linux-kernel - Re: [PATCH 2/4] thermal_sys: Remove obfuscating used-once macros

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Date:	Thu, 26 Jan 2012 15:31:49 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Len Brown <len.brown@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] thermal_sys: Remove obfuscating used-once macros

On Tue, 24 Jan 2012 15:35:36 -0800
Joe Perches <joe@...ches.com> wrote:

> These don't add any value as they are used
> only once and the surrounding code uses similar
> variable.

And they were buggy if passed an expression-with-side-effects.  Geeze
we make this mistake often, and it's C programming 101!  Or maybe 102.

> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -312,22 +312,6 @@ static struct device_attribute trip_point_attrs[] = {
>  	__ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
>  };
>  
> -#define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
> -do {    \
> -	result = device_create_file(_dev,	\
> -				&trip_point_attrs[_index * 2]);	\
> -	if (result)	\
> -		break;	\
> -	result = device_create_file(_dev,	\
> -			&trip_point_attrs[_index * 2 + 1]);	\
> -} while (0)
> -
> -#define TRIP_POINT_ATTR_REMOVE(_dev, _index)	\
> -do {	\
> -	device_remove_file(_dev, &trip_point_attrs[_index * 2]);	\
> -	device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);	\
> -} while (0)

I don't forsee many tears being shed over the above ;)

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