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Tue, 20 Oct 2026 15:48:35 -0700 (PDT) Received: from localhost.localdomain ([98.148.34.5]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1903aff3481sm1517409c88.10.2026.10.20.15.48.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 15:48:35 -0700 (PDT) From: Hungyu Lin To: anna-maria@linutronix.de, frederic@kernel.org Cc: tglx@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Hungyu Lin Subject: [PATCH] timers/itimer: Keep a nonzero value at CPU timer expiry Date: Tue, 20 Oct 2026 22:39:57 +0000 Message-ID: <20261020223957.87842-1-dennylin0707@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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") Cc: stable@vger.kernel.org Signed-off-by: Hungyu Lin --- 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 -- 2.43.0