From 5de62ea84abd732ded7c5569426fd71c0420f83e Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 21 Sep 2021 22:16:02 +0200 Subject: sched,livepatch: Use wake_up_if_idle() Make sure to prod idle CPUs so they call klp_update_patch_state(). Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Petr Mladek Acked-by: Miroslav Benes Acked-by: Vasily Gorbik Tested-by: Petr Mladek Tested-by: Vasily Gorbik # on s390 Link: https://lkml.kernel.org/r/20210929151723.162004989@infradead.org --- kernel/livepatch/transition.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'kernel/livepatch') diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index 75251e9dbc3c..5683ac0d2566 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -413,8 +413,11 @@ void klp_try_complete_transition(void) for_each_possible_cpu(cpu) { task = idle_task(cpu); if (cpu_online(cpu)) { - if (!klp_try_switch_task(task)) + if (!klp_try_switch_task(task)) { complete = false; + /* Make idle task go through the main loop. */ + wake_up_if_idle(cpu); + } } else if (task->patch_state != klp_target_state) { /* offline idle tasks can be switched immediately */ clear_tsk_thread_flag(task, TIF_PATCH_PENDING); -- cgit v1.2.3