linux-kernel - Re: [PATCH 2/7] tty: core: Add tty_debug() for printk(KERN

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Message-ID: <55A33DC1.9030505@hurleysoftware.com>
Date:	Mon, 13 Jul 2015 00:25:37 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Joe Perches <joe@...ches.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/7] tty: core: Add tty_debug() for printk(KERN_DEBUG)
 messages

On 07/12/2015 11:47 PM, Joe Perches wrote:
> On Sun, 2015-07-12 at 22:49 -0400, Peter Hurley wrote:
>> Introduce tty_debug() macro to output uniform debug information for
>> tty core debug messages (function name and tty name).
> []
>> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
> []
>> @@ -768,7 +768,7 @@ static void do_tty_hangup(struct work_struct *work)
>>  void tty_hangup(struct tty_struct *tty)
>>  {
>>  #ifdef TTY_DEBUG_HANGUP
>> -	printk(KERN_DEBUG "%s hangup...\n", tty_name(tty));
>> +	tty_debug(tty, "\n");
> 
> Why drop the "hangup..." ?

tty_debug() prints the function name; in this case, tty_hangup().


>> diff --git a/include/linux/tty.h b/include/linux/tty.h
> []
>> +#define tty_debug(tty, f, args...)					\
>> +	do {								\
>> +		printk(KERN_DEBUG "%s: %s: " f, __func__,		\
>> +		       tty_name(tty), ##args);				\
>> +	} while (0)
> 
> Single statement macros don't need do {} while (0)

Ah, yep. Old hold-over from when tty_name() needed a temp buffer.


> #define fmt, ... 
> using fmt, ##__VA_ARGS__
> 
> is more common.

Ok.

Regards,
Peter Hurley
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