- Add the global 'rebooting' variable that is used to detect when

boot() has been called.

Sponsored by:	Isilon Systems, Inc.
MFC After:	1 week

sys/kern/kern_shutdown.c

@@ -111,6 +111,7 @@ SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
 const char *panicstr;
 
 int dumping;				/* system is dumping */
+int rebooting;				/* system is rebooting */
 static struct dumperinfo dumper;	/* our selected dumper */
 
 /* Context information for dump-debuggers. */
@@ -265,6 +266,8 @@ boot(int howto)
 	mtx_unlock_spin(&sched_lock);
 	KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
 #endif
+	/* We're in the process of rebooting. */
+	rebooting = 1;
 
 	/* collect extra flags that shutdown_nice might have set */
 	howto |= shutdown_howto;

sys/sys/systm.h

@@ -49,6 +49,7 @@ extern int securelevel;		/* system security level (see init(8)) */
 extern int suser_enabled;	/* suser() is permitted to return 0 */
 
 extern int cold;		/* nonzero if we are doing a cold boot */
+extern int rebooting;		/* boot() has been called. */
 extern const char *panicstr;	/* panic message */
 extern char version[];		/* system version */
 extern char copyright[];	/* system copyright */