From nobody Tue Dec 16 20:00:16 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 68F96179AD for ; Mon, 15 Jan 2024 14:38:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Kd6kcmWr"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="NJleEKH8" From: Anna-Maria Behnsen DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1705329486; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ID/05caAQ7viG6IvKvJwH4SWuLM7iMQOtASJkbsjYUE=; b=Kd6kcmWrMdGquSj5bS/s2WvOQTwxrPJ29PzQN8y3YkLHLxB8kkZYrV0QHBCCkD3W8/SUJ+ CvCmeqwAR8j5N5psDYLVrIspyBcre5NiN1VDnxxPczpjh274XKrO6Putyl9p8bpYevuSyi MhKXjwjPJmUFV9OfUePjAjZI3eFB/D3ZzeVzlM5uWusnWfYMSzt20rnurcXZiCM5mpf9Ff gHquLdZkSPZL2tTWjih6hj+Uw2d2Nw/Dq20Hzmzq20zei053PApLVeVDdYJFOAcQ4Oi6+M lw2UuXQuWUolN1qXre4fomZA5Mi57m9FRoCFSTOq3i/B/3ybnN7ykOuwcLCYnA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1705329486; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ID/05caAQ7viG6IvKvJwH4SWuLM7iMQOtASJkbsjYUE=; b=NJleEKH8Ghy/Gbl6g2GgfGmK8C28DDGE4e44xPDO+2QBqPAAAdluGRrg4G0VbHCGvYR03Y Y2/ELZ67he0XRhAA== To: linux-kernel@vger.kernel.org Cc: Peter Zijlstra , John Stultz , Thomas Gleixner , Eric Dumazet , "Rafael J . Wysocki" , Arjan van de Ven , "Paul E . McKenney" , Frederic Weisbecker , Rik van Riel , Steven Rostedt , Sebastian Siewior , Giovanni Gherdovich , Lukasz Luba , "Gautham R . Shenoy" , Srinivas Pandruvada , K Prateek Nayak , Anna-Maria Behnsen Subject: [PATCH v10 07/20] timers: add_timer_on(): Make sure TIMER_PINNED flag is set Date: Mon, 15 Jan 2024 15:37:30 +0100 Message-Id: <20240115143743.27827-8-anna-maria@linutronix.de> In-Reply-To: <20240115143743.27827-1-anna-maria@linutronix.de> References: <20240115143743.27827-1-anna-maria@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" set When adding a timer to the timer wheel using add_timer_on(), it is an implicitly pinned timer. With the timer pull at expiry time model in place, TIMER_PINNED flag is required to make sure timers end up in proper base. Add TIMER_PINNED flag unconditionally when add_timer_on() is executed. Signed-off-by: Anna-Maria Behnsen Reviewed-by: Frederic Weisbecker --- kernel/time/timer.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 3cf016d6fa59..fc4c406c9ec7 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1284,7 +1284,10 @@ EXPORT_SYMBOL(add_timer_global); * @timer: The timer to be started * @cpu: The CPU to start it on * - * Same as add_timer() except that it starts the timer on the given CPU. + * Same as add_timer() except that it starts the timer on the given CPU and + * the TIMER_PINNED flag is set. When timer shouldn't be a pinned timer in + * the next round, add_timer_global() should be used instead as it unsets + * the TIMER_PINNED flag. * * See add_timer() for further details. */ @@ -1298,6 +1301,9 @@ void add_timer_on(struct timer_list *timer, int cpu) if (WARN_ON_ONCE(timer_pending(timer))) return; =20 + /* Make sure timer flags have TIMER_PINNED flag set */ + timer->flags |=3D TIMER_PINNED; + new_base =3D get_timer_cpu_base(timer->flags, cpu); =20 /* --=20 2.39.2