From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <nhorman@tuxdriver.com>
Received: from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58])
 by dpdk.org (Postfix) with ESMTP id 776102EDA
 for <dev@dpdk.org>; Sat, 27 Dec 2014 21:49:19 +0100 (CET)
Received: from [2001:470:8:a08:215:ff:fecc:4872] (helo=localhost)
 by smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63)
 (envelope-from <nhorman@tuxdriver.com>)
 id 1Y4yIL-0002rF-GR; Sat, 27 Dec 2014 15:49:18 -0500
Date: Sat, 27 Dec 2014 15:49:03 -0500
From: Neil Horman <nhorman@tuxdriver.com>
To: Ravi Kerur <rkerur@gmail.com>
Message-ID: <20141227204903.GB16138@localhost.localdomain>
References: <1419694115-1892-1-git-send-email-rkerur@gmail.com>
 <1419694244-2018-1-git-send-email-rkerur@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1419694244-2018-1-git-send-email-rkerur@gmail.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-Spam-Score: -2.9 (--)
X-Spam-Status: No
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2] Fix rte_is_power_of_2
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Sat, 27 Dec 2014 20:49:19 -0000

On Sat, Dec 27, 2014 at 10:30:44AM -0500, Ravi Kerur wrote:
> rte_is_power_of_2 returns true for 0 and 0 is not power_of_2. Fix
> by checking for n.
> 
> Signed-off-by: Ravi Kerur <rkerur@gmail.com>
> ---
>  lib/librte_eal/common/include/rte_common.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
> index 921b91f..8ac940c 100644
> --- a/lib/librte_eal/common/include/rte_common.h
> +++ b/lib/librte_eal/common/include/rte_common.h
> @@ -203,7 +203,7 @@ extern int RTE_BUILD_BUG_ON_detected_error;
>  static inline int
>  rte_is_power_of_2(uint32_t n)
>  {
> -	return ((n-1) & n) == 0;
> +	return n && !(n & (n - 1));
>  }
>  
>  /**
> -- 
> 1.9.1
> 
> 
Acked-by: Neil Horman <nhorman@tuxdriver.com>