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[v2,3/8] sparc64: show time stamps from zero

Message ID 1497286107-974183-4-git-send-email-pasha.tatashin@oracle.com
State Changes Requested
Delegated to: David Miller
Headers show

Commit Message

Pavel Tatashin June 12, 2017, 4:48 p.m. UTC 
On most platforms, time is shown from the beginning of boot.  This patch is
adding offset to sched_clock() for SPARC, to also show time from 0.

This means we will have one more load, but we saved one in an ealier patch.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
---
 arch/sparc/kernel/time_64.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/sparc/kernel/time_64.c b/arch/sparc/kernel/time_64.c
index 6724bcb..5f53b74 100644
--- a/arch/sparc/kernel/time_64.c
+++ b/arch/sparc/kernel/time_64.c
@@ -392,6 +392,7 @@  static int hbtick_add_compare(unsigned long adj)
 };
 
 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
+static unsigned long timer_offset __read_mostly;
 
 unsigned long cmos_regs;
 EXPORT_SYMBOL(cmos_regs);
@@ -786,6 +787,10 @@  void __init time_init(void)
 	timer_ticks_per_nsec_quotient =
 		clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT);
 
+	timer_offset = (tick_operations.get_tick()
+			* timer_ticks_per_nsec_quotient)
+			>> SPARC64_NSEC_PER_CYC_SHIFT;
+
 	clocksource_tick.name = tick_operations.name;
 	clocksource_tick.read = clocksource_tick_read;
 
@@ -813,8 +818,9 @@  unsigned long long sched_clock(void)
 {
 	unsigned long ticks = tick_operations.get_tick();
 
-	return (ticks * timer_ticks_per_nsec_quotient)
-		>> SPARC64_NSEC_PER_CYC_SHIFT;
+	return ((ticks * timer_ticks_per_nsec_quotient)
+		>> SPARC64_NSEC_PER_CYC_SHIFT)
+		- timer_offset;
 }
 
 int read_current_timer(unsigned long *timer_val)