linux-kernel - Re: [PATCH 1/8] add lib/gcd.c

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Message-Id: <1244131044.3631.14.camel@Joe-Laptop.home>
Date:	Thu, 04 Jun 2009 08:57:24 -0700
From:	Joe Perches <joe@...ches.com>
To:	Florian Fainelli <florian@...nwrt.org>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Linux-MIPS <linux-mips@...ux-mips.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH 1/8] add lib/gcd.c

On Thu, 2009-06-04 at 16:39 +0200, Florian Fainelli wrote:
> diff --git a/lib/gcd.c b/lib/gcd.c
> new file mode 100644
> index 0000000..6634741
> --- /dev/null
> +++ b/lib/gcd.c
> @@ -0,0 +1,20 @@
> +#include <linux/gcd.h>
> +#include <linux/module.h>
> +
> +/* Greatest common divisor */
> +unsigned long gcd(unsigned long a, unsigned long b)
> +{
> +	unsigned long r;
> +
> +	if (a < b) {
> +		r = a;
> +		a = b;
> +		b = r;
	swap(a, b)
> +	}
> +	while ((r = a % b) != 0) {
> +		a = b;
> +		b = r;
> +	}
> +	return b;
> +}
> +EXPORT_SYMBOL_GPL(gcd);

Shouldn't a generic gcd protect against a div0
if gcd(0,0)?


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