[patch 7/7] timekeeping: Reduce seqcount section to updatetimekeeper/xtime

[Thomas Gleixner]

The calculation of the timekeeping values is now decoupled from
timekeeper/xtime which are used by the readers. So we can confine the
seqcount section to the mere update of the reader side data.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 kernel/time/timekeeping.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Index: linux-2.6-tip/kernel/time/timekeeping.c
===================================================================
--- linux-2.6-tip.orig/kernel/time/timekeeping.c
+++ linux-2.6-tip/kernel/time/timekeeping.c
@@ -986,7 +986,10 @@ static void update_wall_time(void)
 		xtime_calc.tv_sec++;
 		second_overflow();
 	}
+}
 
+static void update_timekeeper(void)
+{
 	timekeeper = tk_calc;
 	xtime = xtime_calc;
 
@@ -1126,10 +1129,13 @@ struct timespec get_monotonic_coarse(voi
  */
 void do_timer(unsigned long ticks)
 {
+	update_wall_time();
+
 	write_seqcount_begin(&xtime_seq);
 	jiffies_64 += ticks;
-	update_wall_time();
+	update_timekeeper();
 	write_seqcount_end(&xtime_seq);
+
 	calc_global_load(ticks);
 }
 


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