linux-kernel - [Patch 1/5] I/O statistics through request queues: timeval_to

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Message-Id: <1161435445.3054.112.camel@dyn-9-152-230-71.boeblingen.de.ibm.com>
Date:	Sat, 21 Oct 2006 14:57:25 +0200
From:	Martin Peschke <mp3@...ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [Patch 1/5] I/O statistics through request queues: timeval_to_us()

The next patch requires a timeval-to-microseconds conversion.
Introducing a helper function (and fixing a comment).

Signed-off-by: Martin Peschke <mp3@...ibm.com>
---

 time.h |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletion(-)

diff -urp a/include/linux/time.h b/include/linux/time.h
--- a/include/linux/time.h	2006-10-03 16:25:53.000000000 +0200
+++ b/include/linux/time.h	2006-10-06 21:36:08.000000000 +0200
@@ -133,8 +133,20 @@ static inline s64 timespec_to_ns(const s
 }
 
 /**
+ * timeval_to_us - Convert timeval to microseconds
+ * @tv:		pointer to the timeval variable to be converted
+ *
+ * Returns the scalar nanosecond representation of the timeval
+ * parameter.
+ */
+static inline s64 timeval_to_us(const struct timeval *tv)
+{
+	return ((s64) tv->tv_sec * USEC_PER_SEC) + tv->tv_usec;
+}
+
+/**
  * timeval_to_ns - Convert timeval to nanoseconds
- * @ts:		pointer to the timeval variable to be converted
+ * @tv:		pointer to the timeval variable to be converted
  *
  * Returns the scalar nanosecond representation of the timeval
  * parameter.


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