCH v4] mm: assert exclusive nid/zonenum bits at the page/folio access sites
[not found] <20260625053958.918738-1-hui.zhu@linux.dev>
@ 2026-06-25 6:50 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-06-25 6:50 UTC (permalink / raw)
To: Hui Zhu, Andrew Morton, David Hildenbrand, Lorenzo Stoakes,
Liam R. Howlett, Vlastimil Babka, Mike Rapoport,
Suren Baghdasaryan, Michal Hocko, Kairui Song, Qi Zheng,
Shakeel Butt, Barry Song, Axel Rasmussen, Yuanchu Xie, Wei Xu,
linux-kernel
Cc: llvm, oe-kbuild-all, Linux Memory Management List, Hui Zhu
Hi Hui,
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/Hui-Zhu/mm-assert-exclusive-nid-zonenum-bits-at-the-page-folio-access-sites/20260625-134106
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20260625053958.918738-1-hui.zhu%40linux.dev
patch subject: [PATCH v4] mm: assert exclusive nid/zonenum bits at the page/folio access sites
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260625/202606251454.M74ab4Rw-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 6cc609bb250b21b47fc7d394b4019101e9983597)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260625/202606251454.M74ab4Rw-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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606251454.M74ab4Rw-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/fork.c:258:18: warning: unused variable 'page' [-Wunused-variable]
258 | struct page *page = vm_area->pages[i];
| ^~~~
1 warning generated.
vim +/page +258 kernel/fork.c
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 240
449e0b4ed5a16c7 Pasha Tatashin 2025-05-09 241 static bool try_release_thread_stack_to_cache(struct vm_struct *vm_area)
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 242 {
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 243 unsigned int i;
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 244 int nid;
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 245
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 246 /*
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 247 * Don't cache stacks if any of the pages don't match the local domain, unless
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 248 * there is no local memory to begin with.
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 249 *
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 250 * Note that lack of local memory does not automatically mean it makes no difference
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 251 * performance-wise which other domain backs the stack. In this case we are merely
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 252 * trying to avoid constantly going to vmalloc.
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 253 */
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 254 scoped_guard(preempt) {
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 255 nid = numa_node_id();
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 256 if (node_state(nid, N_MEMORY)) {
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 257 for (i = 0; i < vm_area->nr_pages; i++) {
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 @258 struct page *page = vm_area->pages[i];
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 259 if (page_to_nid(page) != nid)
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 260 return false;
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 261 }
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 262 }
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 263
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 264 for (i = 0; i < NR_CACHED_STACKS; i++) {
47e39c793367600 Uros Bizjak 2024-05-23 265 struct vm_struct *tmp = NULL;
47e39c793367600 Uros Bizjak 2024-05-23 266
449e0b4ed5a16c7 Pasha Tatashin 2025-05-09 267 if (this_cpu_try_cmpxchg(cached_stacks[i], &tmp, vm_area))
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 268 return true;
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 269 }
262ef8e55b7ccd4 Mateusz Guzik 2025-11-20 270 }
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 271 return false;
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 272 }
e540bf3162e822d Sebastian Andrzej Siewior 2022-02-17 273
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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