[mirror_ubuntu-jammy-kernel.git] / kernel / time / tick-legacy.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Timer tick function for architectures that lack generic clockevents,
 * consolidated here from m68k/ia64/parisc/arm.
 */

#include <linux/irq.h>
#include <linux/profile.h>
#include <linux/timekeeper_internal.h>

#include "tick-internal.h"

/**
 * legacy_timer_tick() - advances the timekeeping infrastructure
 * @ticks:	number of ticks, that have elapsed since the last call.
 *
 * This is used by platforms that have not been converted to
 * generic clockevents.
 *
 * If 'ticks' is zero, the CPU is not handling timekeeping, so
 * only perform process accounting and profiling.
 *
 * Must be called with interrupts disabled.
 */
void legacy_timer_tick(unsigned long ticks)
{
	if (ticks) {
		raw_spin_lock(&jiffies_lock);
		write_seqcount_begin(&jiffies_seq);
		do_timer(ticks);
		write_seqcount_end(&jiffies_seq);
		raw_spin_unlock(&jiffies_lock);
		update_wall_time();
	}
	update_process_times(user_mode(get_irq_regs()));
	profile_tick(CPU_PROFILING);
}
Commit	Line	Data
b3550164 AB	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Timer tick function for architectures that lack generic clockevents,
	4	* consolidated here from m68k/ia64/parisc/arm.
	5	*/
	6
	7	#include <linux/irq.h>
	8	#include <linux/profile.h>
	9	#include <linux/timekeeper_internal.h>
	10
	11	#include "tick-internal.h"
	12
56cc7b8a AB	13	/**
	14	* legacy_timer_tick() - advances the timekeeping infrastructure
	15	* @ticks: number of ticks, that have elapsed since the last call.
	16	*
	17	* This is used by platforms that have not been converted to
	18	* generic clockevents.
	19	*
	20	* If 'ticks' is zero, the CPU is not handling timekeeping, so
	21	* only perform process accounting and profiling.
	22	*
	23	* Must be called with interrupts disabled.
	24	*/
b3550164 AB	25	void legacy_timer_tick(unsigned long ticks)
b3550164 AB	26	{
56cc7b8a AB	27	if (ticks) {
	28	raw_spin_lock(&jiffies_lock);
	29	write_seqcount_begin(&jiffies_seq);
	30	do_timer(ticks);
	31	write_seqcount_end(&jiffies_seq);
	32	raw_spin_unlock(&jiffies_lock);
	33	update_wall_time();
	34	}
b3550164 AB	35	update_process_times(user_mode(get_irq_regs()));
	36	profile_tick(CPU_PROFILING);
	37	}