aboutsummaryrefslogtreecommitdiff
path: root/kernel/power/main.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/power/main.c')
-rw-r--r--kernel/power/main.c40
1 files changed, 34 insertions, 6 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 6d295c77679..873228c71da 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -16,6 +16,8 @@
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/console.h>
+#include <linux/cpu.h>
+#include <linux/resume-trace.h>
#include "power.h"
@@ -51,7 +53,7 @@ void pm_set_ops(struct pm_ops * ops)
static int suspend_prepare(suspend_state_t state)
{
- int error = 0;
+ int error;
unsigned int free_pages;
if (!pm_ops || !pm_ops->enter)
@@ -59,12 +61,9 @@ static int suspend_prepare(suspend_state_t state)
pm_prepare_console();
- disable_nonboot_cpus();
-
- if (num_online_cpus() != 1) {
- error = -EPERM;
+ error = disable_nonboot_cpus();
+ if (error)
goto Enable_cpu;
- }
if (freeze_processes()) {
error = -EAGAIN;
@@ -283,10 +282,39 @@ static ssize_t state_store(struct subsystem * subsys, const char * buf, size_t n
power_attr(state);
+#ifdef CONFIG_PM_TRACE
+int pm_trace_enabled;
+
+static ssize_t pm_trace_show(struct subsystem * subsys, char * buf)
+{
+ return sprintf(buf, "%d\n", pm_trace_enabled);
+}
+
+static ssize_t
+pm_trace_store(struct subsystem * subsys, const char * buf, size_t n)
+{
+ int val;
+
+ if (sscanf(buf, "%d", &val) == 1) {
+ pm_trace_enabled = !!val;
+ return n;
+ }
+ return -EINVAL;
+}
+
+power_attr(pm_trace);
+
+static struct attribute * g[] = {
+ &state_attr.attr,
+ &pm_trace_attr.attr,
+ NULL,
+};
+#else
static struct attribute * g[] = {
&state_attr.attr,
NULL,
};
+#endif /* CONFIG_PM_TRACE */
static struct attribute_group attr_group = {
.attrs = g,