linux-kernel - Re: [PATCH 5/7] sgi-xp: simplify sysctl registration

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Date:   Tue, 7 Mar 2023 16:24:10 -0600
From:   Steve Wahl <steve.wahl@....com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     ebiederm@...ssion.com, keescook@...omium.org, yzaikin@...gle.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, minyard@....org,
        kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, song@...nel.org, robinmholt@...il.com,
        steve.wahl@....com, arnd@...db.de, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, jgross@...e.com, sstabellini@...nel.org,
        oleksandr_tyshchenko@...m.com, xen-devel@...ts.xenproject.org,
        j.granados@...sung.com, zhangpeng362@...wei.com,
        tangmeng@...ontech.com, willy@...radead.org, nixiaoming@...wei.com,
        sujiaxun@...ontech.com, patches@...ts.linux.dev,
        linux-fsdevel@...r.kernel.org, apparmor@...ts.ubuntu.com,
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        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] sgi-xp: simplify sysctl registration

On Thu, Mar 02, 2023 at 12:46:10PM -0800, Luis Chamberlain wrote:
> Although this driver is a good use case for having a directory
> that is not other directories and then subdirectories with more
> entries, the usage of register_sysctl_table() can recurse and
> increases complexity so to avoid that just split out the
> registration to each directory with its own entries.
> 
> register_sysctl_table() is a deprecated compatibility wrapper.
> register_sysctl() can do the directory creation for you so just use
> that.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>

Reviewed-by: Steve Wahl <steve.wahl@....com>

> ---
>  drivers/misc/sgi-xp/xpc_main.c | 24 ++++++++++--------------
>  1 file changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/misc/sgi-xp/xpc_main.c b/drivers/misc/sgi-xp/xpc_main.c
> index b2c3c22fc13c..6da509d692bb 100644
> --- a/drivers/misc/sgi-xp/xpc_main.c
> +++ b/drivers/misc/sgi-xp/xpc_main.c
> @@ -93,7 +93,7 @@ int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT;
>  static int xpc_disengage_min_timelimit;	/* = 0 */
>  static int xpc_disengage_max_timelimit = 120;
>  
> -static struct ctl_table xpc_sys_xpc_hb_dir[] = {
> +static struct ctl_table xpc_sys_xpc_hb[] = {
>  	{
>  	 .procname = "hb_interval",
>  	 .data = &xpc_hb_interval,
> @@ -112,11 +112,7 @@ static struct ctl_table xpc_sys_xpc_hb_dir[] = {
>  	 .extra2 = &xpc_hb_check_max_interval},
>  	{}
>  };
> -static struct ctl_table xpc_sys_xpc_dir[] = {
> -	{
> -	 .procname = "hb",
> -	 .mode = 0555,
> -	 .child = xpc_sys_xpc_hb_dir},
> +static struct ctl_table xpc_sys_xpc[] = {
>  	{
>  	 .procname = "disengage_timelimit",
>  	 .data = &xpc_disengage_timelimit,
> @@ -127,14 +123,9 @@ static struct ctl_table xpc_sys_xpc_dir[] = {
>  	 .extra2 = &xpc_disengage_max_timelimit},
>  	{}
>  };
> -static struct ctl_table xpc_sys_dir[] = {
> -	{
> -	 .procname = "xpc",
> -	 .mode = 0555,
> -	 .child = xpc_sys_xpc_dir},
> -	{}
> -};
> +
>  static struct ctl_table_header *xpc_sysctl;
> +static struct ctl_table_header *xpc_sysctl_hb;
>  
>  /* non-zero if any remote partition disengage was timed out */
>  int xpc_disengage_timedout;
> @@ -1041,6 +1032,8 @@ xpc_do_exit(enum xp_retval reason)
>  
>  	if (xpc_sysctl)
>  		unregister_sysctl_table(xpc_sysctl);
> +	if (xpc_sysctl_hb)
> +		unregister_sysctl_table(xpc_sysctl_hb);
>  
>  	xpc_teardown_partitions();
>  
> @@ -1243,7 +1236,8 @@ xpc_init(void)
>  		goto out_1;
>  	}
>  
> -	xpc_sysctl = register_sysctl_table(xpc_sys_dir);
> +	xpc_sysctl = register_sysctl("xpc", xpc_sys_xpc);
> +	xpc_sysctl_hb = register_sysctl("xpc/hb", xpc_sys_xpc_hb);
>  
>  	/*
>  	 * Fill the partition reserved page with the information needed by
> @@ -1308,6 +1302,8 @@ xpc_init(void)
>  	(void)unregister_die_notifier(&xpc_die_notifier);
>  	(void)unregister_reboot_notifier(&xpc_reboot_notifier);
>  out_2:
> +	if (xpc_sysctl_hb)
> +		unregister_sysctl_table(xpc_sysctl_hb);
>  	if (xpc_sysctl)
>  		unregister_sysctl_table(xpc_sysctl);
>  
> -- 
> 2.39.1
> 

-- 
Steve Wahl, Hewlett Packard Enterprise