From 22e52b072dd87faa9b2559fe89d4e8f2370f81ca Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 12 Mar 2008 18:31:59 +0100
Subject: [PATCH] sched: add arch_update_cpu_topology hook.
Will be called each time the scheduling domains are rebuild.
Needed for architectures that don't have a static cpu topology.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
include/linux/topology.h | 2 ++
kernel/sched.c | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 2d8dac8799cf3..bd14f8b30f099 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -50,6 +50,8 @@
for_each_online_node(node) \
if (nr_cpus_node(node))
+void arch_update_cpu_topology(void);
+
/* Conform to ACPI 2.0 SLIT distance definitions */
#define LOCAL_DISTANCE 10
#define REMOTE_DISTANCE 20
diff --git a/kernel/sched.c b/kernel/sched.c
index 78482e51b5835..28c73f07efb2f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6807,6 +6807,10 @@ static int ndoms_cur; /* number of sched domains in 'doms_cur' */
*/
static cpumask_t fallback_doms;
+void __attribute__((weak)) arch_update_cpu_topology(void)
+{
+}
+
/*
* Set up scheduler domains and groups. Callers must hold the hotplug lock.
* For now this just excludes isolated cpus, but could be used to
@@ -6816,6 +6820,7 @@ static int arch_init_sched_domains(const cpumask_t *cpu_map)
{
int err;
+ arch_update_cpu_topology();
ndoms_cur = 1;
doms_cur = kmalloc(sizeof(cpumask_t), GFP_KERNEL);
if (!doms_cur)
--
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