linux-kernel - Re: [PATCH 01/14] tty: Improve tty

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Message-ID: <1447008694.2701.28.camel@perches.com>
Date:	Sun, 08 Nov 2015 10:51:34 -0800
From:	Joe Perches <joe@...ches.com>
To:	Peter Hurley <peter@...leysoftware.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/14] tty: Improve tty_debug() macro

On Sun, 2015-11-08 at 13:01 -0500, Peter Hurley wrote:
> Incorporate suggestions for tty core debug macro improvements
>  - printk(KERN_DEBUG) => pr_debug()
>  - ##args => ##__VA_ARGS__
>  - remove do {} while()
>  - output tty_name() first
[]
> diff --git a/include/linux/tty.h b/include/linux/tty.h
[]
> @@ -667,10 +667,7 @@ static inline void proc_tty_register_driver(struct tty_driver *d) {}
>  static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
>  #endif
>  
> -#define tty_debug(tty, f, args...)					\
> -	do {								\
> -		printk(KERN_DEBUG "%s: %s: " f, __func__,		\
> -		       tty_name(tty), ##args);				\
> -	} while (0)
> +#define tty_debug(tty, f, ...) \
> +	pr_debug("%s: %s: " f, tty_name(tty), __func__, ##__VA_ARGS__)
>  
>  #endif

Unless there's a #define DEBUG in the path, this now
basically requires dynamic debugging to output anything.

Given that, I suggest removing __func__ from the output
because dynamic debugging can add it.

And f is more commonly fmt, so:

#define tty_debug(tty, fmt, ...)					\
	pr_debug("%s: " fmt, tty_name(tty), ##__VA_ARGS__)


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