linux-kernel - [PATCH 2/2][v3] PM / s2idle: Code cleanup to make s2idle consistent with normal idle path

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Date:   Tue, 23 Jun 2020 14:31:52 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chen Yu <yu.c.chen@...el.com>,
        Len Brown <lenb@...nel.org>
Subject: [PATCH 2/2][v3] PM / s2idle: Code cleanup to make s2idle consistent with normal idle path

Currently s2idle is a little different from the normal idle path. This
patch makes call_s2idle() consistent with call_cpuidle(), and also
s2idle_enter() is analogous to cpuidle_enter().

No functional change.

Suggested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Len Brown <lenb@...nel.org>
Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Chen Yu <yu.c.chen@...el.com>
---
 drivers/cpuidle/cpuidle.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index e092789187c6..b2e764d1ac99 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -134,8 +134,8 @@ int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
 }
 
 #ifdef CONFIG_SUSPEND
-static void enter_s2idle_proper(struct cpuidle_driver *drv,
-				struct cpuidle_device *dev, int index)
+static void s2idle_enter(struct cpuidle_driver *drv,
+			 struct cpuidle_device *dev, int index)
 {
 	ktime_t time_start, time_end;
 
@@ -169,6 +169,15 @@ static void enter_s2idle_proper(struct cpuidle_driver *drv,
 	dev->states_usage[index].s2idle_usage++;
 }
 
+static int call_s2idle(struct cpuidle_driver *drv,
+		       struct cpuidle_device *dev, int index)
+{
+	if (!current_clr_polling_and_test())
+		s2idle_enter(drv, dev, index);
+
+	return index;
+}
+
 /**
  * cpuidle_enter_s2idle - Enter an idle state suitable for suspend-to-idle.
  * @drv: cpuidle driver for the given CPU.
@@ -187,8 +196,8 @@ int cpuidle_enter_s2idle(struct cpuidle_driver *drv, struct cpuidle_device *dev)
 	 * be frozen safely.
 	 */
 	index = find_deepest_state(drv, dev, U64_MAX, 0, true);
-	if (index > 0 && !current_clr_polling_and_test())
-		enter_s2idle_proper(drv, dev, index);
+	if (index > 0)
+		call_s2idle(drv, dev, index);
 
 	return index;
 }
-- 
2.17.1