{"id":2175244,"url":"http://patchwork.ozlabs.org/api/1.0/covers/2175244/?format=json","project":{"id":26,"url":"http://patchwork.ozlabs.org/api/1.0/projects/26/?format=json","name":"Netfilter Development","link_name":"netfilter-devel","list_id":"netfilter-devel.vger.kernel.org","list_email":"netfilter-devel@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20251217162744.352391-1-mkoutny@suse.com>","date":"2025-12-17T16:27:32","name":"[0/4] Use __counted_by for ancestor arrays","submitter":{"id":74126,"url":"http://patchwork.ozlabs.org/api/1.0/people/74126/?format=json","name":"Michal Koutný","email":"mkoutny@suse.com"},"series":[{"id":485721,"url":"http://patchwork.ozlabs.org/api/1.0/series/485721/?format=json","date":"2025-12-17T16:27:32","name":"Use __counted_by for ancestor arrays","version":1,"mbox":"http://patchwork.ozlabs.org/series/485721/mbox/"}],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","netfilter-devel@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=suse.com header.i=@suse.com header.a=rsa-sha256\n header.s=google header.b=UbGQDrg+;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; helo=sto.lore.kernel.org;\n envelope-from=netfilter-devel+bounces-10145-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com\n header.b=\"UbGQDrg+\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.128.52","smtp.subspace.kernel.org;\n dmarc=pass (p=quarantine dis=none) header.from=suse.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=suse.com"],"Received":["from sto.lore.kernel.org (sto.lore.kernel.org\n [IPv6:2600:3c09:e001:a7::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4dWfRD26z9z1xty\n\tfor ; Thu, 18 Dec 2025 03:30:16 +1100 (AEDT)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sto.lore.kernel.org (Postfix) with ESMTP id 2D37C302CBAF\n\tfor ; Wed, 17 Dec 2025 16:30:13 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 010BE355038;\n\tWed, 17 Dec 2025 16:28:04 +0000 (UTC)","from mail-wm1-f52.google.com (mail-wm1-f52.google.com\n [209.85.128.52])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id EC85D34D4C1\n\tfor ; Wed, 17 Dec 2025 16:28:00 +0000 (UTC)","by mail-wm1-f52.google.com with SMTP id\n 5b1f17b1804b1-47789cd2083so32819815e9.2\n for ;\n Wed, 17 Dec 2025 08:28:00 -0800 (PST)","from blackdock.suse.cz (nat2.prg.suse.com. 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Miller\" ,\n Simon Horman , John Fastabend ,\n Johannes Weiner , Daniel Borkmann ,\n Andrii Nakryiko , Tejun Heo ,\n Josef Bacik , Paolo Abeni ,\n \"Gustavo A. R. Silva\" ,\n Pablo Neira Ayuso ,\n Eduard Zingerman , Yu Kuai ,\n Masami Hiramatsu , Kees Cook ,\n Jakub Kicinski ","Subject":"[PATCH 0/4] Use __counted_by for ancestor arrays","Date":"Wed, 17 Dec 2025 17:27:32 +0100","Message-ID":"<20251217162744.352391-1-mkoutny@suse.com>","X-Mailer":"git-send-email 2.52.0","Precedence":"bulk","X-Mailing-List":"netfilter-devel@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"8bit"},"content":"The trick with utilizing space in cgroup_root for cgroup::ancetors flex\narray was an obstacle for kernel reworks for\n-Wflex-array-member-not-at-end.\n\nThe first patch fixes that, then I wanted to utilize __counted_by for\nthis flex array which required some more rework how cgroup level is\nevaluated.\n\nSimilar flex array is also in struct ioc_gq where it was tempting to\nsimply use __counted_by(level), however, this would be off-by-one as it\nhas semantics like cgroup's level (0 == root).\nProper adjustment for __counted_by() would either need similar\nlevel/ancestor helpers or abstracted macros for ancestors up/down\niterations.\n\nI only made a simple comment fixup since I'm not sure about benefit of\n__counted_by for structs that aren't sized based on direct user input.\n\nMichal Koutný (4):\n cgroup: Eliminate cgrp_ancestor_storage in cgroup_root\n cgroup: Introduce cgroup_level() helper\n cgroup: Use __counted_by for cgroup::ancestors\n blk-iocost: Correct comment ioc_gq::level\n\n block/bfq-iosched.c | 2 +-\n block/blk-iocost.c | 6 ++---\n include/linux/cgroup-defs.h | 43 +++++++++++++++++++----------------\n include/linux/cgroup.h | 18 ++++++++++++---\n include/trace/events/cgroup.h | 8 +++----\n kernel/bpf/helpers.c | 2 +-\n kernel/cgroup/cgroup.c | 9 ++++----\n net/netfilter/nft_socket.c | 2 +-\n 8 files changed, 53 insertions(+), 37 deletions(-)\n\n\nbase-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8"}