This patch is mortly art's work and was done *a year* ago. Art wants to thank

everyone for the prompt review and ok of this work ;-)  Yeah, that includes me
too, or maybe especially me.  I am sorry.

Change the sched_lock to a mutex. This fixes, among other things, the infamous
"telnet localhost &" problem.  The real bug in that case was that the sched_lock
which is by design a non-recursive lock, was recursively acquired, and not
enough releases made us hold the lock in the idle loop, blocking scheduling
on the other processors.  Some of the other processors would hold the biglock though,
which made it impossible for cpu 0 to enter the kernel...  A nice deadlock.
Let me just say debugging this for days just to realize that it was all fixed
in an old diff noone ever ok'd was somewhat of an anti-climax.

This diff also changes splsched to be correct for all our architectures.

1 files changed, 3 insertions, 14 deletions

diff --git a/sys/arch/mips64/mips64/interrupt.c b/sys/arch/mips64/mips64/interrupt.c
index 391c6ea26ce..95ea6c0ef8f 100644
--- a/sys/arch/mips64/mips64/interrupt.c
+++ b/sys/arch/mips64/mips64/interrupt.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: interrupt.c,v 1.11 2005/01/31 21:35:50 grange Exp $ */
+/*	$OpenBSD: interrupt.c,v 1.12 2005/05/25 23:17:47 niklas Exp $ */
 
 /*
  * Copyright (c) 2001-2004 Opsycon AB  (www.opsycon.se / www.opsycon.com)
@@ -282,21 +282,10 @@ softintr()
 		ADDUPROF(p);
 	}
 	if (want_resched) {
-		int s;
-
 		/*
-		 * Since we are curproc, clock will normally just change
-		 * our priority without moving us from one queue to another
-		 * (since the running process is not on a queue.)
-		 * If that happened after we put ourselves on the run queue
-		 * but before we switched, we might not be on the queue
-		 * indicated by our priority.
+		 * We're being preempted.
 		 */
-		s = splstatclock();
-		setrunqueue(p);
-		p->p_stats->p_ru.ru_nivcsw++;
-		mi_switch();
-		splx(s);
+		preempt(NULL);
 		while ((sig = CURSIG(p)) != 0)
 			postsig(sig);
 	}