linux-kernel - [RFC][PATCH 14/14] Convert sparc to read/update_persistent

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Message-ID: <1261541771.3508.76.camel@localhost.localdomain>
Date:	Tue, 22 Dec 2009 20:16:11 -0800
From:	john stultz <johnstul@...ibm.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	"David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: [RFC][PATCH 14/14] Convert sparc to read/update_persistent_clock

This patch converts the sparc architecture to use the generic
read_persistent_clock and update_persistent_clock interfaces, reducing
the amount of arch specific code we have to maintain, and allowing for
further cleanups in the future.

I have not built or tested this patch, so help from arch maintainers
would be appreciated.

Signed-off-by: John Stultz <johnstul@...ibm.com>
---
 Kconfig          |    2 +-
 kernel/time_32.c |   15 +++++----------
 2 files changed, 6 insertions(+), 11 deletions(-)


Index: gettimeoffset/arch/sparc/Kconfig
===================================================================
--- gettimeoffset.orig/arch/sparc/Kconfig	2009-12-22 18:50:54.000000000 -0800
+++ gettimeoffset/arch/sparc/Kconfig	2009-12-22 18:51:25.000000000 -0800
@@ -69,7 +69,7 @@ config GENERIC_TIME
 
 config GENERIC_CMOS_UPDATE
 	bool
-	default y if SPARC64
+	default y
 
 config GENERIC_CLOCKEVENTS
 	bool
Index: gettimeoffset/arch/sparc/kernel/time_32.c
===================================================================
--- gettimeoffset.orig/arch/sparc/kernel/time_32.c	2009-12-22 18:50:54.000000000 -0800
+++ gettimeoffset/arch/sparc/kernel/time_32.c	2009-12-22 18:51:25.000000000 -0800
@@ -76,6 +76,11 @@ EXPORT_SYMBOL(profile_pc);
 
 __volatile__ unsigned int *master_l10_counter;
 
+int update_persistent_clock(struct timespec now)
+{
+	return set_rtc_mmss(now.tv_sec);
+}
+
 /*
  * timer_interrupt() needs to keep up the real-time clock,
  * as well as call the "do_timer()" routine every clocktick
@@ -99,16 +104,6 @@ static irqreturn_t timer_interrupt(int d
 
 	do_timer(1);
 
-	/* Determine when to update the Mostek clock. */
-	if (ntp_synced() &&
-	    xtime.tv_sec > last_rtc_update + 660 &&
-	    (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
-	    (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
-	  if (set_rtc_mmss(xtime.tv_sec) == 0)
-	    last_rtc_update = xtime.tv_sec;
-	  else
-	    last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
-	}
 	write_sequnlock(&xtime_lock);
 
 #ifndef CONFIG_SMP


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