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

[Steve Wahl <steve.wahl@xxxxxxx>]

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@xxxxxxxxxx>

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

> ---
>  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