.TP
.BR LINUX_REBOOT_CMD_KEXEC
.RB ( RB_KEXEC ,
-0x45584543, since Linux Linux 2.6.13)
+0x45584543, since Linux 2.6.13).
Execute a kernel that has been loaded earlier with
.BR kexec_load (2).
This option is available only if the kernel was configured with