[gourryinverse:scratch/gourry/managed_nodes/rfc6-numa 43/60] mm/page_alloc.c:4822 alloc_policy_private() warn: bitwise AND condition is false here

[gourryinverse:scratch/gourry/managed_nodes/rfc6-numa 43/60] mm/page_alloc.c:4822 alloc_policy_private() warn: bitwise AND condition is false here

[kernel test robot]

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/rfc6-numa
head:   be88f829e80a326906b4001c6c11a8aa63d31c08
commit: c045e1303ba8061703797dfc3ef81e05a2625537 [43/60] mm/page_alloc: return to common zonelists when relaxing a mask
:::::: branch date: 24 hours ago
:::::: commit date: 24 hours ago
config: arm-randconfig-r2201-20261022 (https://download.01.org/0day-ci/archive/20261023/202610230147.crhIrAuz-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.5.0
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/202610230147.crhIrAuz-lkp@intel.com/

smatch warnings:
mm/page_alloc.c:4822 alloc_policy_private() warn: bitwise AND condition is false here

vim +4822 mm/page_alloc.c

c045e1303ba806 Gregory Price (Meta  2026-10-13  4818) 
c045e1303ba806 Gregory Price (Meta  2026-10-13  4819) /* A private binding, or an ordinary mask naming a node that became private. */
c045e1303ba806 Gregory Price (Meta  2026-10-13  4820) static bool alloc_policy_private(const struct alloc_context *ac)
c045e1303ba806 Gregory Price (Meta  2026-10-13  4821) {
c045e1303ba806 Gregory Price (Meta  2026-10-13 @4822) 	if (ac->alloc_flags & ALLOC_ZONELIST_PRIVATE)
c045e1303ba806 Gregory Price (Meta  2026-10-13  4823) 		return true;
c045e1303ba806 Gregory Price (Meta  2026-10-13  4824) 	return ac->nodemask &&
c045e1303ba806 Gregory Price (Meta  2026-10-13  4825) 	       nodes_intersects(*ac->nodemask, node_states[N_MEMORY_PRIVATE]);
c045e1303ba806 Gregory Price (Meta  2026-10-13  4826) }
c045e1303ba806 Gregory Price (Meta  2026-10-13  4827) 

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