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timers/itimer: Keep a nonzero value at CPU timer expiry

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get_cpu_itimer() returns a zero remaining time when the sampled CPU time
is exactly equal to the nonzero expiry. This makes an armed ITIMER_VIRTUAL
or ITIMER_PROF timer appear disarmed.

The cputime cleanup replaced cputime_le(), which implements <=, with <.
Restore the inclusive comparison so the equality case returns TICK_NSEC,
like the overdue case and set_process_cpu_timer().

Fixes: 648616343c ("[S390] cputime: add sparse checking and cleanup")
Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261020223957.87842-1-dennylin0707@gmail.com
This commit is contained in:
Hungyu Lin 2026-10-20 22:39:57 +00:00 committed by Thomas Gleixner
parent 5b819071e4
commit ef60f61208
1 changed files with 1 additions and 1 deletions
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kernel/time/itimer.c
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@ -60,7 +60,7 @@ static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
thread_group_sample_cputime(tsk, samples);
t = samples[clock_id];
if (val < t)
if (val <= t)
/* about to fire */
val = TICK_NSEC;
else