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Date:	Sun, 21 Dec 2014 19:46:57 +0100
From:	Richard Cochran <>
To:	<>
Cc:	<>, Amir Vadai <>,
	Ariel Elior <>,
	Carolyn Wyborny <>,
	David Miller <>,
	Frank Li <>,
	Jeff Kirsher <>,
	John Stultz <>,
	Matthew Vick <>,
	Miroslav Lichvar <>,
	Mugunthan V N <>,
	Or Gerlitz <>,
	Thomas Gleixner <>,
	Tom Lendacky <>
Subject: [PATCH net-next 02/11] timecounter: provide a helper function to shift the time.

Some PTP Hardware Clock drivers use a struct timecounter to represent
their clock. To adjust the time by a given offset, these drivers all
perform a two step read/write of their timecounter. However, it is
better and simpler just to adjust the offset in one step. This patch
introduces a little routine to help drivers implement the adjtime

Suggested-by: Janusz U┼╝ycki <>
Signed-off-by: Richard Cochran <>
 include/linux/timecounter.h |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/timecounter.h b/include/linux/timecounter.h
index 146f07a..af3dfa4 100644
--- a/include/linux/timecounter.h
+++ b/include/linux/timecounter.h
@@ -79,6 +79,15 @@ static inline u64 cyclecounter_cyc2ns(const struct cyclecounter *cc,
+ * timecounter_adjtime - Shifts the time of the clock.
+ * @delta:	Desired change in nanoseconds.
+ */
+static inline void timecounter_adjtime(struct timecounter *tc, s64 delta)
+	tc->nsec += delta;
  * timecounter_init - initialize a time counter
  * @tc:			Pointer to time counter which is to be initialized/reset
  * @cc:			A cycle counter, ready to be used.

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