From ef60f61208a30eb5b941b707debdf04517271b4f Mon Sep 17 00:00:00 2001 From: Hungyu Lin Date: Tue, 20 Oct 2026 22:39:57 +0000 Subject: [PATCH] timers/itimer: Keep a nonzero value at CPU timer expiry 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: 648616343cdb ("[S390] cputime: add sparse checking and cleanup") Signed-off-by: Hungyu Lin Signed-off-by: Thomas Gleixner Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20261020223957.87842-1-dennylin0707@gmail.com --- kernel/time/itimer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c index 03a32dffc56c..f7de39769095 100644 --- a/kernel/time/itimer.c +++ b/kernel/time/itimer.c @@ -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