linux-kernel - [RFC][Patch 05/18] sched: update this_cpu

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Message-Id: <1303332697-16426-6-git-send-email-ncrao@google.com>
Date:	Wed, 20 Apr 2011 13:51:24 -0700
From:	Nikhil Rao <ncrao@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>
Cc:	Paul Turner <pjt@...gle.com>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org, Nikhil Rao <ncrao@...gle.com>
Subject: [RFC][Patch 05/18] sched: update this_cpu_load() to return u64 value

The idlecpu governor uses this_cpu_load() for calculations which is now returns
u64. Update idlecpu governor to also use u64.

Signed-off-by: Nikhil Rao <ncrao@...gle.com>
---
 drivers/cpuidle/governors/menu.c |    5 ++---
 include/linux/sched.h            |    2 +-
 kernel/sched.c                   |    2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index f508690..2051134 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -127,10 +127,9 @@ struct menu_device {
 
 static int get_loadavg(void)
 {
-	unsigned long this = this_cpu_load();
+	u64 this = this_cpu_load();
 
-
-	return LOAD_INT(this) * 10 + LOAD_FRAC(this) / 10;
+	return div_u64(LOAD_INT(this) * 10 + LOAD_FRAC(this), 10);
 }
 
 static inline int which_bucket(unsigned int duration)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6d88be1..546a418 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -140,7 +140,7 @@ extern unsigned long nr_running(void);
 extern unsigned long nr_uninterruptible(void);
 extern unsigned long nr_iowait(void);
 extern unsigned long nr_iowait_cpu(int cpu);
-extern unsigned long this_cpu_load(void);
+extern u64 this_cpu_load(void);
 
 
 extern void calc_global_load(unsigned long ticks);
diff --git a/kernel/sched.c b/kernel/sched.c
index 94dd1df..175764b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3062,7 +3062,7 @@ unsigned long nr_iowait_cpu(int cpu)
 	return atomic_read(&this->nr_iowait);
 }
 
-unsigned long this_cpu_load(void)
+u64 this_cpu_load(void)
 {
 	struct rq *this = this_rq();
 	return this->cpu_load[0];
-- 
1.7.3.1

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