fatal error: locking.h: No such file or directory #include "locking.h" in 3.18kernel

[rbmedisettii09]

fs/btrfs/ctree.c:26:21: fatal error: locking.h: No such file or directory
#include "locking.h"
^
compilation terminated.
make[2]: *** [fs/btrfs/ctree.o] Error 1
make[1]: *** [fs/btrfs] Error 2
make: *** [fs] Error 2
rajendra@rajendra9:/km/projects/rpi/kernel/linux-rpi-3.18.y$ ^C
rajendra@rajendra9:/km/projects/rpi/kernel/linux-rpi-3.18.y$ make ARCH=arm clean
CLEAN .
CLEAN arch/arm/kernel
./scripts/Makefile.clean:17: drivers/media/usb/hdpvr/Makefile: No such file or directory
make[4]: *** No rule to make target `drivers/media/usb/hdpvr/Makefile'. Stop.
make[3]: *** [drivers/media/usb/hdpvr] Error 2
make[2]: *** [drivers/media/usb] Error 2
make[1]: *** [drivers/media] Error 2
make: *** [_clean_drivers] Error 2

[popcornmix]

Are you following the instructions here?
https://www.raspberrypi.org/documentation/linux/kernel/building.md

What platform are you building on? How did you get the kernel source?
Do you have a file fs/btrfs/locking.h?

Note that 3.18 is no longer supported by us. Updating to 4.1 or 4.4 would be recommended.