[PATCH RESEND 32/36] s390: Make arch_cpu_idle_time() to return nsecs

[Frederic Weisbecker]

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

Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Michael Ellerman <m...@ellerman.id.au>
Cc: Heiko Carstens <heiko.carst...@de.ibm.com>
Cc: Martin Schwidefsky <schwidef...@de.ibm.com>
Cc: Tony Luck <tony.l...@intel.com>
Cc: Fenghua Yu <fenghua...@intel.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Rik van Riel <r...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Stanislaw Gruszka <sgrus...@redhat.com>
Cc: Wanpeng Li <wanpeng...@hotmail.com>
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
---
 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;
 }
 
-- 
2.7.4