linux-kernel - Re: [PATCH]is_power_of

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Message-ID: <20070614175059.GA11508@rain>
Date:	Thu, 14 Jun 2007 21:50:59 +0400
From:	Evgeniy Dushistov <dushistov@...l.ru>
To:	vignesh babu <vignesh.babu@...ro.com>, akpm@...ux-foundation.org
Cc:	daniel.pirkl@...il.cz, linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Janitors List <kernel-janitors@...ts.osdl.org>
Subject: Re: [PATCH]is_power_of_2-ufs/super.c

On Thu, Jun 14, 2007 at 01:39:18PM +0530, vignesh babu wrote:
> 
> 
> Replacing (n & (n-1)) in the context of power of 2 checks
> with is_power_of_2
> 
> Signed-off-by: vignesh babu <vignesh.babu@...ro.com>

Acked-by: Evgeniy Dushistov <dushistov@...l.ru>

> --- 
> diff --git a/fs/ufs/super.c b/fs/ufs/super.c
> index 22ff6ed..2b30116 100644
> --- a/fs/ufs/super.c
> +++ b/fs/ufs/super.c
> @@ -87,6 +87,7 @@
>  #include <linux/smp_lock.h>
>  #include <linux/buffer_head.h>
>  #include <linux/vfs.h>
> +#include <linux/log2.h>
>  
>  #include "swab.h"
>  #include "util.h"
> @@ -854,7 +855,7 @@ magic_found:
>  	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
>  	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);
>  
> -	if (uspi->s_fsize & (uspi->s_fsize - 1)) {
> +	if (!is_power_of_2(uspi->s_fsize)) {
>  		printk(KERN_ERR "ufs_read_super: fragment size %u is not a power of 2\n",
>  			uspi->s_fsize);
>  			goto failed;
> @@ -869,7 +870,7 @@ magic_found:
>  			uspi->s_fsize);
>  		goto failed;
>  	}
> -	if (uspi->s_bsize & (uspi->s_bsize - 1)) {
> +	if (!is_power_of_2(uspi->s_bsize)) {
>  		printk(KERN_ERR "ufs_read_super: block size %u is not a power of 2\n",
>  			uspi->s_bsize);
>  		goto failed;
> 
> -- 
> Vignesh Babu BM 
> _____________________________________________________________ 
> "Why is it that every time I'm with you, makes me believe in magic?"
> 
> 
> 
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-- 
/Evgeniy

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