linux-kernel - Re: [PATCH v4 2/5] documentation: update CodingStyle on local variables naming in macros

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Date:	Thu, 19 Mar 2015 16:22:35 -0700
From:	Joe Perches <joe@...ches.com>
To:	Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Guenter Roeck <linux@...ck-us.net>,
	lm-sensors <lm-sensors@...sensors.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v4 2/5] documentation: update CodingStyle on local
 variables naming in macros

On Thu, 2015-03-19 at 18:27 +0100, Bartosz Golaszewski wrote:
> Describe proper naming convention for local variables in macros
> resembling functions.
[]
> diff --git a/Documentation/CodingStyle b/Documentation/CodingStyle
[]

> +5) namespace collisions when defining local variables in macros resembling
> +functions:
> +
> +#define FOO(x)				\
> +({					\
> +	typeof(x) ret;			\
> +	ret = calc_ret(x);		\
> +	(ret);				\

trivia: ret wouldn't need parentheses here.

> +)}
> +
> +ret is a common name for a local variable - __foo_ret is less likely
> +to collide with an existing variable.

Is shadowing really much of a problem here?

These are statement expression macros and names
have local scope anyway.

It's similar to function arguments using the same
names as parameters.


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