From: Frederic Weisbecker Date: Fri, 8 May 2026 13:16:34 +0000 (+0200) Subject: sched/idle: Handle offlining first in idle loop X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=0236aaf07b406100c8c3a6b78dba211f32449f49;p=thirdparty%2Fkernel%2Flinux.git sched/idle: Handle offlining first in idle loop Offline handling happens from within the inner idle loop, after the beginning of dyntick cputime accounting, nohz idle load balancing and TIF_NEED_RESCHED polling. This is not necessary and even buggy because: * There is no dyntick handling to do. And calling tick_nohz_idle_enter() messes up with the struct tick_sched reset that was performed on tick_sched_timer_dying(). * There is no nohz idle balancing to do. * Polling on TIF_RESCHED is irrelevant at this stage, there are no more tasks allowed to run. * No need to check if need_resched() before offline handling since stop_machine is done and all per-cpu kthread should be done with their job. Therefore move the offline handling at the beginning of the idle loop. This will also ease the idle cputime unification later by not elapsing idle time while offline through the call to: tick_nohz_idle_enter() -> tick_nohz_start_idle() Signed-off-by: Frederic Weisbecker Signed-off-by: Thomas Gleixner Tested-by: Shrikanth Hegde Reviewed-by: Rafael J. Wysocki (Intel) Reviewed-by: Shrikanth Hegde Link: https://patch.msgid.link/20260508131647.43868-3-frederic@kernel.org --- diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index a83be0c834ddb..aa7e3dc598561 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -280,6 +280,14 @@ static void do_idle(void) int cpu = smp_processor_id(); bool got_tick = false; + if (cpu_is_offline(cpu)) { + local_irq_disable(); + /* All per-CPU kernel threads should be done by now. */ + WARN_ON_ONCE(need_resched()); + cpuhp_report_idle_dead(); + arch_cpu_idle_dead(); + } + /* * Check if we need to update blocked load */ @@ -331,11 +339,6 @@ static void do_idle(void) */ local_irq_disable(); - if (cpu_is_offline(cpu)) { - cpuhp_report_idle_dead(); - arch_cpu_idle_dead(); - } - arch_cpu_idle_enter(); rcu_nocb_flush_deferred_wakeup();