[sashal-linux-stable-security:linux-3.10.y-security 204/1330] ipc/shm.c:923:3: error: implicit declaration of function 'shm_obtain_object_check'

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable-security.git linux-3.10.y-security
head:   5727b476fa7962e1849e7ba00870eb62dd1c9592
commit: fc3323c39215f276c710a0eaad6fbf78bafa4eac [204/1330] ipc,shm: shorten critical region for shmctl
config: i386-defconfig (attached as .config)
compiler: gcc-4.9 (Debian 4.9.3-14) 4.9.3
reproduce:
        git checkout fc3323c39215f276c710a0eaad6fbf78bafa4eac
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   ipc/shm.c: In function 'SYSC_shmctl':
>> ipc/shm.c:923:3: error: implicit declaration of function 'shm_obtain_object_check' [-Werror=implicit-function-declaration]
      shp = shm_obtain_object_check(ns, shmid);
      ^
>> ipc/shm.c:923:7: warning: assignment makes pointer from integer without a cast
      shp = shm_obtain_object_check(ns, shmid);
          ^
>> ipc/shm.c:966:3: error: implicit declaration of function 'ipc_unlock_object' [-Werror=implicit-function-declaration]
      ipc_unlock_object(&shp->shm_perm);
      ^
   cc1: some warnings being treated as errors

vim +/shm_obtain_object_check +923 ipc/shm.c

   917		case SHM_LOCK:
   918		case SHM_UNLOCK:
   919		{
   920			struct file *shm_file;
   921	
   922			rcu_read_lock();
 > 923			shp = shm_obtain_object_check(ns, shmid);
   924			if (IS_ERR(shp)) {
   925				err = PTR_ERR(shp);
   926				goto out_unlock1;
   927			}
   928	
   929			audit_ipc_obj(&(shp->shm_perm));
   930			err = security_shm_shmctl(shp, cmd);
   931			if (err)
   932				goto out_unlock1;
   933	
   934			ipc_lock_object(&shp->shm_perm);
   935			if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
   936				kuid_t euid = current_euid();
   937				err = -EPERM;
   938				if (!uid_eq(euid, shp->shm_perm.uid) &&
   939				    !uid_eq(euid, shp->shm_perm.cuid))
   940					goto out_unlock0;
   941				if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
   942					goto out_unlock0;
   943			}
   944	
   945			shm_file = shp->shm_file;
   946			if (is_file_hugepages(shm_file))
   947				goto out_unlock0;
   948	
   949			if (cmd == SHM_LOCK) {
   950				struct user_struct *user = current_user();
   951				err = shmem_lock(shm_file, 1, user);
   952				if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) {
   953					shp->shm_perm.mode |= SHM_LOCKED;
   954					shp->mlock_user = user;
   955				}
   956				goto out_unlock0;
   957			}
   958	
   959			/* SHM_UNLOCK */
   960			if (!(shp->shm_perm.mode & SHM_LOCKED))
   961				goto out_unlock0;
   962			shmem_lock(shm_file, 0, shp->mlock_user);
   963			shp->shm_perm.mode &= ~SHM_LOCKED;
   964			shp->mlock_user = NULL;
   965			get_file(shm_file);
 > 966			ipc_unlock_object(&shp->shm_perm);
   967			rcu_read_unlock();
   968			shmem_unlock_mapping(shm_file->f_mapping);
   969	

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