[patch] [sched] set_cpus_allowed() fix, 2.5.3-pre5

[Ingo Molnar]

the attached patch fixes set_cpus_allowed() to set p->state *before*
sending the migration IPI. This is a rare codepath used during bootup
only, so the race was never seen in action. The bug was noticed by Robert
Love.

	Ingo

--- linux/kernel/sched.c.orig	Fri Jan 25 10:44:18 2002
+++ linux/kernel/sched.c	Fri Jan 25 12:06:36 2002
@@ -803,9 +837,9 @@
 	if (new_mask & (1UL << smp_processor_id()))
 		return;
 #if CONFIG_SMP
+	current->state = TASK_UNINTERRUPTIBLE;
 	smp_migrate_task(ffz(~new_mask), current);

-	current->state = TASK_UNINTERRUPTIBLE;
 	schedule();
 #endif
 }