When CPU hotplugging is enabled, the user may want to remove the
current CPU which is providing the timer ticks. If this happens
we need to find a new timesync master.
Signed-off-by: Helge Deller <deller@gmx.de>
extern struct system_cpuinfo_parisc boot_cpu_data;
DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
+extern int time_keeper_id; /* CPU used for timekeeping */
#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
*/
set_cpu_online(cpu, false);
+ /* Find a new timesync master */
+ if (cpu == time_keeper_id) {
+ time_keeper_id = cpumask_first(cpu_online_mask);
+ pr_info("CPU %d is now promoted to time-keeper master\n", time_keeper_id);
+ }
+
disable_percpu_irq(IPI_IRQ);
irq_migrate_all_off_this_cpu();
#include <linux/timex.h>
+int time_keeper_id __read_mostly; /* CPU used for timekeeping. */
+
static unsigned long clocktick __ro_after_init; /* timer cycles per tick */
/*
cpuinfo->it_value = next_tick;
/* Go do system house keeping. */
- if (cpu != 0)
+ if (IS_ENABLED(CONFIG_SMP) && (cpu != time_keeper_id))
ticks_elapsed = 0;
legacy_timer_tick(ticks_elapsed);