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-rw-r--r--arch/s390/include/asm/topology.h2
-rw-r--r--arch/s390/kernel/smp.c2
-rw-r--r--arch/s390/kernel/topology.c34
3 files changed, 30 insertions, 8 deletions
diff --git a/arch/s390/include/asm/topology.h b/arch/s390/include/asm/topology.h
index 7016dd7b6bc4..0837de80c351 100644
--- a/arch/s390/include/asm/topology.h
+++ b/arch/s390/include/asm/topology.h
@@ -35,11 +35,13 @@ int topology_cpu_init(struct cpu *);
35int topology_set_cpu_management(int fc); 35int topology_set_cpu_management(int fc);
36void topology_schedule_update(void); 36void topology_schedule_update(void);
37void store_topology(struct sysinfo_15_1_x *info); 37void store_topology(struct sysinfo_15_1_x *info);
38void topology_expect_change(void);
38 39
39#else /* CONFIG_SCHED_BOOK */ 40#else /* CONFIG_SCHED_BOOK */
40 41
41static inline void topology_schedule_update(void) { } 42static inline void topology_schedule_update(void) { }
42static inline int topology_cpu_init(struct cpu *cpu) { return 0; } 43static inline int topology_cpu_init(struct cpu *cpu) { return 0; }
44static inline void topology_expect_change(void) { }
43 45
44#endif /* CONFIG_SCHED_BOOK */ 46#endif /* CONFIG_SCHED_BOOK */
45 47
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 109e7422bb20..8aba77df68a9 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -867,6 +867,7 @@ static ssize_t cpu_configure_store(struct sys_device *dev,
867 if (!rc) { 867 if (!rc) {
868 smp_cpu_state[cpu] = CPU_STATE_STANDBY; 868 smp_cpu_state[cpu] = CPU_STATE_STANDBY;
869 cpu_set_polarization(cpu, POLARIZATION_UNKNOWN); 869 cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
870 topology_expect_change();
870 } 871 }
871 } 872 }
872 break; 873 break;
@@ -876,6 +877,7 @@ static ssize_t cpu_configure_store(struct sys_device *dev,
876 if (!rc) { 877 if (!rc) {
877 smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; 878 smp_cpu_state[cpu] = CPU_STATE_CONFIGURED;
878 cpu_set_polarization(cpu, POLARIZATION_UNKNOWN); 879 cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
880 topology_expect_change();
879 } 881 }
880 } 882 }
881 break; 883 break;
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 2abad3014928..e06fb852d386 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -31,7 +31,6 @@ struct mask_info {
31static int topology_enabled = 1; 31static int topology_enabled = 1;
32static void topology_work_fn(struct work_struct *work); 32static void topology_work_fn(struct work_struct *work);
33static struct sysinfo_15_1_x *tl_info; 33static struct sysinfo_15_1_x *tl_info;
34static struct timer_list topology_timer;
35static void set_topology_timer(void); 34static void set_topology_timer(void);
36static DECLARE_WORK(topology_work, topology_work_fn); 35static DECLARE_WORK(topology_work, topology_work_fn);
37/* topology_lock protects the core linked list */ 36/* topology_lock protects the core linked list */
@@ -297,12 +296,30 @@ static void topology_timer_fn(unsigned long ignored)
297 set_topology_timer(); 296 set_topology_timer();
298} 297}
299 298
299static struct timer_list topology_timer =
300 TIMER_DEFERRED_INITIALIZER(topology_timer_fn, 0, 0);
301
302static atomic_t topology_poll = ATOMIC_INIT(0);
303
300static void set_topology_timer(void) 304static void set_topology_timer(void)
301{ 305{
302 topology_timer.function = topology_timer_fn; 306 if (atomic_add_unless(&topology_poll, -1, 0))
303 topology_timer.data = 0; 307 mod_timer(&topology_timer, jiffies + HZ / 10);
304 topology_timer.expires = jiffies + 60 * HZ; 308 else
305 add_timer(&topology_timer); 309 mod_timer(&topology_timer, jiffies + HZ * 60);
310}
311
312void topology_expect_change(void)
313{
314 if (!MACHINE_HAS_TOPOLOGY)
315 return;
316 /* This is racy, but it doesn't matter since it is just a heuristic.
317 * Worst case is that we poll in a higher frequency for a bit longer.
318 */
319 if (atomic_read(&topology_poll) > 60)
320 return;
321 atomic_add(60, &topology_poll);
322 set_topology_timer();
306} 323}
307 324
308static int __init early_parse_topology(char *p) 325static int __init early_parse_topology(char *p)
@@ -379,8 +396,10 @@ static ssize_t dispatching_store(struct sysdev_class *dev,
379 if (cpu_management == val) 396 if (cpu_management == val)
380 goto out; 397 goto out;
381 rc = topology_set_cpu_management(val); 398 rc = topology_set_cpu_management(val);
382 if (!rc) 399 if (rc)
383 cpu_management = val; 400 goto out;
401 cpu_management = val;
402 topology_expect_change();
384out: 403out:
385 mutex_unlock(&smp_cpu_state_mutex); 404 mutex_unlock(&smp_cpu_state_mutex);
386 put_online_cpus(); 405 put_online_cpus();
@@ -438,7 +457,6 @@ static int __init topology_init(void)
438 topology_update_polarization_simple(); 457 topology_update_polarization_simple();
439 goto out; 458 goto out;
440 } 459 }
441 init_timer_deferrable(&topology_timer);
442 set_topology_timer(); 460 set_topology_timer();
443out: 461out:
444 update_cpu_core_map(); 462 update_cpu_core_map();