[patch 04/10] sched: Add arch_update_cpu_topology hook.

Martin Schwidefsky
2008-03-12T17:33:38Z

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From: Heiko Carstens <heiko.carstens@de.ibm.com>

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>
---

include/linux/topology.h | 2 ++
kernel/sched.c | 5 +++++
2 files changed, 7 insertions(+)

Index: quilt-2.6/include/linux/topology.h
===================================================================
--- quilt-2.6.orig/include/linux/topology.h
+++ quilt-2.6/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
Index: quilt-2.6/kernel/sched.c
===================================================================
--- quilt-2.6.orig/kernel/sched.c
+++ quilt-2.6/kernel/sched.c
@@ -6804,6 +6804,10 @@ static int ndoms_cur; /* number of sche
*/
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
@@ -6813,6 +6817,7 @@ static int arch_init_sched_domains(const
{
int err;

+ arch_update_cpu_topology();
ndoms_cur = 1;
doms_cur = kmalloc(sizeof(cpumask_t), GFP_KERNEL);
if (!doms_cur)

--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.