85  *      console is an unsafe state. It is used only in panic() by the final
88  *      Note that separate record buffers are used in panic(). As a result,
100  *   - Protection of the panic CPU.
176  * (such as panic with CONSOLE_REPLAY_ALL).
229  *	-EPERM:		A panic is in progress and this is neither the panic
247 		 * Panic does not imply that the console is owned. However,  in nbcon_context_try_acquire_direct()
248 		 * since all non-panic CPUs are stopped during panic(), it  in nbcon_context_try_acquire_direct()
253 		 * a direct acquire in panic. This gives console drivers an  in nbcon_context_try_acquire_direct()
255 		 * interrupted by the panic CPU while printing.  in nbcon_context_try_acquire_direct()
295 	 * - Only one CPU is allowed to request PANIC priority.  in nbcon_waiter_matches()
296 	 * - Lower priorities are ignored during panic() until reboot.  in nbcon_waiter_matches()
309 	 * Event #2 implies the new context is PANIC.  in nbcon_waiter_matches()
310 	 * Event #3 occurs when panic() has flushed the console.  in nbcon_waiter_matches()
311 	 * Event #4 occurs when a non-panic CPU reacquires.  in nbcon_waiter_matches()
334  *	-EPERM:		A panic is in progress and this is not the panic CPU
412  *	-EPERM:		A panic is in progress and this is not the panic CPU.
443 	 * Panic does not imply that the console is owned. However, it  in nbcon_context_try_acquire_handover()
444 	 * is critical that non-panic CPUs during panic are unable to  in nbcon_context_try_acquire_handover()
447 	 * lower priorities are ignored during panic.  in nbcon_context_try_acquire_handover()
538  * by the final attempt to flush messages in panic().
633 	 * EMERGENCY and PANIC priorities. However, this function must also  in nbcon_owner_matches()
1072 	 * unsafe section. This limits update races to the panic context and  in nbcon_emit_next_record()
1073 	 * allows the panic context to win.  in nbcon_emit_next_record()
1390  * preemption is disabled if the current CPU is in the emergency or panic
1570 	 * eventually skipped on panic CPU.  in nbcon_atomic_flush_pending_con()