From nobody Tue Jul 14 22:10:22 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 77F9485944 for ; Tue, 5 Mar 2024 15:41:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709653284; cv=none; b=jIgrGo8BTZF2f+6FMTu6RAaiZ5SK0rw/k8vvYdDprGgfUQ6Vl07mCsjj5LHmy6C/hQNaN9pZx81wP3gHcJ+arkuDVQJXA4x9q2/IE9OHTn1QArVllM7iat23ivGULnE4KdNkA/k/p9WvdX1CbFn2PAe/CAi9WCRciqlS6bGd348= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709653284; c=relaxed/simple; bh=luhECAtvT7QNAppxYpVvGiqCYhbBdUPQ8m2Erv7UbZQ=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=p00oyuftcPhM0gh+K5nnphR7il7VmRxdlcU7wYqi+auvP+3ORHfBOkRZKo+BQWD1vjFmbfzWNqAlPWqi2u80NAN7hM0Kr64v+yfNFY7hRIVSWp/GJiCGKledh5isgH8X0jANlqCEjb/lirpEQJD83e4jWeypdmahxDQ9fcqds+c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=QIKYzkd1; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QIKYzkd1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709653274; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=pWUBbxy7MElKnb2mfhbQTl4McdZyvi6kMMuQwNYbO5A=; b=QIKYzkd1y0Gt8Fl/ejvG7KL/wLkfGywxj0n/54PBSAevXol5/Vk6rCj+RtUzuSd5dc7kMy ChoUgO7/U8Lz262l16oDddEs03SzHx5xDYumMuiAR7QI0VkcoJJmjYNu43rUliRS688PCF 4vIcRWlrUmRZ6YYlku/fpZFp0IA5wsU= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-441-jFYYEzwVPH2BH2Bms7fgBg-1; Tue, 05 Mar 2024 10:41:11 -0500 X-MC-Unique: jFYYEzwVPH2BH2Bms7fgBg-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2826E10189BB; Tue, 5 Mar 2024 15:41:08 +0000 (UTC) Received: from tpad.localdomain (unknown [10.96.133.5]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E9CA7492BE8; Tue, 5 Mar 2024 15:41:07 +0000 (UTC) Received: by tpad.localdomain (Postfix, from userid 1000) id 6472A4021787F; Mon, 4 Mar 2024 10:46:34 -0300 (-03) Date: Mon, 4 Mar 2024 10:46:34 -0300 From: Marcelo Tosatti To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Willem de Bruijn , Jakub Kicinski , Eric Dumazet , Frederic Weisbecker , Valentin Schneider , Paolo Abeni Subject: [PATCH net-next -v3] net/core/dev.c: enable timestamp static key if CPU isolation is configured Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For systems that use CPU isolation (via nohz_full), creating or destroying a socket with timestamping (SOCK_TIMESTAMPING_RX_SOFTWARE) might cause a static key to be enabled/disabled. This in turn causes undesired IPIs to isolated CPUs. So enable the static key unconditionally, if CPU isolation is enabled, thus avoiding the IPIs. Signed-off-by: Marcelo Tosatti --- = =20 v2: mention SOF_TIMESTAMPING_OPT_TX_SWHW in the commit log (Willem de Bruij= n / Paolo Abeni) v3: SOF_TIMESTAMPING_OPT_TX_SWHW is irrelevant (Willem de Bruijn) diff --git a/net/core/dev.c b/net/core/dev.c index c588808be77f..15a32f5900e6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -155,6 +155,7 @@ #include #include #include +#include =20 #include "dev.h" #include "net-sysfs.h" @@ -11851,3 +11852,14 @@ static int __init net_dev_init(void) } =20 subsys_initcall(net_dev_init); + +static int __init net_dev_late_init(void) +{ + /* avoid static key IPIs to isolated CPUs */ + if (housekeeping_enabled(HK_TYPE_MISC)) + net_enable_timestamp(); + + return 0; +} + +late_initcall(net_dev_late_init);