在编译Linux内核4.4.0期间出现错误：
fs/overlayfs/super.c: In function ‘ovl_init’:
fs/overlayfs/super.c:1331:30: error: ‘ovl_v1_fs_type’ undeclared (first use in this function)
ret = register_filesystem(&ovl_v1_fs_type);
^
fs/overlayfs/super.c:1331:30: note: each undeclared identifier is reported only once for each function it appears in
fs/overlayfs/super.c: In function ‘ovl_exit’:
fs/overlayfs/super.c:1344:26: error: ‘ovl_v1_fs_type’ undeclared (first use in this function)
unregister_filesystem(&ovl_v1_fs_type);
^
scripts/Makefile.build:277: recipe for target 'fs/overlayfs/super.o' failed
make[4]: *** [fs/overlayfs/super.o] Error 1
scripts/Makefile.build:484: recipe for target 'fs/overlayfs' failed
make[3]: *** [fs/overlayfs] Error 2
Makefile:996: recipe for target 'fs' failed
make[2]: *** [fs] Error 2
scripts/package/Makefile:90: recipe for target 'deb-pkg' failed
make[1]: *** [deb-pkg] Error 2
Makefile:1286: recipe for target 'deb-pkg' failed
make: *** [deb-pkg] Error 2
其他信息：
处理器：Intel®Core™i3-3110M CPU @ 2.40GHz×4 OS类型：64位
图形：GeForce GT 720M / PCIe / SSE2
uname -a
Linux Khumayun 4.15.18 #1 SMP Sat Oct 13 22:05:33 +05 2018 x86_64 x86_64 x86_64 GNU/Linux