From nobody Sat Apr 18 09:10:29 2026 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 F096248123C; Sat, 28 Feb 2026 15:37:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772293028; cv=none; b=DbNAM3Gst4OGY04EHeoWpxvCtKvyf6z4tNTgaAAfEk6tnXUXqPtvwjlPzYdlRFzzKovem0iZuzKarcBR1xtn2rXwjd14fmHvRvKI0bcvbQ1I3QjI/K8COHn7voNE3pIHrevxVDN6STy80btO1sM1ZIm7K83DqIlxcaOMgJUiBo8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772293028; c=relaxed/simple; bh=dyo7Ictp9aQ4U/6VnBPw8rqs71KsLGbG/iV5WBpScp8=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=VA54v+1d96scfuGZOtd8SPPr6o+2libLjGn0Up0eZTQ4WmsK/960L1utxMezYuASZTAZIAAMDIq9BanqmKImNOynKpS+g4j/FLtvWXL+pK0wofnlJNiN16ijmMcCu9/ImAS6iEaf/KwkJcLPFPSLt0Tog+hcRs/3DUTGr4pQXGY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=bENjfcTc; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=zy0NMiZV; arc=none smtp.client-ip=193.142.43.55 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="bENjfcTc"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="zy0NMiZV" Date: Sat, 28 Feb 2026 15:36:59 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1772293020; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MpDD/+/RKkvKsUrszxgFtHqYfBvEjeGG2w4/znaSDOM=; b=bENjfcTcVtiPfCqXqqBk3t5V4xsGN4zQnw54eI3BytEQwB9Bln8SCe9KZKWCLjJVbFeBz0 f/ywRKxV3JC+u0s2WVs3+SbTQEKCRCRNN5tF4p9MIpe3K1bQbBflCASzAEmxUfNK0MxoRo TIqyn0d98Qf9D4mwKIYa42BJ0HmPqw4Hnj7Mjp0V+BP983cv02YP5y7yaX1qNmp+y2RXWz YHtZqOS1TpK3BoGyMuj9tyv6tDC6SjEzLxfqSRf3O9mYqWkCcXQqq5MLfpLPXcWXobAjf0 u2jTc4JAFi9D+i3OlFyeaTa7zsF0aa6tT+h+ZozswBHLEHMutfmutU6V4eSPuw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1772293020; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MpDD/+/RKkvKsUrszxgFtHqYfBvEjeGG2w4/znaSDOM=; b=zy0NMiZVhO2otnwZvgmm0BY/TvTRyQa1jjiFx3uvRk0x7BVqoBZ4HeAOQwyavs8QNCiB3H 6UL2WnBGNl9SzYAQ== From: "tip-bot2 for Peter Zijlstra" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/hrtick] hrtimer: Avoid pointless reprogramming in __hrtimer_start_range_ns() Cc: "Peter Zijlstra (Intel)" , Thomas Gleixner , Juri Lelli , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20260224163429.069535561@kernel.org> References: <20260224163429.069535561@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <177229301912.1647592.5477764775060482953.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the sched/hrtick branch of tip: Commit-ID: d19ff16c11db38f3ee179d72751fb9b340174330 Gitweb: https://git.kernel.org/tip/d19ff16c11db38f3ee179d72751fb9b34= 0174330 Author: Peter Zijlstra AuthorDate: Tue, 24 Feb 2026 17:35:37 +01:00 Committer: Peter Zijlstra CommitterDate: Fri, 27 Feb 2026 16:40:04 +01:00 hrtimer: Avoid pointless reprogramming in __hrtimer_start_range_ns() Much like hrtimer_reprogram(), skip programming if the cpu_base is running the hrtimer interrupt. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Juri Lelli Reviewed-by: Thomas Gleixner Link: https://patch.msgid.link/20260224163429.069535561@kernel.org --- kernel/time/hrtimer.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 860af7a..3088db4 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1269,6 +1269,14 @@ static int __hrtimer_start_range_ns(struct hrtimer *= timer, ktime_t tim, } =20 first =3D enqueue_hrtimer(timer, new_base, mode); + + /* + * If the hrtimer interrupt is running, then it will reevaluate the + * clock bases and reprogram the clock event device. + */ + if (new_base->cpu_base->in_hrtirq) + return false; + if (!force_local) { /* * If the current CPU base is online, then the timer is