linux4.4.0内核编译出现如下问题，能帮解决一下吗?

fs/overlayfs/super.c: In function ‘ovl_init’:

fs/overlayfs/super.c:1311:30: error: ‘ovl_v1_fs_type’ undeclared (first use in this function)

ret = register_filesystem(&ovl_v1_fs_type);

^

fs/overlayfs/super.c:1311:30: 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:1324:26: error: ‘ovl_v1_fs_type’ undeclared (first use in this function)

unregister_filesystem(&ovl_v1_fs_type);

^

scripts/Makefile.build:269: recipe for target 'fs/overlayfs/super.o' failed

make[2]: *** [fs/overlayfs/super.o] Error 1

scripts/Makefile.build:476: recipe for target 'fs/overlayfs' failed

make[1]: *** [fs/overlayfs] Error 2

Makefile:983: recipe for target 'fs' failed

make: *** [fs] Error 2

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