From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f42.google.com (mail-qv1-f42.google.com [209.85.219.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1541E1DC9B3 for ; Fri, 23 Jan 2026 18:17:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769192260; cv=none; b=AbI9tyLXq4ocsNyFrVHJAqwczoG8oXeC7kNIGU5oWRWW1Bv1nUTo5KNXfgaoM3Sv2JveYiXf1CWEhmFkkAT8TeutADhT52FcyYrdeVoxLbR8aWvsZALOjiRrYOt+TeyfKVYZ1+NXa/w97tO2tCzkQv5zoXeVQ/98ajUPrGbBtzY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769192260; c=relaxed/simple; bh=HL9Z8exH0p8ghijOUjxjCoBmCDjBhhDKtkS3KASOoh0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=lQ342E7DeKGQrGr/Wj4pOENo6jx5+u8PHAPqKq2ofaybUQyeZcczyEkTQ+WPix17AKgSQwXslD1wIZN3iDd/Lbe3cHYmV9KBp6Ly08I5BgBYXW/J4luw7EmzlKDKScOk+3+wS9ZlsD1v41mYXZpbhV7b80fN6VewoFF61OjIaC4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=FXrcjsbL; arc=none smtp.client-ip=209.85.219.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="FXrcjsbL" Received: by mail-qv1-f42.google.com with SMTP id 6a1803df08f44-8946f12b1cfso33939196d6.0 for ; Fri, 23 Jan 2026 10:17:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769192258; x=1769797058; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=zF0a10J5mLJVO6RkpWuar6FLLd6MMCZJu1XiB3Hvb/Q=; b=FXrcjsbL3lQYWuDMkpdApVo0X3645CYccv6zcaSnCoXp6BBd/yDyTO+duKymbcsrZO GJPdfdjjk8m5aHmkQKLd3JYG6ILSG65D0tkhM1OFQAwUQ2GOrLsMOlnHjAIrjU/NiDF5 BCaHic6gTuhN9d+3TU5Uw9WOVBv9xcwhaXTh/lxVe1IT5YAPak2zMkVIljb5oaXrYE6o M3NEx7dKbdvR7YXl6EESGJzSgGid7CWahtKBZdrVeIArLCbiExGQgAhicWhNjM+QGlbR A1OtcUxOpqHrNAdL6+pH8nXO0MBpiUAndXULne4UlDy1srTLhyS6Ru4KH8gg2/+c7NFV wksg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769192258; x=1769797058; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=zF0a10J5mLJVO6RkpWuar6FLLd6MMCZJu1XiB3Hvb/Q=; b=dX3W7fXmweDcVXgVBSIIvOMOVT9yx21n8lh5wcVwvfpyFz/MCf7m2aVlFeg/dg1vwk pcfSRnu1lqmdU2Zj0CtcSiyp3KaY9IN2fYYcfKsRsNv4FvPv/5PRwrdel9lTiMfwtLsI vumvKyHyTkdNA+2g89zgW2wN9PE7Jhbk8oYFrdnRDHVHQCeOmwZQMjK22JVKpyIOgzqB hOZtknyotDcRFn1MEMKC+kk143W2oLN65YrrFpi20KH/ElBnSICzIeEpvlEjLy19RANo JtswpHZa/UjPVmObeE7opGwxErm5ym8lhJFcfaANa7h8/WXNVQaEjsWcIUkfzTK0hGOY nTAQ== X-Gm-Message-State: AOJu0Yx+lS0yJQDI/P9uaWgCEOslTZe58e5FQ6uxLhUCe7EW6FRApS8Y Q/nWcxhbdidfLaaLSvWMv7pOAzmrGfyB0GpLEqpH65w79VZ7P35yi2rSD9P4Pg== X-Gm-Gg: AZuq6aJ3ovK5Usm5tD3cQvGL6AG1EM2wxaxiSmd5Ljk8OPtmJIbiYiJx9RicJfF0ChF u30WBmD8HNZSZBC4TWRBpMRqniC84rh9rxtfeUm1zcGPXTJHAuqa2N5+mfG4ajANNkTy35pq58Q UntoFDRqcGFDRnrw7GcYeNIpox7ITc4uSz6B0ZZrdWigOGFPkWuBXbuSypzyxFpeFu9BhaEO5iN hiI9WS0ArCeh6X0iEa8tFtzz1WDHjRCqSqPfqZtwPu/c3C3JD/qkv+dtp5lqziKu4aRxa9o1V5w Di0WPjwbrcX4RUtF92kMlRCpbFOQd1Hn3eS0kjJoGrlBTvoC58P1oumZrv6y+FD+CkQ8DC5HXqD bUw+kUs5neyheO7x0J123vT2CPxP/QDaw8zuOQSlzica2ThM4usKGaz0Rj8G4sigc/zg2Ty/PIK vM6EtCP2xpe1uaWlb7byf6F9Le3FVPkgA69wDdqfleeo3aMUK7dVxxYw== X-Received: by 2002:a17:90b:17ca:b0:33b:cfac:d5c6 with SMTP id 98e67ed59e1d1-3537af9505emr1485005a91.29.1769185336053; Fri, 23 Jan 2026 08:22:16 -0800 (PST) Received: from d.home.mmyangfl.tk ([2001:19f0:8001:1644:5400:5ff:fe3e:12b1]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3536dc50882sm2496967a91.16.2026.01.23.08.22.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Jan 2026 08:22:15 -0800 (PST) From: David Yang To: netdev@vger.kernel.org Cc: David Yang , Sabrina Dubroca , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Nikolay Aleksandrov , Ido Schimmel , Simon Horman , Aaron Conole , Eelco Chaudron , Ilya Maximets , Shigeru Yoshida , Stanislav Fomichev , Breno Leitao , Carolina Jubran , Kuniyuki Iwashima , Guillaume Nault , linux-kernel@vger.kernel.org, bridge@lists.linux.dev, dev@openvswitch.org Subject: [PATCH net-next v2 0/7] u64_stats: Introduce u64_stats_reads() Date: Sat, 24 Jan 2026 00:21:32 +0800 Message-ID: <20260123162159.2877941-1-mmyangfl@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On 64bit arches, struct u64_stats_sync is empty and provides no help against load/store tearing. memcpy() and struct copying should not be considered tear-free. Use u64_stats_reads() instead. v1: https://lore.kernel.org/r/20260120092137.2161162-1-mmyangfl@gmail.com - rename to u64_stats_reads() to clarify data flow direction - refine the implementation - add docs - fix struct copying too David Yang (7): u64_stats: Introduce u64_stats_reads() u64_stats: Doc incorrect usage with plain variables net: bridge: mcast: fix memcpy with u64_stats net: openvswitch: fix load tearing with u64_stats macsec: fix memcpy with u64_stats mpls: Fix load tearing with u64_stats vxlan: vnifilter: fix memcpy with u64_stats drivers/net/macsec.c | 6 ++-- drivers/net/vxlan/vxlan_vnifilter.c | 2 +- include/linux/u64_stats_sync.h | 56 ++++++++++++++++++++++++----- net/bridge/br_multicast.c | 2 +- net/mpls/af_mpls.c | 2 +- net/openvswitch/datapath.c | 3 +- 6 files changed, 55 insertions(+), 16 deletions(-) -- 2.51.0