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 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 */ 25 void legacy_timer_tick(unsigned long ticks) 26 { 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 } 35 update_process_times(user_mode(get_irq_regs())); 36 profile_tick(CPU_PROFILING); 37 } 38