[PATCH 03/15] sched/cputime: Correctly support generic vtime idle time

[Peter Zijlstra]

On Fri, Jan 16, 2026 at 03:51:56PM +0100, Frederic Weisbecker wrote:

> diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
> index 8ddf74e705d3..f1d07a0276a5 100644
> --- a/kernel/time/tick-sched.c
> +++ b/kernel/time/tick-sched.c
> @@ -780,7 +780,7 @@ static u64 get_cpu_sleep_time_us(struct tick_sched *ts, ktime_t *sleeptime,
>  	ktime_t now, idle;
>  	unsigned int seq;
>  
> -	if (!tick_nohz_active)
> +	if (!tick_nohz_active || vtime_generic_enabled_cpu(cpu))
>  		return -1;
>  
>  	now = ktime_get();

Is this not broken? IIUC this means that you can no longer use
get_cpu_{idle,iowait}_time_us() the moment you have context tracking
enabled.