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Diffstat (limited to 'arch/s390/kernel/topology.c')
-rw-r--r--arch/s390/kernel/topology.c31
1 files changed, 16 insertions, 15 deletions
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 5728c5bd44a8..bf05e7fc3e70 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -18,7 +18,10 @@
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/mm.h>
+#include <linux/nodemask.h>
+#include <linux/node.h>
#include <asm/sysinfo.h>
+#include <asm/numa.h>
#define PTF_HORIZONTAL (0UL)
#define PTF_VERTICAL (1UL)
@@ -37,8 +40,10 @@ static struct sysinfo_15_1_x *tl_info;
static int topology_enabled = 1;
static DECLARE_WORK(topology_work, topology_work_fn);
-/* topology_lock protects the socket and book linked lists */
-static DEFINE_SPINLOCK(topology_lock);
+/*
+ * Socket/Book linked lists and per_cpu(cpu_topology) updates are
+ * protected by "sched_domains_mutex".
+ */
static struct mask_info socket_info;
static struct mask_info book_info;
@@ -188,7 +193,6 @@ static void tl_to_masks(struct sysinfo_15_1_x *info)
{
struct cpuid cpu_id;
- spin_lock_irq(&topology_lock);
get_cpu_id(&cpu_id);
clear_masks();
switch (cpu_id.machine) {
@@ -199,7 +203,6 @@ static void tl_to_masks(struct sysinfo_15_1_x *info)
default:
__tl_to_masks_generic(info);
}
- spin_unlock_irq(&topology_lock);
}
static void topology_update_polarization_simple(void)
@@ -244,10 +247,8 @@ int topology_set_cpu_management(int fc)
static void update_cpu_masks(void)
{
- unsigned long flags;
int cpu;
- spin_lock_irqsave(&topology_lock, flags);
for_each_possible_cpu(cpu) {
per_cpu(cpu_topology, cpu).thread_mask = cpu_thread_map(cpu);
per_cpu(cpu_topology, cpu).core_mask = cpu_group_map(&socket_info, cpu);
@@ -259,7 +260,7 @@ static void update_cpu_masks(void)
per_cpu(cpu_topology, cpu).book_id = cpu;
}
}
- spin_unlock_irqrestore(&topology_lock, flags);
+ numa_update_cpu_topology();
}
void store_topology(struct sysinfo_15_1_x *info)
@@ -274,21 +275,21 @@ int arch_update_cpu_topology(void)
{
struct sysinfo_15_1_x *info = tl_info;
struct device *dev;
- int cpu;
+ int cpu, rc = 0;
- if (!MACHINE_HAS_TOPOLOGY) {
- update_cpu_masks();
- topology_update_polarization_simple();
- return 0;
+ if (MACHINE_HAS_TOPOLOGY) {
+ rc = 1;
+ store_topology(info);
+ tl_to_masks(info);
}
- store_topology(info);
- tl_to_masks(info);
update_cpu_masks();
+ if (!MACHINE_HAS_TOPOLOGY)
+ topology_update_polarization_simple();
for_each_online_cpu(cpu) {
dev = get_cpu_device(cpu);
kobject_uevent(&dev->kobj, KOBJ_CHANGE);
}
- return 1;
+ return rc;
}
static void topology_work_fn(struct work_struct *work)