linux-kernel - [PATCH v1 05/12] PM: sleep: stats: Use step_failures[0] as a counter of successful cycles

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Date: Mon, 22 Jan 2024 12:29:11 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>, Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
Subject: [PATCH v1 05/12] PM: sleep: stats: Use step_failures[0] as a counter of successful cycles

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The first (index 0) cell of the step_failures[] array in struct
suspend_stats introduced previously can be used as a counter of
successful suspend-resume cycles instead of the separate "success"
field in it, so do that.

While at it, change the type of the "fail" field in struct
suspend_stats to unsigned int, because it cannot be negative.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/linux/suspend.h |    3 +--
 kernel/power/main.c     |    9 +++++----
 kernel/power/suspend.c  |    2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

Index: linux-pm/include/linux/suspend.h
===================================================================
--- linux-pm.orig/include/linux/suspend.h
+++ linux-pm/include/linux/suspend.h
@@ -55,8 +55,7 @@ enum suspend_stat_step {
 
 struct suspend_stats {
 	unsigned int step_failures[SUSPEND_NR_STEPS];
-	int	success;
-	int	fail;
+	unsigned int fail;
 #define	REC_FAILED_NUM	2
 	int	last_failed_dev;
 	char	failed_devs[REC_FAILED_NUM][40];
Index: linux-pm/kernel/power/main.c
===================================================================
--- linux-pm.orig/kernel/power/main.c
+++ linux-pm/kernel/power/main.c
@@ -339,8 +339,7 @@ static ssize_t _name##_show(struct kobje
 }								\
 static struct kobj_attribute _name = __ATTR_RO(_name)
 
-suspend_attr(success, "%d\n");
-suspend_attr(fail, "%d\n");
+suspend_attr(fail, "%u\n");
 suspend_attr(last_hw_sleep, "%llu\n");
 suspend_attr(total_hw_sleep, "%llu\n");
 suspend_attr(max_hw_sleep, "%llu\n");
@@ -354,6 +353,7 @@ static ssize_t _name##_show(struct kobje
 }								\
 static struct kobj_attribute _name = __ATTR_RO(_name)
 
+suspend_step_attr(success, SUSPEND_NONE);
 suspend_step_attr(failed_freeze, SUSPEND_FREEZE);
 suspend_step_attr(failed_prepare, SUSPEND_PREPARE);
 suspend_step_attr(failed_suspend, SUSPEND_SUSPEND);
@@ -458,8 +458,9 @@ static int suspend_stats_show(struct seq
 	last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
 	last_step %= REC_FAILED_NUM;
 
-	seq_printf(s, "success: %d\nfail: %d\n",
-		   suspend_stats.success, suspend_stats.fail);
+	seq_printf(s, "success: %u\nfail: %u\n",
+		   suspend_stats.step_failures[SUSPEND_NONE],
+		   suspend_stats.fail);
 
 	for (step = SUSPEND_FREEZE; step < SUSPEND_NR_STEPS; step++)
 		seq_printf(s, "failed_%s: %u\n", suspend_step_names[step],
Index: linux-pm/kernel/power/suspend.c
===================================================================
--- linux-pm.orig/kernel/power/suspend.c
+++ linux-pm/kernel/power/suspend.c
@@ -620,7 +620,7 @@ int pm_suspend(suspend_state_t state)
 		suspend_stats.fail++;
 		dpm_save_failed_errno(error);
 	} else {
-		suspend_stats.success++;
+		suspend_stats.step_failures[SUSPEND_NONE]++;
 	}
 	pr_info("suspend exit\n");
 	return error;