From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Tue, 9 Dec 2008 17:49:50 +0000 (+0100)
Subject: sched: let arch_update_cpu_topology indicate if topology changed
X-Git-Tag: Ubuntu-5.13.0-19.19~38350^2~8
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=ee79d1bdb6a10499e53f80b1e8d14110215178ba;p=mirror_ubuntu-jammy-kernel.git

sched: let arch_update_cpu_topology indicate if topology changed

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.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index a947899dcba1..bf96f1b5c6ec 100644
--- a/arch/s390/kernel/topology.c
+++ b/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)
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 117f1b7405cf..0c5b5ac36d8e 100644
--- a/include/linux/topology.h
+++ b/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
diff --git a/kernel/sched.c b/kernel/sched.c
index ef212da928e8..fcfbbd9dbd60 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7675,8 +7675,14 @@ static struct sched_domain_attr *dattr_cur;
  */
 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;
 }
 
 /*