netdev - Re: [PATCH tty-next 15/22] isdn: tty: Use private flag for ASYNC

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Message-ID: <539F5B28.9080000@hurleysoftware.com>
Date:	Mon, 16 Jun 2014 17:01:28 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	David Laight <David.Laight@...LAB.COM>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Karsten Keil <isdn@...ux-pingi.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH tty-next 15/22] isdn: tty: Use private flag for ASYNC_CLOSING

Hi David,

On 06/16/2014 11:37 AM, David Laight wrote:
> From: Of Peter Hurley
>> ASYNC_CLOSING is no longer used in the tty core; use private flag
>> info->closing as substitute.
> ...
>> @@ -311,6 +311,7 @@ typedef struct atemu {
>>   typedef struct modem_info {
>>     int			magic;
>>     struct tty_port	port;
>> +  int			closing:1;	 /* port count has dropped to 0    */
>>     int			x_char;		 /* xon/xoff character             */
>>     int			mcr;		 /* Modem control register         */
>>     int                   msr;             /* Modem status register          */
>
> That should probably be a bool and set to true/false.
> You are probably adding a load of padding.

struct modem_info is over 1K, with several existing int-as-bool fields.
An array of 64 struct modem_info are statically allocated with every isdn device.

It doesn't look like memory consumption has been a consideration with the isdn driver.

Regards,
Peter Hurley
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