From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Dan Carpenter <error27@gmail.com>
Subject: [gourryinverse:scratch/gourry/managed_nodes/n_memory_features 38/58] mm/page_alloc.c:4804 check_retry_private() warn: bitwise AND condition is false here
Date: Sat, 14 Nov 2026 12:18:34 +0100 [thread overview]
Message-ID: <202611141203.DgUJcomz-lkp@intel.com> (raw)
Unfiltered warning: this smatch report is sent as-is and has not been
reviewed for false positives, so please treat it with due skepticism.
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: Gregory Price <gourry@gourry.net>
TO: "Gregory Price (Meta)" <gourry@gourry.net>
tree: https://github.com/gourryinverse/linux scratch/gourry/managed_nodes/n_memory_features
head: 82ebacf36393992b1a30dcbf1826f73f6bc34f1d
commit: 61ca25fef1e1cd792c1fd8328734121c5347afd0 [38/58] mm/page_alloc: return to common zonelists when relaxing a mask
:::::: branch date: 12 hours ago
:::::: commit date: 12 hours ago
config: mips-randconfig-2200-20261114 (https://download.01.org/0day-ci/archive/20261114/202611141203.DgUJcomz-lkp@intel.com/config)
compiler: mips64-linux-gcc (GCC) 15.3.0
smatch: v0.5.0-9187-g5189e3fb
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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202611141203.DgUJcomz-lkp@intel.com/
smatch warnings:
mm/page_alloc.c:4804 check_retry_private() warn: bitwise AND condition is false here
vim +4804 mm/page_alloc.c
902b62810a57ba Vlastimil Babka 2017-07-06 4793
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4794) /*
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4795) * A private request stays strict while its zonelist holds an allowed node.
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4796) * Recheck the cpuset and zonelist cookies before relaxing it to common memory.
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4797) */
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4798) static bool check_retry_private(gfp_t gfp, int cpuset_mems_cookie,
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4799) unsigned int zonelist_iter_cookie,
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4800) struct alloc_context *ac)
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4801) {
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4802) /* A strict local private request keeps its allocation domain. */
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4803) bool policy_valid = ((gfp & __GFP_THISNODE) &&
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 @4804) (ac->alloc_flags & ALLOC_ZONELIST_PRIVATE)) ||
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4805) alloc_policy_valid(ac);
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4806)
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4807) if (read_mems_allowed_retry(cpuset_mems_cookie) ||
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4808) check_retry_zonelist(zonelist_iter_cookie))
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4809) return true;
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4810) if (policy_valid)
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4811) return false;
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4812)
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4813) ac->nodemask = NULL;
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4814) ac->alloc_flags &= ~ALLOC_ZONELIST_PRIVATE;
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4815) ac->zonelist = node_zonelist(ac->preferred_nid, gfp);
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4816) return true;
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4817) }
61ca25fef1e1cd Gregory Price (Meta 2026-10-13 4818)
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-11-14 11:18 UTC|newest]
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