shmem_lock         64 include/linux/shmem_fs.h extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
shmem_lock        289 ipc/shm.c      		shmem_lock(shm_file, 0, shp->mlock_user);
shmem_lock       1111 ipc/shm.c      		err = shmem_lock(shm_file, 1, user);
shmem_lock       1122 ipc/shm.c      	shmem_lock(shm_file, 0, shp->mlock_user);