linux-kernel - Re: [PATCH v3 1/4] util_macros.h: add find

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Date:	Thu, 19 Mar 2015 08:15:09 -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 <srostedt@...hat.com>
Subject: Re: [PATCH v3 1/4] util_macros.h: add find_closest() macro

On Thu, 2015-03-19 at 15:30 +0100, Bartosz Golaszewski wrote:
> Searching for the member of an array closest to 'x' is
> duplicated in several places.
[]
> diff --git a/include/linux/util_macros.h b/include/linux/util_macros.h
[]
> @@ -0,0 +1,39 @@
> +#ifndef _LINUX_HELPER_MACROS_H_
> +#define _LINUX_HELPER_MACROS_H_
> +
> +#define __find_closest(x, a, as, op)(					\
> +{									\
> +	typeof(as) _i, _as = (as) - 1;					\
> +	typeof(x) _x = (x);						\
> +	typeof(*a) *_a = (a);						\
> +	for (_i = 0; _i < _as; _i++) {					\
> +		if (_x op DIV_ROUND_CLOSEST(_a[_i] + _a[_i + 1], 2))	\
> +			break;						\
> +	}								\
> +	(_i);								\
> +})

Please use consistent statement expression start/top whitespace.

> +
> +/*

This should be /** for proper kernel-doc style

> + * find_closest - locate the closest element in a sorted array
> + * @x: The reference value.
> + * @a: The array in which to look for the closest element. Must be sorted
> + *  in ascending order.
> + * @as: Size of 'a'.
> + *
> + * Returns the index of the element closest to 'x'.
> + */
> +#define find_closest(x, a, as) __find_closest(x, a, as, <=)
> +
> +/*
> + * find_closest_descending - locate the closest element in a sorted array
> + * @x: The reference value.
> + * @a: The array in which to look for the closest element. Must be sorted
> + *  in descending order.
> + * @as: Size of 'a'.
> + *
> + * Similar to get_closest() but 'a' is expected to be sorted in descending
> + * order.
> + */
> +#define find_closest_descending(x, a, as) __find_closest(x, a, as, >)

Again, why is this > not >= ?



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