linux-kernel - [PATCH] cpuidle: menu: Update stale polling override comment

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Message-ID: <2037635.8RjXc8lXCc@aspire.rjw.lan>
Date:   Thu, 16 Aug 2018 12:55:01 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: [PATCH] cpuidle: menu: Update stale polling override comment

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

The comment to explain why the menu governor uses idle state 1
instead of idle state 0 as the first one sometimes is stale (among
other things it mentions a user setting not present any more),
so update it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/cpuidle/governors/menu.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

Index: linux-pm/drivers/cpuidle/governors/menu.c
===================================================================
--- linux-pm.orig/drivers/cpuidle/governors/menu.c
+++ linux-pm/drivers/cpuidle/governors/menu.c
@@ -328,9 +328,8 @@ static int menu_select(struct cpuidle_dr
 		unsigned int polling_threshold;
 
 		/*
-		 * We want to default to C1 (hlt), not to busy polling
-		 * unless the timer is happening really really soon, or
-		 * C1's exit latency exceeds the user configured limit.
+		 * Default to a physical idle state, not to busy polling, unless
+		 * a timer is going to trigger really really soon.
 		 */
 		polling_threshold = max_t(unsigned int, 20, s->target_residency);
 		if (data->next_timer_us > polling_threshold &&