sparc64: show time stamps from zero (b5dd4d80) · Commits · 戴 / test

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> Signed-off-by:

David S. Miller <davem@davemloft.net>

arch/sparc/kernel/time_64.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -392,6 +392,7 @@ static struct sparc64_tick_ops hbtick_operations __read_mostly = {
		};

		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)

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