diff options
Diffstat (limited to 'arch/arm/kernel/sched_clock.c')
| -rw-r--r-- | arch/arm/kernel/sched_clock.c | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c deleted file mode 100644 index 9a46370fe9d..00000000000 --- a/arch/arm/kernel/sched_clock.c +++ /dev/null @@ -1,74 +0,0 @@ -/* - * sched_clock.c: support for extending counters to full 64-bit ns counter - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include <linux/clocksource.h> -#include <linux/init.h> -#include <linux/jiffies.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/timer.h> - -#include <asm/sched_clock.h> - -static void sched_clock_poll(unsigned long wrap_ticks); -static DEFINE_TIMER(sched_clock_timer, sched_clock_poll, 0, 0); -static void (*sched_clock_update_fn)(void); - -static void sched_clock_poll(unsigned long wrap_ticks) -{ - mod_timer(&sched_clock_timer, round_jiffies(jiffies + wrap_ticks)); - sched_clock_update_fn(); -} - -void __init init_sched_clock(struct clock_data *cd, void (*update)(void), - unsigned int clock_bits, unsigned long rate) -{ - unsigned long r, w; - u64 res, wrap; - char r_unit; - - sched_clock_update_fn = update; - - /* calculate the mult/shift to convert counter ticks to ns. */ - clocks_calc_mult_shift(&cd->mult, &cd->shift, rate, NSEC_PER_SEC, 0); - - r = rate; - if (r >= 4000000) { - r /= 1000000; - r_unit = 'M'; - } else { - r /= 1000; - r_unit = 'k'; - } - - /* calculate how many ns until we wrap */ - wrap = cyc_to_ns((1ULL << clock_bits) - 1, cd->mult, cd->shift); - do_div(wrap, NSEC_PER_MSEC); - w = wrap; - - /* calculate the ns resolution of this counter */ - res = cyc_to_ns(1ULL, cd->mult, cd->shift); - pr_info("sched_clock: %u bits at %lu%cHz, resolution %lluns, wraps every %lums\n", - clock_bits, r, r_unit, res, w); - - /* - * Start the timer to keep sched_clock() properly updated and - * sets the initial epoch. - */ - sched_clock_timer.data = msecs_to_jiffies(w - (w / 10)); - update(); - - /* - * Ensure that sched_clock() starts off at 0ns - */ - cd->epoch_ns = 0; -} - -void __init sched_clock_postinit(void) -{ - sched_clock_poll(sched_clock_timer.data); -} |
