__kfifo_from_user  600 include/linux/kfifo.h 	__kfifo_from_user(__kfifo, __from, __len, __copied); \
__kfifo_from_user  772 include/linux/kfifo.h extern int __kfifo_from_user(struct __kfifo *fifo,
__kfifo_from_user  234 lib/kfifo.c    EXPORT_SYMBOL(__kfifo_from_user);