uhh...

root@jacob-System-Product-Name:/home/jacob/Desktop/cyan/device/lge/l1v/kernel/fs# ls
9p                  binfmt_em86.c    coda                 efs          filesystems.c   hugetlbfs         libfs.c      nfsd         proc              signalfd.c          ubifs
adfs                binfmt_flat.c    compat_binfmt_elf.c  eventfd.c    file_table.c    inode.c           lockd        nilfs2       proc_namespace.c  splice.c            udf
affs                binfmt_misc.c    compat.c             eventpoll.c  freevxfs        internal.h        locks.c      nls          pstore            squashfs            ufs
afs                 binfmt_script.c  compat_ioctl.c       exec.c       fscache         ioctl.c           logfs        no-block.c   qnx4              sreadahead_prof.c   utimes.c
aio.c               binfmt_som.c     configfs             exofs        fs_struct.c     ioprio.c          Makefile     notify       qnx6              sreadahead_prof.h   xattr_acl.c
anon_inodes.c       bio.c            cramfs               exportfs     fs-writeback.c  isofs             mbcache.c    ntfs         quota             sreadahead_profi.h  xattr.c
attr.c              bio-integrity.c  dcache.c             ext2         fuse            jbd               minix        ocfs2        ramfs             stack.c             xfs
autofs4             block_dev.c      dcookies.c           ext3         generic_acl.c   jbd2              mount.h      omfs         readdir.c         stat.c              yaffs2
bad_inode.c         btrfs            debugfs              ext4         gfs2            jffs2             mpage.c      open.c       read_write.c      statfs.c
befs                buffer.c         devpts               fat          hfs             jfs               namei.c      openpromfs   read_write.h      super.c
bfs                 cachefiles       direct-io.c          fcntl.c      hfsplus         Kconfig           namespace.c  pipe.c       reiserfs          sync.c
binfmt_aout.c       ceph             dlm                  fhandle.c    hostfs          Kconfig.binfmt    ncpfs        pnode.c      romfs             sysfs
binfmt_elf.c        char_dev.c       drop_caches.c        fifo.c       hpfs            LGSDEncManager.c  nfs          pnode.h      select.c          sysv
binfmt_elf_fdpic.c  cifs             ecryptfs             file.c       hppfs           LGSDEncManager.h  nfs_common   posix_acl.c  seq_file.c        timerfd.c
root@jacob-System-Product-Name:/home/jacob/Desktop/cyan/device/lge/l1v/kernel/fs# cat Makefile | grep EXTRA
EXTRA_CFLAGS=-W