sysrq_key_op       53 include/linux/sysrq.h int register_sysrq_key(int key, struct sysrq_key_op *op);
sysrq_key_op       54 include/linux/sysrq.h int unregister_sysrq_key(int key, struct sysrq_key_op *op);
sysrq_key_op       55 include/linux/sysrq.h struct sysrq_key_op *__sysrq_get_key_op(int key);
sysrq_key_op       69 include/linux/sysrq.h static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
sysrq_key_op       74 include/linux/sysrq.h static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)