linux-kernel - [RFC PATCH 06/30] s390: Introduce cputime64_to

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Message-Id: <1417199040-21044-7-git-send-email-fweisbec@gmail.com>
Date:	Fri, 28 Nov 2014 19:23:36 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: [RFC PATCH 06/30] s390: Introduce cputime64_to_nsecs()

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

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Wu Fengguang <fengguang.wu@...el.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 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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