extern int crash_shutdown_register(crash_shutdown_t handler);
extern int crash_shutdown_unregister(crash_shutdown_t handler);
-extern void machine_kexec_simple(struct kimage *image);
extern void crash_kexec_secondary(struct pt_regs *regs);
extern int overlaps_crashkernel(unsigned long start, unsigned long size);
extern void reserve_crashkernel(void);