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Message-Id: <20220407125006.947300-1-alexandr.lobakin@intel.com>
Date: Thu, 7 Apr 2022 14:50:06 +0200
From: Alexander Lobakin <alexandr.lobakin@...el.com>
To: xiangxia.m.yue@...il.com
Cc: Alexander Lobakin <alexandr.lobakin@...el.com>,
netdev@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
Kees Cook <keescook@...omium.org>,
Iurii Zaikin <yzaikin@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
David Ahern <dsahern@...nel.org>,
Simon Horman <horms@...ge.net.au>,
Julian Anastasov <ja@....bg>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
Dmitry Vyukov <dvyukov@...gle.com>,
Alexei Starovoitov <ast@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
Lorenz Bauer <lmb@...udflare.com>,
Akhmat Karakotov <hmukos@...dex-team.ru>
Subject: Re: [net-next RESEND v2] net: core: use shared sysctl macro
From: xiangxia.m.yue@...il.com
Date: Wed, 6 Apr 2022 20:42:08 +0800
> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
>
> This patch introdues the SYSCTL_THREE, and replace the
> two, three and long_one to SYSCTL_XXX accordingly.
>
> KUnit:
> [23:03:58] ================ sysctl_test (10 subtests) =================
> [23:03:58] [PASSED] sysctl_test_api_dointvec_null_tbl_data
> [23:03:58] [PASSED] sysctl_test_api_dointvec_table_maxlen_unset
> [23:03:58] [PASSED] sysctl_test_api_dointvec_table_len_is_zero
> [23:03:58] [PASSED] sysctl_test_api_dointvec_table_read_but_position_set
> [23:03:58] [PASSED] sysctl_test_dointvec_read_happy_single_positive
> [23:03:58] [PASSED] sysctl_test_dointvec_read_happy_single_negative
> [23:03:58] [PASSED] sysctl_test_dointvec_write_happy_single_positive
> [23:03:58] [PASSED] sysctl_test_dointvec_write_happy_single_negative
> [23:03:58] [PASSED] sysctl_test_api_dointvec_write_single_less_int_min
> [23:03:58] [PASSED] sysctl_test_api_dointvec_write_single_greater_int_max
> [23:03:58] =================== [PASSED] sysctl_test ===================
>
> ./run_kselftest.sh -c sysctl
> ...
--- 8< ---
> diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
> index 7d9cfc730bd4..0bdd9249666b 100644
> --- a/fs/proc/proc_sysctl.c
> +++ b/fs/proc/proc_sysctl.c
> @@ -26,7 +26,7 @@ static const struct file_operations proc_sys_dir_file_operations;
> static const struct inode_operations proc_sys_dir_operations;
>
> /* shared constants to be used in various sysctls */
> -const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
> +const int sysctl_vals[] = { -1, 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
> EXPORT_SYMBOL(sysctl_vals);
>
> const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
> diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
> index 6353d6db69b2..b2ac6542455f 100644
> --- a/include/linux/sysctl.h
> +++ b/include/linux/sysctl.h
> @@ -42,12 +42,13 @@ struct ctl_dir;
> #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_TWO_HUNDRED ((void *)&sysctl_vals[6])
> -#define SYSCTL_ONE_THOUSAND ((void *)&sysctl_vals[7])
> -#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[8])
> -#define SYSCTL_INT_MAX ((void *)&sysctl_vals[9])
> +#define SYSCTL_THREE ((void *)&sysctl_vals[4])
> +#define SYSCTL_FOUR ((void *)&sysctl_vals[5])
> +#define SYSCTL_ONE_HUNDRED ((void *)&sysctl_vals[6])
> +#define SYSCTL_TWO_HUNDRED ((void *)&sysctl_vals[7])
> +#define SYSCTL_ONE_THOUSAND ((void *)&sysctl_vals[8])
> +#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[9])
> +#define SYSCTL_INT_MAX ((void *)&sysctl_vals[10])
>
> /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
> #define SYSCTL_MAXOLDUID ((void *)&sysctl_vals[10])
You forgot to change this one. It should point to 65535, i.e.
&sysctl_vals[11] from your adjusted array.
Maybe it's better to add new constants simply to the tail of the
array? To not adjust it each time and give a room for mistakes.
> diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
> index 7123fe7feeac..6ea51c155860 100644
> --- a/net/core/sysctl_net_core.c
> +++ b/net/core/sysctl_net_core.c
--- 8< ---
> --
> 2.27.0
Thanks,
Al
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