linux-kernel - [PATCH 3/3] clocksource: get rid of clocksource_calc_mult

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Date:	Thu,  1 Dec 2011 15:20:16 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 3/3] clocksource: get rid of clocksource_calc_mult_shift()

Encourage the user to use clocksource_register_hz/khz(), and
lose the burden of maintainer.

Signed-off-by: Yong Zhang <yong.zhang0@...il.com>
Cc: John Stultz <johnstul@...ibm.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/clocksource.h |    3 ---
 kernel/time/clocksource.c   |   19 -------------------
 2 files changed, 0 insertions(+), 22 deletions(-)

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index a02a8d7..f018278 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -314,9 +314,6 @@ static inline void __clocksource_updatefreq_khz(struct clocksource *cs, u32 khz)
 	__clocksource_updatefreq_scale(cs, 1000, khz);
 }
 
-extern void
-clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec);
-
 #ifdef CONFIG_GENERIC_TIME_VSYSCALL
 extern void
 update_vsyscall(struct timespec *ts, struct timespec *wtm,
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 5119042..a75bd7b 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -724,25 +724,6 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
 }
 EXPORT_SYMBOL_GPL(__clocksource_register_scale);
 
-void clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec)
-{
-	clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
-				NSEC_PER_SEC, minsec);
-
-	/*
-	 * for clocksources that have large mults, to avoid overflow.
-	 * Since mult may be adjusted by ntp, add an safety extra margin
-	 *
-	 */
-	cs->maxadj = clocksource_max_adjustment(cs);
-	while ((cs->mult + cs->maxadj < cs->mult)
-		|| (cs->mult - cs->maxadj > cs->mult)) {
-		cs->mult >>= 1;
-		cs->shift--;
-		cs->maxadj = clocksource_max_adjustment(cs);
-	}
-}
-
 /**
  * clocksource_register - Used to install new clocksources
  * @t:		clocksource to be registered
-- 
1.7.5.4

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