From: Pavel Tatashin Date: Mon, 12 Jun 2017 20:41:43 +0000 (-0400) Subject: sparc64: show time stamps from zero X-Git-Tag: v4.13-rc1~93^2~6^2~5 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b5dd4d807f0fe7da67c5cc67b2ec681b60e4994b;p=linux.git sparc64: show time stamps from zero 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 Reviewed-by: Bob Picco Reviewed-by: Steven Sistare Signed-off-by: David S. Miller --- diff --git a/arch/sparc/kernel/time_64.c b/arch/sparc/kernel/time_64.c index 6724bcbc3526..5f53b74dd493 100644 --- a/arch/sparc/kernel/time_64.c +++ b/arch/sparc/kernel/time_64.c @@ -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)