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Diffstat (limited to 'arch/s390/kernel/processor.c')
-rw-r--r--arch/s390/kernel/processor.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/s390/kernel/processor.c b/arch/s390/kernel/processor.c
index 647128d5b983..de7451065c34 100644
--- a/arch/s390/kernel/processor.c
+++ b/arch/s390/kernel/processor.c
@@ -6,6 +6,7 @@
#define KMSG_COMPONENT "cpu"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+#include <linux/cpufeature.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/seq_file.h>
@@ -84,7 +85,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
seq_puts(m, "\n");
show_cacheinfo(m);
}
- get_online_cpus();
if (cpu_online(n)) {
struct cpuid *id = &per_cpu(cpu_id, n);
seq_printf(m, "processor %li: "
@@ -93,23 +93,31 @@ static int show_cpuinfo(struct seq_file *m, void *v)
"machine = %04X\n",
n, id->version, id->ident, id->machine);
}
- put_online_cpus();
return 0;
}
+static inline void *c_update(loff_t *pos)
+{
+ if (*pos)
+ *pos = cpumask_next(*pos - 1, cpu_online_mask);
+ return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
+}
+
static void *c_start(struct seq_file *m, loff_t *pos)
{
- return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
+ get_online_cpus();
+ return c_update(pos);
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
- return c_start(m, pos);
+ return c_update(pos);
}
static void c_stop(struct seq_file *m, void *v)
{
+ put_online_cpus();
}
const struct seq_operations cpuinfo_op = {