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DateMon, 15 Dec 2008 15:34:38 +0100
FromHeiko Carstens <>
Subject[PATCH/RESEND 1/2] sched: let arch_update_cpu_topology indicate if topology changed
From: Heiko Carstens <heiko.carstens@de.ibm.com>

Change arch_update_cpu_topology so it returns 1 if the cpu topology changed
and 0 if it didn't change. This will be useful for the next patch which adds
a call to this function in partition_sched_domains.

Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
arch/s390/kernel/topology.c | 5 +++--
include/linux/topology.h | 2 +-
kernel/sched.c | 8 +++++++-
3 files changed, 11 insertions(+), 4 deletions(-)
Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -7712,8 +7712,14 @@ static struct sched_domain_attr *dattr_c
*/
static cpumask_t fallback_doms;

-void __attribute__((weak)) arch_update_cpu_topology(void)
+/*
+ * arch_update_cpu_topology lets virtualized architectures update the
+ * cpu core maps. It is supposed to return 1 if the topology changed
+ * or 0 if it stayed the same.
+ */
+int __attribute__((weak)) arch_update_cpu_topology(void)
{
+ return 0;
}

/*
Index: linux-2.6/arch/s390/kernel/topology.c
===================================================================
--- linux-2.6.orig/arch/s390/kernel/topology.c
+++ linux-2.6/arch/s390/kernel/topology.c
@@ -212,7 +212,7 @@ static void update_cpu_core_map(void)
cpu_core_map[cpu] = cpu_coregroup_map(cpu);
}

-void arch_update_cpu_topology(void)
+int arch_update_cpu_topology(void)
{
struct tl_info *info = tl_info;
struct sys_device *sysdev;
@@ -221,7 +221,7 @@ void arch_update_cpu_topology(void)
if (!machine_has_topology) {
update_cpu_core_map();
topology_update_polarization_simple();
- return;
+ return 0;
}
stsi(info, 15, 1, 2);
tl_to_cores(info);
@@ -230,6 +230,7 @@ void arch_update_cpu_topology(void)
sysdev = get_cpu_sysdev(cpu);
kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
}
+ return 1;
}

static void topology_work_fn(struct work_struct *work)
Index: linux-2.6/include/linux/topology.h
===================================================================
--- linux-2.6.orig/include/linux/topology.h
+++ linux-2.6/include/linux/topology.h
@@ -49,7 +49,7 @@
for_each_online_node(node) \
if (nr_cpus_node(node))

-void arch_update_cpu_topology(void);
+int arch_update_cpu_topology(void);

/* Conform to ACPI 2.0 SLIT distance definitions */
#define LOCAL_DISTANCE 10
--


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