diff -Naurp linux-2.6.12-rc2.orig/kernel/cpuset.c linux-2.6.12-rc2/kernel/cpuset.c
--- linux-2.6.12-rc2.orig/kernel/cpuset.c	2005-04-28 18:24:11.000000000 +0530
+++ linux-2.6.12-rc2/kernel/cpuset.c	2005-05-01 22:15:06.000000000 +0530
@@ -602,12 +602,48 @@ static int validate_change(const struct 
 	return 0;
 }
 
+static void update_cpu_domains(struct cpuset *cur)
+{
+	struct cpuset *c, *par = cur->parent;
+	cpumask_t span1, span2;
+
+	if (par == NULL || cpus_empty(cur->cpus_allowed))
+		return;
+
+	/* Get all non-exclusive cpus from parent domain */
+	span1 = par->cpus_allowed;
+	list_for_each_entry(c, &par->children, sibling) {
+		if (is_cpu_exclusive(c))
+			cpus_andnot(span1, span1, c->cpus_allowed);
+	}
+	if (is_removed(cur) || !is_cpu_exclusive(cur)) {
+		cpus_or(span1, span1, cur->cpus_allowed);
+		if (cpus_equal(span1, cur->cpus_allowed))
+			return;
+		span2 = CPU_MASK_NONE;
+	}
+	else {
+		if (cpus_empty(span1))
+			return;
+		span2 = cur->cpus_allowed;
+		/* If current cpuset has exclusive children, exclude from domain */
+		list_for_each_entry(c, &cur->children, sibling) {
+			if (is_cpu_exclusive(c))
+				cpus_andnot(span2, span2, c->cpus_allowed);
+		}
+	}
+
+	lock_cpu_hotplug();
+	rebuild_sched_domains(span1, span2);
+	unlock_cpu_hotplug();
+}
+
 static int update_cpumask(struct cpuset *cs, char *buf)
 {
-	struct cpuset trialcs;
+	struct cpuset trialcs, oldcs;
 	int retval;
 
-	trialcs = *cs;
+	trialcs = oldcs = *cs;
 	retval = cpulist_parse(buf, trialcs.cpus_allowed);
 	if (retval < 0)
 		return retval;
@@ -615,9 +651,13 @@ static int update_cpumask(struct cpuset 
 	if (cpus_empty(trialcs.cpus_allowed))
 		return -ENOSPC;
 	retval = validate_change(cs, &trialcs);
-	if (retval == 0)
-		cs->cpus_allowed = trialcs.cpus_allowed;
-	return retval;
+	if (retval < 0)
+		return retval;
+	cs->cpus_allowed = trialcs.cpus_allowed;
+	if (is_cpu_exclusive(cs) && 
+	    (!cpus_equal(cs->cpus_allowed, oldcs.cpus_allowed)))
+		update_cpu_domains(cs);
+	return 0;
 }
 
 static int update_nodemask(struct cpuset *cs, char *buf)
@@ -652,25 +692,28 @@ static int update_nodemask(struct cpuset
 static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs, char *buf)
 {
 	int turning_on;
-	struct cpuset trialcs;
+	struct cpuset trialcs, oldcs;
 	int err;
 
 	turning_on = (simple_strtoul(buf, NULL, 10) != 0);
 
-	trialcs = *cs;
+	trialcs = oldcs = *cs;
 	if (turning_on)
 		set_bit(bit, &trialcs.flags);
 	else
 		clear_bit(bit, &trialcs.flags);
 
 	err = validate_change(cs, &trialcs);
-	if (err == 0) {
-		if (turning_on)
-			set_bit(bit, &cs->flags);
-		else
-			clear_bit(bit, &cs->flags);
-	}
-	return err;
+	if (err < 0)
+		return err;
+	if (turning_on)
+		set_bit(bit, &cs->flags);
+	else
+		clear_bit(bit, &cs->flags);
+
+	if (is_cpu_exclusive(cs) != is_cpu_exclusive(&oldcs))
+                update_cpu_domains(cs);
+	return 0;
 }
 
 static int attach_task(struct cpuset *cs, char *buf)
@@ -1319,6 +1362,8 @@ static int cpuset_rmdir(struct inode *un
 	spin_lock(&cs->dentry->d_lock);
 	parent = cs->parent;
 	set_bit(CS_REMOVED, &cs->flags);
+	if (is_cpu_exclusive(cs))
+		update_cpu_domains(cs);
 	list_del(&cs->sibling);	/* delete my sibling from parent->children */
 	if (list_empty(&parent->children))
 		check_for_release(parent);