[PATCH] isolcpus option fix

The isolcpus option is broken in 2.6.10-rc2-bk2.  The domains are no longer
being properly initialized (which results in a panic at bootup).
Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ia64/kernel/domain.c

@@ -221,6 +221,23 @@ void __devinit arch_init_sched_domains(void)
 						&cpu_to_phys_group);
 	}
 
+	/* Initialize isolated CPU (physical) domains and groups */
+	for_each_cpu_mask(i, cpu_isolated_map) {
+		struct sched_domain *sd;
+		int group;
+
+		sd = &per_cpu(phys_domains, i);
+		group = cpu_to_phys_group(i);
+		*sd = SD_CPU_INIT;
+		cpu_set(i, sd->span);
+		sd->flags = 0;
+		sd->balance_interval = INT_MAX;
+		sd->groups = &sched_group_phys[group];
+		init_sched_build_groups(sched_group_phys, sd->span,
+						&cpu_to_phys_group);
+		sd->groups->cpu_power = SCHED_LOAD_SCALE;
+	}
+
 #ifdef CONFIG_NUMA
 	init_sched_build_groups(sched_group_allnodes, cpu_default_map,
 				&cpu_to_allnodes_group);

kernel/sched.c

@@ -4361,6 +4361,23 @@ static void __devinit arch_init_sched_domains(void)
 						&cpu_to_phys_group);
 	}
 
+        /* Initialize isolated CPU (physical) domains and groups */
+	for_each_cpu_mask(i, cpu_isolated_map) {
+		struct sched_domain *sd;
+		int group;
+
+		sd = &per_cpu(phys_domains, i);
+		group = cpu_to_phys_group(i);
+		*sd = SD_CPU_INIT;
+		cpu_set(i, sd->span);
+		sd->flags = 0;
+		sd->balance_interval = INT_MAX;
+		sd->groups = &sched_group_phys[group];
+		init_sched_build_groups(sched_group_phys, sd->span,
+						&cpu_to_phys_group);
+		sd->groups->cpu_power = SCHED_LOAD_SCALE;
+	}
+
 #ifdef CONFIG_NUMA
 	/* Set up node groups */
 	init_sched_build_groups(sched_group_nodes, cpu_default_map,