From 11b8633ada8633991e584951d0027f2741162201 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Wed, 23 Nov 2011 20:07:19 +0000 Subject: [PATCH] powerpc/time: Use clocksource_register_hz Use clocksource_register_hz which calculates the shift/mult factors for us. Also remove the shift = 22 assumption in vsyscall_update - thanks to Paul Mackerras and John Stultz for catching that. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/time.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index fae3094c2a9a..d204b726a185 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -86,8 +86,6 @@ static struct clocksource clocksource_rtc = { .rating = 400, .flags = CLOCK_SOURCE_IS_CONTINUOUS, .mask = CLOCKSOURCE_MASK(64), - .shift = 22, - .mult = 0, /* To be filled in */ .read = rtc_read, }; @@ -97,8 +95,6 @@ static struct clocksource clocksource_timebase = { .rating = 400, .flags = CLOCK_SOURCE_IS_CONTINUOUS, .mask = CLOCKSOURCE_MASK(64), - .shift = 22, - .mult = 0, /* To be filled in */ .read = timebase_read, }; @@ -822,9 +818,8 @@ void update_vsyscall(struct timespec *wall_time, struct timespec *wtm, ++vdso_data->tb_update_count; smp_mb(); - /* XXX this assumes clock->shift == 22 */ - /* 4611686018 ~= 2^(20+64-22) / 1e9 */ - new_tb_to_xs = (u64) mult * 4611686018ULL; + /* 19342813113834067 ~= 2^(20+64) / 1e9 */ + new_tb_to_xs = (u64) mult * (19342813113834067ULL >> clock->shift); new_stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC; do_div(new_stamp_xsec, 1000000000); new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC; @@ -875,9 +870,7 @@ static void __init clocksource_init(void) else clock = &clocksource_timebase; - clock->mult = clocksource_hz2mult(tb_ticks_per_sec, clock->shift); - - if (clocksource_register(clock)) { + if (clocksource_register_hz(clock, tb_ticks_per_sec)) { printk(KERN_ERR "clocksource: %s is already registered\n", clock->name); return; -- 2.20.1