[RFC PATCH 06/30] s390: Introduce cputime64_to_nsecs()

[Frederic Weisbecker]

This will be needed for the conversion of kernel stat to nsecs.

Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
 arch/s390/include/asm/cputime.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h
index 820b38a..75ba96f 100644
--- a/arch/s390/include/asm/cputime.h
+++ b/arch/s390/include/asm/cputime.h
@@ -59,6 +59,11 @@ static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
 	return (__force cputime64_t)(jif * (CPUTIME_PER_SEC / HZ));
 }
 
+static inline u64 cputime64_to_nsecs(cputime64_t cputime)
+{
+	return (__force u64)cputime * CPUTIME_PER_USEC * NSEC_PER_USEC;
+}
+
 /*
  * Convert cputime to microseconds and back.
  */
-- 
2.1.3

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