linux-kernel - Re: [PATCH 04/15] tty: Remove now superfluous sentinel element from ctl

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Date:   Mon, 2 Oct 2023 08:47:53 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Jiri Slaby <jirislaby@...nel.org>,
        "j.granados@...sung.com" <j.granados@...sung.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        "willy@...radead.org" <willy@...radead.org>,
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        Kees Cook <keescook@...omium.org>,
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        Clemens Ladisch <clemens@...isch.de>,
        Arnd Bergmann <arnd@...db.de>,
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Subject: Re: [PATCH 04/15] tty: Remove now superfluous sentinel element from
 ctl_table array



Le 02/10/2023 à 10:17, Jiri Slaby a écrit :
> On 28. 09. 23, 15:21, Joel Granados via B4 Relay wrote:
>> From: Joel Granados <j.granados@...sung.com>
>>
>> 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 from tty_table
>>
>> Signed-off-by: Joel Granados <j.granados@...sung.com>
>> ---
>>   drivers/tty/tty_io.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
>> index 8a94e5a43c6d..2f925dc54a20 100644
>> --- a/drivers/tty/tty_io.c
>> +++ b/drivers/tty/tty_io.c
>> @@ -3607,8 +3607,7 @@ static struct ctl_table tty_table[] = {
>>           .proc_handler    = proc_dointvec,
>>           .extra1        = SYSCTL_ZERO,
>>           .extra2        = SYSCTL_ONE,
>> -    },
>> -    { }
>> +    }
> 
> Why to remove the comma? One would need to add one when adding a new entry?

Does it make any difference at all ?

In one case you have:

@xxxx
  		something old,
  	},
+	{
+		something new,
+	},
  }

In the other case you have:

@xxxx
  		something old,
+ 	},
+	{
+		something new,
  	}
  }


Christophe