[tip:sched/core] s390, sched/cputime: Make arch_cpu_idle_time() to return nsecs

[tip-bot for Frederic Weisbecker <tipbot@zytor.com>]

Commit-ID:  42b425b3360a20ed08e0d735623f389bdf5e4500
Gitweb:     http://git.kernel.org/tip/42b425b3360a20ed08e0d735623f389bdf5e4500
Author:     Frederic Weisbecker <fweisbec@gmail.com>
AuthorDate: Tue, 31 Jan 2017 04:09:47 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 1 Feb 2017 09:14:03 +0100

s390, sched/cputime: Make arch_cpu_idle_time() to return nsecs

This way we don't need to deal with cputime_t details from the core code.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1485832191-26889-32-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/s390/include/asm/cputime.h | 2 +-
 arch/s390/kernel/idle.c         | 5 +++--
 fs/proc/stat.c                  | 4 ++--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h
index 221b454..9a94481 100644
--- a/arch/s390/include/asm/cputime.h
+++ b/arch/s390/include/asm/cputime.h
@@ -141,7 +141,7 @@ static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
 	return clock;
 }
 
-cputime64_t arch_cpu_idle_time(int cpu);
+u64 arch_cpu_idle_time(int cpu);
 
 #define arch_idle_time(cpu) arch_cpu_idle_time(cpu)
 
diff --git a/arch/s390/kernel/idle.c b/arch/s390/kernel/idle.c
index 5c0e08e7..d3bf69e 100644
--- a/arch/s390/kernel/idle.c
+++ b/arch/s390/kernel/idle.c
@@ -84,7 +84,7 @@ static ssize_t show_idle_time(struct device *dev,
 }
 DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
 
-cputime64_t arch_cpu_idle_time(int cpu)
+u64 arch_cpu_idle_time(int cpu)
 {
 	struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
 	unsigned long long now, idle_enter, idle_exit;
@@ -96,7 +96,8 @@ cputime64_t arch_cpu_idle_time(int cpu)
 		idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
 		idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
 	} while (read_seqcount_retry(&idle->seqcount, seq));
-	return idle_enter ? ((idle_exit ?: now) - idle_enter) : 0;
+
+	return cputime_to_nsecs(idle_enter ? ((idle_exit ?: now) - idle_enter) : 0);
 }
 
 void arch_cpu_idle_enter(void)
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 44475a4..e47c3e8 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -27,7 +27,7 @@ static u64 get_idle_time(int cpu)
 
 	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
 	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
-		idle += cputime_to_nsecs(arch_idle_time(cpu));
+		idle += arch_idle_time(cpu);
 	return idle;
 }
 
@@ -37,7 +37,7 @@ static u64 get_iowait_time(int cpu)
 
 	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
 	if (cpu_online(cpu) && nr_iowait_cpu(cpu))
-		iowait += cputime_to_nsecs(arch_idle_time(cpu));
+		iowait += arch_idle_time(cpu);
 	return iowait;
 }