From patchwork Sat May 16 08:55:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nixiaoming X-Patchwork-Id: 11553409 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1B36590 for ; Sat, 16 May 2020 08:55:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 083AB207D3 for ; Sat, 16 May 2020 08:55:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727014AbgEPIzo (ORCPT ); Sat, 16 May 2020 04:55:44 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:4851 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725997AbgEPIz3 (ORCPT ); Sat, 16 May 2020 04:55:29 -0400 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 9DFCE47CD4781515226C; Sat, 16 May 2020 16:55:25 +0800 (CST) Received: from use12-sp2.huawei.com (10.67.189.174) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.487.0; Sat, 16 May 2020 16:55:18 +0800 From: Xiaoming Ni To: , , , , , , , , , , , , CC: , , , Subject: [PATCH v2 2/4] sysctl: Move some boundary constants form sysctl.c to sysctl_vals Date: Sat, 16 May 2020 16:55:13 +0800 Message-ID: <1589619315-65827-3-git-send-email-nixiaoming@huawei.com> X-Mailer: git-send-email 1.8.5.6 In-Reply-To: <1589619315-65827-1-git-send-email-nixiaoming@huawei.com> References: <1589619315-65827-1-git-send-email-nixiaoming@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.189.174] X-CFilter-Loop: Reflected Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Some boundary (.extra1 .extra2) constants (E.g: neg_one two) in sysctl.c are used in multiple features. Move these variables to sysctl_vals to avoid adding duplicate variables when cleaning up sysctls table. Signed-off-by: Xiaoming Ni Reviewed-by: Kees Cook --- fs/proc/proc_sysctl.c | 2 +- include/linux/sysctl.h | 11 ++++++++--- kernel/sysctl.c | 37 ++++++++++++++++--------------------- 3 files changed, 25 insertions(+), 25 deletions(-) diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index b6f5d45..3f77e64 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -23,7 +23,7 @@ static const struct inode_operations proc_sys_dir_operations; /* shared constants to be used in various sysctls */ -const int sysctl_vals[] = { 0, 1, INT_MAX }; +const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 1000, INT_MAX }; EXPORT_SYMBOL(sysctl_vals); /* Support for permanently empty directories */ diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index 43f8ef9..bf97c30 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -38,9 +38,14 @@ struct ctl_dir; /* Keep the same order as in fs/proc/proc_sysctl.c */ -#define SYSCTL_ZERO ((void *)&sysctl_vals[0]) -#define SYSCTL_ONE ((void *)&sysctl_vals[1]) -#define SYSCTL_INT_MAX ((void *)&sysctl_vals[2]) +#define SYSCTL_NEG_ONE ((void *)&sysctl_vals[0]) +#define SYSCTL_ZERO ((void *)&sysctl_vals[1]) +#define SYSCTL_ONE ((void *)&sysctl_vals[2]) +#define SYSCTL_TWO ((void *)&sysctl_vals[3]) +#define SYSCTL_FOUR ((void *)&sysctl_vals[4]) +#define SYSCTL_ONE_HUNDRED ((void *)&sysctl_vals[5]) +#define SYSCTL_ONE_THOUSAND ((void *)&sysctl_vals[6]) +#define SYSCTL_INT_MAX ((void *)&sysctl_vals[7]) extern const int sysctl_vals[]; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 20c31f5..5f08cc2 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -124,14 +124,9 @@ static int sixty = 60; #endif -static int __maybe_unused neg_one = -1; -static int __maybe_unused two = 2; -static int __maybe_unused four = 4; static unsigned long zero_ul; static unsigned long one_ul = 1; static unsigned long long_max = LONG_MAX; -static int one_hundred = 100; -static int one_thousand = 1000; #ifdef CONFIG_PRINTK static int ten_thousand = 10000; #endif @@ -547,7 +542,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, - .extra1 = &neg_one, + .extra1 = SYSCTL_NEG_ONE, .extra2 = SYSCTL_ONE, }, #endif @@ -878,7 +873,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = proc_dointvec_minmax_sysadmin, .extra1 = SYSCTL_ZERO, - .extra2 = &two, + .extra2 = SYSCTL_TWO, }, #endif { @@ -1189,7 +1184,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = perf_cpu_time_max_percent_handler, .extra1 = SYSCTL_ZERO, - .extra2 = &one_hundred, + .extra2 = SYSCTL_ONE_HUNDRED, }, { .procname = "perf_event_max_stack", @@ -1207,7 +1202,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = perf_event_max_stack_handler, .extra1 = SYSCTL_ZERO, - .extra2 = &one_thousand, + .extra2 = SYSCTL_ONE_THOUSAND, }, #endif { @@ -1282,7 +1277,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, - .extra2 = &two, + .extra2 = SYSCTL_TWO, }, { .procname = "panic_on_oom", @@ -1291,7 +1286,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, - .extra2 = &two, + .extra2 = SYSCTL_TWO, }, { .procname = "oom_kill_allocating_task", @@ -1336,7 +1331,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = dirty_background_ratio_handler, .extra1 = SYSCTL_ZERO, - .extra2 = &one_hundred, + .extra2 = SYSCTL_ONE_HUNDRED, }, { .procname = "dirty_background_bytes", @@ -1353,7 +1348,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = dirty_ratio_handler, .extra1 = SYSCTL_ZERO, - .extra2 = &one_hundred, + .extra2 = SYSCTL_ONE_HUNDRED, }, { .procname = "dirty_bytes", @@ -1393,7 +1388,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, - .extra2 = &one_hundred, + .extra2 = SYSCTL_ONE_HUNDRED, }, #ifdef CONFIG_HUGETLB_PAGE { @@ -1450,7 +1445,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0200, .proc_handler = drop_caches_sysctl_handler, .extra1 = SYSCTL_ONE, - .extra2 = &four, + .extra2 = SYSCTL_FOUR, }, #ifdef CONFIG_COMPACTION { @@ -1503,7 +1498,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = watermark_scale_factor_sysctl_handler, .extra1 = SYSCTL_ONE, - .extra2 = &one_thousand, + .extra2 = SYSCTL_ONE_THOUSAND, }, { .procname = "percpu_pagelist_fraction", @@ -1582,7 +1577,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, .extra1 = SYSCTL_ZERO, - .extra2 = &one_hundred, + .extra2 = SYSCTL_ONE_HUNDRED, }, { .procname = "min_slab_ratio", @@ -1591,7 +1586,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = sysctl_min_slab_ratio_sysctl_handler, .extra1 = SYSCTL_ZERO, - .extra2 = &one_hundred, + .extra2 = SYSCTL_ONE_HUNDRED, }, #endif #ifdef CONFIG_SMP @@ -1874,7 +1869,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0600, .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, - .extra2 = &two, + .extra2 = SYSCTL_TWO, }, { .procname = "protected_regular", @@ -1883,7 +1878,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0600, .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, - .extra2 = &two, + .extra2 = SYSCTL_TWO, }, { .procname = "suid_dumpable", @@ -1892,7 +1887,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .mode = 0644, .proc_handler = proc_dointvec_minmax_coredump, .extra1 = SYSCTL_ZERO, - .extra2 = &two, + .extra2 = SYSCTL_TWO, }, #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) {