[openeuler:OLK-6.6 2257/2257] mm/mempolicy.c:1115:32: warning: variable 'vma' set but not used

[kernel test robot <lkp@intel.com>]

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   e69c6375f883badcc9ec4c9e9ed85660ac3fb1bf
commit: dba69db9a5fc7c2c9c0cda0f32bb3b5f3d73ef93 [2257/2257] mm/damon/vaddr: Add demotion interface for migrating cold pages to target nodemask
config: x86_64-buildonly-randconfig-002-20250520 (https://download.01.org/0day-ci/archive/20250520/202505201856.VGaOEUgd-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250520/202505201856.VGaOEUgd-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/202505201856.VGaOEUgd-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/mempolicy.c: In function 'migrate_area_to_node':
>> mm/mempolicy.c:1115:32: warning: variable 'vma' set but not used [-Wunused-but-set-variable]
    1115 |         struct vm_area_struct *vma;
         |                                ^~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for PTP_1588_CLOCK
   Depends on [n]: NET [=y] && POSIX_TIMERS [=n]
   Selected by [y]:
   - SXE [=y] && NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_LINKDATA [=y] && (X86 [=y] || ARM64) && PCI [=y]
   - SXE_VF [=y] && NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_LINKDATA [=y] && (X86 [=y] || ARM64) && PCI [=y]


vim +/vma +1115 mm/mempolicy.c

  1106	
  1107	/*
  1108	 * Migrate area pages from one node to a target node.
  1109	 * Returns error or the number of pages not migrated.
  1110	 */
  1111	static int migrate_area_to_node(struct mm_struct *mm, int source, int dest,
  1112				   unsigned long start, unsigned long end, int flags)
  1113	{
  1114		nodemask_t nmask;
> 1115		struct vm_area_struct *vma;
  1116		LIST_HEAD(pagelist);
  1117		int err = 0;
  1118		struct migration_target_control mtc = {
  1119			.nid = dest,
  1120			.gfp_mask = GFP_HIGHUSER_MOVABLE | __GFP_THISNODE,
  1121		};
  1122	
  1123		nodes_clear(nmask);
  1124		node_set(source, nmask);
  1125	
  1126		/*
  1127		 * This does not "check" the range but isolates all pages that
  1128		 * need migration.  Between passing in the full user address
  1129		 * space range and MPOL_MF_DISCONTIG_OK, this call can not fail.
  1130		 */
  1131		vma = find_vma(mm, 0);
  1132		VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)));
  1133		queue_pages_range(mm, start, end, &nmask,
  1134				flags | MPOL_MF_DISCONTIG_OK, &pagelist, false);
  1135	
  1136		if (!list_empty(&pagelist)) {
  1137			err = migrate_pages(&pagelist, alloc_migration_target, NULL,
  1138					(unsigned long)&mtc, MIGRATE_SYNC, MR_DAMON_DEMOTION, NULL);
  1139			if (err)
  1140				putback_movable_pages(&pagelist);
  1141		}
  1142	
  1143		return err;
  1144	}
  1145	

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