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Diffstat (limited to 'arch/s390/kernel/smp.c')
-rw-r--r--arch/s390/kernel/smp.c44
1 files changed, 28 insertions, 16 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index dc4a534..a7125b6 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -59,7 +59,7 @@ enum {
};
struct pcpu {
- struct cpu cpu;
+ struct cpu *cpu;
struct _lowcore *lowcore; /* lowcore page(s) for the cpu */
unsigned long async_stack; /* async stack for the cpu */
unsigned long panic_stack; /* panic stack for the cpu */
@@ -159,9 +159,9 @@ static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit)
{
int order;
- set_bit(ec_bit, &pcpu->ec_mask);
- order = pcpu_running(pcpu) ?
- SIGP_EXTERNAL_CALL : SIGP_EMERGENCY_SIGNAL;
+ if (test_and_set_bit(ec_bit, &pcpu->ec_mask))
+ return;
+ order = pcpu_running(pcpu) ? SIGP_EXTERNAL_CALL : SIGP_EMERGENCY_SIGNAL;
pcpu_sigp_retry(pcpu, order, 0);
}
@@ -721,18 +721,14 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
return 0;
}
-static int __init setup_possible_cpus(char *s)
-{
- int max, cpu;
+static unsigned int setup_possible_cpus __initdata;
- if (kstrtoint(s, 0, &max) < 0)
- return 0;
- init_cpu_possible(cpumask_of(0));
- for (cpu = 1; cpu < max && cpu < nr_cpu_ids; cpu++)
- set_cpu_possible(cpu, true);
+static int __init _setup_possible_cpus(char *s)
+{
+ get_option(&s, &setup_possible_cpus);
return 0;
}
-early_param("possible_cpus", setup_possible_cpus);
+early_param("possible_cpus", _setup_possible_cpus);
#ifdef CONFIG_HOTPLUG_CPU
@@ -775,6 +771,17 @@ void __noreturn cpu_die(void)
#endif /* CONFIG_HOTPLUG_CPU */
+void __init smp_fill_possible_mask(void)
+{
+ unsigned int possible, cpu;
+
+ possible = setup_possible_cpus;
+ if (!possible)
+ possible = MACHINE_IS_VM ? 64 : nr_cpu_ids;
+ for (cpu = 0; cpu < possible && cpu < nr_cpu_ids; cpu++)
+ set_cpu_possible(cpu, true);
+}
+
void __init smp_prepare_cpus(unsigned int max_cpus)
{
/* request the 0x1201 emergency signal external interrupt */
@@ -958,7 +965,7 @@ static int smp_cpu_notify(struct notifier_block *self, unsigned long action,
void *hcpu)
{
unsigned int cpu = (unsigned int)(long)hcpu;
- struct cpu *c = &pcpu_devices[cpu].cpu;
+ struct cpu *c = pcpu_devices[cpu].cpu;
struct device *s = &c->dev;
int err = 0;
@@ -975,10 +982,15 @@ static int smp_cpu_notify(struct notifier_block *self, unsigned long action,
static int smp_add_present_cpu(int cpu)
{
- struct cpu *c = &pcpu_devices[cpu].cpu;
- struct device *s = &c->dev;
+ struct device *s;
+ struct cpu *c;
int rc;
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c)
+ return -ENOMEM;
+ pcpu_devices[cpu].cpu = c;
+ s = &c->dev;
c->hotpluggable = 1;
rc = register_cpu(c, cpu);
if (rc)

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