linux-kernel - [PATCH v2 3/4] cpuidle: menu: use DIV_ROUND_CLOSEST

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Message-Id: <1427205825-5444-4-git-send-email-javi.merino@arm.com>
Date:	Tue, 24 Mar 2015 14:03:44 +0000
From:	Javi Merino <javi.merino@....com>
To:	akpm@...ux-foundation.org
Cc:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, emil.l.velikov@...il.com,
	jepler@...ythonic.net, daniel@...ll.ch,
	Javi Merino <javi.merino@....com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Mel Gorman <mgorman@...e.de>,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: [PATCH v2 3/4] cpuidle: menu: use DIV_ROUND_CLOSEST_ULL()

Now that the kernel provides DIV_ROUND_CLOSEST_ULL(), drop the internal
implementation and use the kernel one.

Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Stephen Hemminger <shemminger@...ux-foundation.org>
Signed-off-by: Javi Merino <javi.merino@....com>
---
 drivers/cpuidle/governors/menu.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 40580794e23d..b8a5fa15ca24 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -190,12 +190,6 @@ static DEFINE_PER_CPU(struct menu_device, menu_devices);
 
 static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev);
 
-/* This implements DIV_ROUND_CLOSEST but avoids 64 bit division */
-static u64 div_round64(u64 dividend, u32 divisor)
-{
-	return div_u64(dividend + (divisor / 2), divisor);
-}
-
 /*
  * Try detecting repeating patterns by keeping track of the last 8
  * intervals, and checking if the standard deviation of that set
@@ -317,7 +311,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
 	 * operands are 32 bits.
 	 * Make sure to round up for half microseconds.
 	 */
-	data->predicted_us = div_round64((uint64_t)data->next_timer_us *
+	data->predicted_us = DIV_ROUND_CLOSEST_ULL((uint64_t)data->next_timer_us *
 					 data->correction_factor[data->bucket],
 					 RESOLUTION * DECAY);
 
-- 
1.9.1

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