From patchwork Fri Apr 26 10:46:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Granados via B4 Relay X-Patchwork-Id: 13644581 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 3570E143895; Fri, 26 Apr 2024 10:47:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714128431; cv=none; b=dwRN8sHXMEd5RODT3RADrC6EEcOkhE1p5Bis8lt/dwuQiSrqZHJjx0p/mo0uURorPv0aNXEKPiWzYMS0wvxp1Ukw6oZzHPPeKG99UKWhOq9TVyZDLl9zperIeyL+4JR09fDur+7cPEqpIGx+mm6MOu5hJFSrNV9UcP50/a4Raa4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714128431; c=relaxed/simple; bh=YZ6DEJBVvljVIbhNU6e6jwmBQyGXRRuf7Jp8FhA0VRU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=nIamcDFcrslPr4+iW6/71K4tc4r8kxacmB/OteC/PYwZSSFOrNukXDz8FyMuJfubjlRzjhZqpmAfvXftv/CCvdonD85h8y10bdoaSHun6uBvunShICVhN0YnZzJF/aQv1bT36X7Pk995YBcHQMb7aO6eArxYXyMveL8h2TOYMFA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=T8JiRZCa; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="T8JiRZCa" Received: by smtp.kernel.org (Postfix) with ESMTPS id B82EDC2BD10; Fri, 26 Apr 2024 10:47:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714128430; bh=YZ6DEJBVvljVIbhNU6e6jwmBQyGXRRuf7Jp8FhA0VRU=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=T8JiRZCa4arq/VkQcgTiBvoe/Spc0SWBJnylxt8VtpSTnb2gJng8rRiToXnF7QSuF PbgvJO3BFs+9NxpzBtHj+k8IXw7XoBlbFeV9CsU1mdqQeimyPt3lrwumvOSaofJSaJ 59rVk3/EwhPw8UFsjRI6jh5GwbphzqN6dEkkFVqmtZWQdVrr97VJSStNGf8FMuwKbP eCUegbDYk9eZpy/SCAd8MG4WSJD/S1a87f5AyeNzB6SSwY56YLxmMohjxIF9XjFZHF bvhqb2hmLgoVSCFhoJxcoh+tN/ldNVAZvZRMmNsuiYkMbzQWNf1wSV+fCAg0U1ocgY amFR/fM0AEgaA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DD2AC4345F; Fri, 26 Apr 2024 10:47:10 +0000 (UTC) From: Joel Granados via B4 Relay Date: Fri, 26 Apr 2024 12:46:53 +0200 Subject: [PATCH v5 1/8] net: Remove the now superfluous sentinel elements from ctl_table array Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240426-jag-sysctl_remset_net-v5-1-e3b12f6111a6@samsung.com> References: <20240426-jag-sysctl_remset_net-v5-0-e3b12f6111a6@samsung.com> In-Reply-To: <20240426-jag-sysctl_remset_net-v5-0-e3b12f6111a6@samsung.com> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexander Aring , Stefan Schmidt , Miquel Raynal , David Ahern , Steffen Klassert , Herbert Xu , Matthieu Baerts , Mat Martineau , Geliang Tang , Ralf Baechle , Remi Denis-Courmont , Allison Henderson , David Howells , Marc Dionne , Marcelo Ricardo Leitner , Xin Long , Wenjia Zhang , Jan Karcher , "D. 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bh=iqBR4LN8wpuw1ds7vI8wqz00riFw9zUncKTSa21CztI=; b=owJ4nAHtARL+kA0DAAoBupfNUreWQU8ByyZiAGYrhihA6lMt+IAZ1Mm8dT7Ou8OAph0dvGtFh pJex2IuQsax+IkBswQAAQoAHRYhBK5HCVcl5jElzssnkLqXzVK3lkFPBQJmK4YoAAoJELqXzVK3 lkFP7wIMAJa8lbxTgRDJ6jIF2RLjX7z5smkai666wiltJ9MXTnHT75POTUCiiMiBsUuJfp4KJWh vTC7HR7qN5kfB1B/XiGzBT8VN/2YOrMZVWgGz3OAV/FNBrTxGfYoMM8/jXsizIQE+EWiYNiiZmi zmq+cCCls+eKCeHCO+MdYMJZtq3ZpYtoF8HlFwJJIrhtv37yunQjG/VqNiTZrGuEfVmXt+p0McG t6lp7g5wBKED690nQXBMcuTz9SwQyXSFY5ZujN3tkeXkWi3rxzeokVIoCBBrHwS3WAk8NYb+xAo zD2fzVCt9HlDTFeTC18v0ULtC96d1JXKsvlHBw+BWZ8ncvKunAKZRwXNhtZ3NesVp6jdgt7G1EH 0As94n/KLfgoREwqop7/pGTMupRDi5UXyHE0UsyOHcBkA3fN0eoFvXVsBMLPkisan4HOD6Zpgg+ XEakBqHw5rWn2OKDt2R85wWwLhKFV/o255lEU7PLhSr6rFe17+MuOJUj3e/JsKg/9Mq4lI4maS5 Yc= X-Developer-Key: i=j.granados@samsung.com; a=openpgp; fpr=F1F8E46D30F0F6C4A45FF4465895FAAC338C6E77 X-Endpoint-Received: by B4 Relay for j.granados@samsung.com/default with auth_id=70 X-Original-From: Joel Granados Reply-To: j.granados@samsung.com From: Joel Granados This commit comes at the tail end of a greater effort to remove the empty elements at the end of the ctl_table arrays (sentinels) which will reduce the overall build time size of the kernel and run time memory bloat by ~64 bytes per sentinel (further information Link : https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/) * Remove sentinel element from ctl_table structs. * Remove the zeroing out of an array element (to make it look like a sentinel) in neigh_sysctl_register and lowpan_frags_ns_sysctl_register This is not longer needed and is safe after commit c899710fe7f9 ("networking: Update to register_net_sysctl_sz") added the array size to the ctl_table registration. * Replace the for loop stop condition in sysctl_core_net_init that tests for procname == NULL with one that depends on array size * Removed the "-1" in mpls_net_init that adjusted for having an extra empty element when looping over ctl_table arrays * Use a table_size variable to keep the value of ARRAY_SIZE Signed-off-by: Joel Granados --- net/core/neighbour.c | 5 +---- net/core/sysctl_net_core.c | 12 +++++------- net/dccp/sysctl.c | 2 -- net/ieee802154/6lowpan/reassembly.c | 6 +----- net/mpls/af_mpls.c | 12 ++++++------ net/unix/sysctl_net_unix.c | 1 - 6 files changed, 13 insertions(+), 25 deletions(-) diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 552719c3bbc3..b0327402b3e6 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -3728,7 +3728,7 @@ static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, static struct neigh_sysctl_table { struct ctl_table_header *sysctl_header; - struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; + struct ctl_table neigh_vars[NEIGH_VAR_MAX]; } neigh_sysctl_template __read_mostly = { .neigh_vars = { NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), @@ -3779,7 +3779,6 @@ static struct neigh_sysctl_table { .extra2 = SYSCTL_INT_MAX, .proc_handler = proc_dointvec_minmax, }, - {}, }, }; @@ -3807,8 +3806,6 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, if (dev) { dev_name_source = dev->name; /* Terminate the table early */ - memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, - sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); neigh_vars_size = NEIGH_VAR_BASE_REACHABLE_TIME_MS + 1; } else { struct neigh_table *tbl = p->tbl; diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c index 6973dda3abda..a84690b13bb9 100644 --- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c @@ -660,7 +660,6 @@ static struct ctl_table net_core_table[] = { .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, }, - { } }; static struct ctl_table netns_core_table[] = { @@ -697,7 +696,6 @@ static struct ctl_table netns_core_table[] = { .extra2 = SYSCTL_ONE, .proc_handler = proc_dou8vec_minmax, }, - { } }; static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str) @@ -715,7 +713,8 @@ __setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup); static __net_init int sysctl_core_net_init(struct net *net) { - struct ctl_table *tbl, *tmp; + size_t table_size = ARRAY_SIZE(netns_core_table); + struct ctl_table *tbl; tbl = netns_core_table; if (!net_eq(net, &init_net)) { @@ -723,12 +722,11 @@ static __net_init int sysctl_core_net_init(struct net *net) if (tbl == NULL) goto err_dup; - for (tmp = tbl; tmp->procname; tmp++) - tmp->data += (char *)net - (char *)&init_net; + for (int i = 0; i < table_size; ++i) + (tbl + i)->data += (char *)net - (char *)&init_net; } - net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl, - ARRAY_SIZE(netns_core_table)); + net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl, table_size); if (net->core.sysctl_hdr == NULL) goto err_reg; diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c index ee8d4f5afa72..3fc474d6e57d 100644 --- a/net/dccp/sysctl.c +++ b/net/dccp/sysctl.c @@ -90,8 +90,6 @@ static struct ctl_table dccp_default_table[] = { .mode = 0644, .proc_handler = proc_dointvec_ms_jiffies, }, - - { } }; static struct ctl_table_header *dccp_table_header; diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c index 6dd960ec558c..09b18ee6df00 100644 --- a/net/ieee802154/6lowpan/reassembly.c +++ b/net/ieee802154/6lowpan/reassembly.c @@ -338,7 +338,6 @@ static struct ctl_table lowpan_frags_ns_ctl_table[] = { .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, - { } }; /* secret interval has been deprecated */ @@ -351,7 +350,6 @@ static struct ctl_table lowpan_frags_ctl_table[] = { .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, - { } }; static int __net_init lowpan_frags_ns_sysctl_register(struct net *net) @@ -370,10 +368,8 @@ static int __net_init lowpan_frags_ns_sysctl_register(struct net *net) goto err_alloc; /* Don't export sysctls to unprivileged users */ - if (net->user_ns != &init_user_ns) { - table[0].procname = NULL; + if (net->user_ns != &init_user_ns) table_size = 0; - } } table[0].data = &ieee802154_lowpan->fqdir->high_thresh; diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 6dab883a08dd..ecc849678e7b 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -1393,13 +1393,13 @@ static const struct ctl_table mpls_dev_table[] = { .proc_handler = mpls_conf_proc, .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), }, - { } }; static int mpls_dev_sysctl_register(struct net_device *dev, struct mpls_dev *mdev) { char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; + size_t table_size = ARRAY_SIZE(mpls_dev_table); struct net *net = dev_net(dev); struct ctl_table *table; int i; @@ -1411,7 +1411,7 @@ static int mpls_dev_sysctl_register(struct net_device *dev, /* Table data contains only offsets relative to the base of * the mdev at this point, so make them absolute. */ - for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { + for (i = 0; i < table_size; i++) { table[i].data = (char *)mdev + (uintptr_t)table[i].data; table[i].extra1 = mdev; table[i].extra2 = net; @@ -1419,8 +1419,7 @@ static int mpls_dev_sysctl_register(struct net_device *dev, snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); - mdev->sysctl = register_net_sysctl_sz(net, path, table, - ARRAY_SIZE(mpls_dev_table)); + mdev->sysctl = register_net_sysctl_sz(net, path, table, table_size); if (!mdev->sysctl) goto free; @@ -2674,6 +2673,7 @@ static const struct ctl_table mpls_table[] = { static int mpls_net_init(struct net *net) { + size_t table_size = ARRAY_SIZE(mpls_table); struct ctl_table *table; int i; @@ -2689,11 +2689,11 @@ static int mpls_net_init(struct net *net) /* Table data contains only offsets relative to the base of * the mdev at this point, so make them absolute. */ - for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) + for (i = 0; i < table_size; i++) table[i].data = (char *)net + (uintptr_t)table[i].data; net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table, - ARRAY_SIZE(mpls_table)); + table_size); if (net->mpls.ctl == NULL) { kfree(table); return -ENOMEM; diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c index 3e84b31c355a..ae45d4cfac39 100644 --- a/net/unix/sysctl_net_unix.c +++ b/net/unix/sysctl_net_unix.c @@ -19,7 +19,6 @@ static struct ctl_table unix_table[] = { .mode = 0644, .proc_handler = proc_dointvec }, - { } }; int __net_init unix_sysctl_register(struct net *net)