On Fri, 2017-08-11 at 09:55 +0200, Mike Galbraith wrote:
> The below fixes the list debug explosion up.
>
> If we do not migrate expired/deferred timers during cpu offline, ->cb_entry
> will be corrupted by online initialization of base->expired, leading to a
> loud list debug complaint should someone call __remove_hrtimer() thereafter.
>
> Signed-off-by: Mike Galvraith <efault@xxxxxx>
ahem.....................b
> ---
> kernel/time/hrtimer.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> --- a/kernel/time/hrtimer.c
> +++ b/kernel/time/hrtimer.c
> @@ -1802,6 +1802,19 @@ static void migrate_hrtimer_list(struct
> */
> enqueue_hrtimer(timer, new_base);
> }
> +
> + /*
> + * Finally, migrate any expired timers deferred by RT.
> + */
> + while (!list_empty(&old_base->expired)) {
> + struct list_head *entry = old_base->expired.next;
> +
> + timer = container_of(entry, struct hrtimer, cb_entry);
> + /* XXX: hm, perhaps defer again instead of enqueueing. */
> + __remove_hrtimer(timer, old_base, HRTIMER_STATE_ENQUEUED, 0);
> + timer->base = new_base;
> + enqueue_hrtimer(timer, new_base);
> + }
> }
>
> int hrtimers_dead_cpu(unsigned int scpu)
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