Re: [patch V2 02/11] hrtimer: Use hrtimer_start_expires_user() for hrtimer sleepers

[Frederic Weisbecker]

Le Wed, Apr 08, 2026 at 01:53:52PM +0200, Thomas Gleixner a écrit :
> Most hrtimer sleepers are user controlled and user space can hand arbitrary
> expiry values in as long as they are valid timespecs. If the expiry value
> is in the past then this requires a full loop through reprogramming the
> clock event device, taking the hrtimer interrupt, waking the task and
> reprogram again.
> 
> Use hrtimer_start_expires_user() which avoids the full round trip by
> checking the timer for expiry on enqueue.
> 
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> Cc: Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx>
> Cc: Frederic Weisbecker <frederic@xxxxxxxxxx>

Reviewed-by: Frederic Weisbecker <frederic@xxxxxxxxxx>

-- 
Frederic Weisbecker
SUSE Labs