linux-kernel - Re: [PATCH 1/4] kernel.h: Implement DIV_ROUND_CLOSEST

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Message-ID: <20150323123404.GC17049@unpythonic.net>
Date:	Mon, 23 Mar 2015 07:34:04 -0500
From:	Jeff Epler <jepler@...ythonic.net>
To:	Javi Merino <javi.merino@....com>
Cc:	akpm@...ux-foundation.org, intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	"Darrick J. Wong" <djwong@...ibm.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 1/4] kernel.h: Implement DIV_ROUND_CLOSEST_ULL

On Fri, Mar 20, 2015 at 11:14:40AM +0000, Javi Merino wrote:
> +/*
> + * Same as above but for u64 dividends.  divisor must be a 32-bit
> + * number.
> + */
> +#define DIV_ROUND_CLOSEST_ULL(x, divisor)(		\
> +{							\
> +	unsigned long long _tmp = (x) + (divisor) / 2;	\
> +	do_div(_tmp, divisor);				\
> +	_tmp;						\
> +}							\
> +)

The macro evaluates 'divisor' twice.

Jeff
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