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Date: Mon, 14 Jul 2014 22:37:07 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM list <linux-pm@...r.kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] PM / sleep: Simplify sleep states sysfs interface code
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Simplify the sleep states sysfs interface /sys/power/state code by
redefining pm_states[] as an array of pointers to constant strings
such that only the entries corresponding to valid states are set.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
kernel/power/main.c | 21 +++++++++++----------
kernel/power/power.h | 7 +------
kernel/power/suspend.c | 34 ++++++++++++++--------------------
kernel/power/suspend_test.c | 12 ++++++------
4 files changed, 32 insertions(+), 42 deletions(-)
Index: linux-pm/kernel/power/power.h
===================================================================
--- linux-pm.orig/kernel/power/power.h
+++ linux-pm/kernel/power/power.h
@@ -178,13 +178,8 @@ extern void swsusp_show_speed(struct tim
unsigned int, char *);
#ifdef CONFIG_SUSPEND
-struct pm_sleep_state {
- const char *label;
- suspend_state_t state;
-};
-
/* kernel/power/suspend.c */
-extern struct pm_sleep_state pm_states[];
+extern const char *pm_states[];
extern int suspend_devices_and_enter(suspend_state_t state);
#else /* !CONFIG_SUSPEND */
Index: linux-pm/kernel/power/suspend.c
===================================================================
--- linux-pm.orig/kernel/power/suspend.c
+++ linux-pm/kernel/power/suspend.c
@@ -31,11 +31,8 @@
#include "power.h"
-struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = {
- [PM_SUSPEND_FREEZE] = { .label = "freeze", .state = PM_SUSPEND_FREEZE },
- [PM_SUSPEND_STANDBY] = { .label = "standby", },
- [PM_SUSPEND_MEM] = { .label = "mem", },
-};
+static const char *pm_labels[] = { "mem", "standby", "freeze", };
+const char *pm_states[PM_SUSPEND_MAX];
static const struct platform_suspend_ops *suspend_ops;
static const struct platform_freeze_ops *freeze_ops;
@@ -97,10 +94,7 @@ static bool relative_states;
static int __init sleep_states_setup(char *str)
{
relative_states = !strncmp(str, "1", 1);
- if (relative_states) {
- pm_states[PM_SUSPEND_MEM].state = PM_SUSPEND_FREEZE;
- pm_states[PM_SUSPEND_FREEZE].state = 0;
- }
+ pm_states[PM_SUSPEND_FREEZE] = pm_labels[relative_states ? 0 : 2];
return 1;
}
@@ -113,20 +107,20 @@ __setup("relative_sleep_states=", sleep_
void suspend_set_ops(const struct platform_suspend_ops *ops)
{
suspend_state_t i;
- int j = PM_SUSPEND_MAX - 1;
+ int j = 0;
lock_system_sleep();
suspend_ops = ops;
for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--)
- if (valid_state(i))
- pm_states[j--].state = i;
- else if (!relative_states)
- pm_states[j--].state = 0;
-
- pm_states[j--].state = PM_SUSPEND_FREEZE;
- while (j >= PM_SUSPEND_MIN)
- pm_states[j--].state = 0;
+ if (valid_state(i)) {
+ pm_states[i] = pm_labels[j++];
+ } else if (!relative_states) {
+ pm_states[i] = NULL;
+ j++;
+ }
+
+ pm_states[PM_SUSPEND_FREEZE] = pm_labels[j];
unlock_system_sleep();
}
@@ -395,7 +389,7 @@ static int enter_state(suspend_state_t s
printk("done.\n");
trace_suspend_resume(TPS("sync_filesystems"), 0, false);
- pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label);
+ pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
error = suspend_prepare(state);
if (error)
goto Unlock;
@@ -404,7 +398,7 @@ static int enter_state(suspend_state_t s
goto Finish;
trace_suspend_resume(TPS("suspend_enter"), state, false);
- pr_debug("PM: Entering %s sleep\n", pm_states[state].label);
+ pr_debug("PM: Entering %s sleep\n", pm_states[state]);
pm_restrict_gfp_mask();
error = suspend_devices_and_enter(state);
pm_restore_gfp_mask();
Index: linux-pm/kernel/power/main.c
===================================================================
--- linux-pm.orig/kernel/power/main.c
+++ linux-pm/kernel/power/main.c
@@ -296,8 +296,8 @@ static ssize_t state_show(struct kobject
suspend_state_t i;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
- if (pm_states[i].state)
- s += sprintf(s,"%s ", pm_states[i].label);
+ if (pm_states[i])
+ s += sprintf(s,"%s ", pm_states[i]);
#endif
if (hibernation_available())
@@ -311,8 +311,7 @@ static ssize_t state_show(struct kobject
static suspend_state_t decode_state(const char *buf, size_t n)
{
#ifdef CONFIG_SUSPEND
- suspend_state_t state = PM_SUSPEND_MIN;
- struct pm_sleep_state *s;
+ suspend_state_t state;
#endif
char *p;
int len;
@@ -325,10 +324,12 @@ static suspend_state_t decode_state(cons
return PM_SUSPEND_MAX;
#ifdef CONFIG_SUSPEND
- for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++)
- if (s->state && len == strlen(s->label)
- && !strncmp(buf, s->label, len))
- return s->state;
+ for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) {
+ const char *label = pm_states[state];
+
+ if (label && len == strlen(label) && !strncmp(buf, label, len))
+ return state;
+ }
#endif
return PM_SUSPEND_ON;
@@ -446,8 +447,8 @@ static ssize_t autosleep_show(struct kob
#ifdef CONFIG_SUSPEND
if (state < PM_SUSPEND_MAX)
- return sprintf(buf, "%s\n", pm_states[state].state ?
- pm_states[state].label : "error");
+ return sprintf(buf, "%s\n", pm_states[state] ?
+ pm_states[state] : "error");
#endif
#ifdef CONFIG_HIBERNATION
return sprintf(buf, "disk\n");
Index: linux-pm/kernel/power/suspend_test.c
===================================================================
--- linux-pm.orig/kernel/power/suspend_test.c
+++ linux-pm/kernel/power/suspend_test.c
@@ -92,13 +92,13 @@ static void __init test_wakealarm(struct
}
if (state == PM_SUSPEND_MEM) {
- printk(info_test, pm_states[state].label);
+ printk(info_test, pm_states[state]);
status = pm_suspend(state);
if (status == -ENODEV)
state = PM_SUSPEND_STANDBY;
}
if (state == PM_SUSPEND_STANDBY) {
- printk(info_test, pm_states[state].label);
+ printk(info_test, pm_states[state]);
status = pm_suspend(state);
}
if (status < 0)
@@ -141,8 +141,8 @@ static int __init setup_test_suspend(cha
/* "=mem" ==> "mem" */
value++;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
- if (!strcmp(pm_states[i].label, value)) {
- test_state = pm_states[i].state;
+ if (!strcmp(pm_states[i], value)) {
+ test_state = i;
return 0;
}
@@ -162,8 +162,8 @@ static int __init test_suspend(void)
/* PM is initialized by now; is that state testable? */
if (test_state == PM_SUSPEND_ON)
goto done;
- if (!pm_states[test_state].state) {
- printk(warn_bad_state, pm_states[test_state].label);
+ if (!pm_states[test_state]) {
+ printk(warn_bad_state, pm_states[test_state]);
goto done;
}
--
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