linux-kernel - Re: [PATCH V2] fs/omfs/inode.c: use ULLONG

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Message-ID: <20140615161142.GC15404@localhost>
Date:	Sun, 15 Jun 2014 12:11:42 -0400
From:	Bob Copeland <me@...copeland.com>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH V2] fs/omfs/inode.c: use ULLONG_MAX instead of ~0ULL

On Sun, Jun 15, 2014 at 08:39:20AM +0200, Fabian Frederick wrote:
> Use more explicit kernel.h definition
>  	array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize);
>  
> -	if (sbi->s_bitmap_ino == ~0ULL)
> +	if (sbi->s_bitmap_ino == ULLONG_MAX)
>  		goto out;

So I agree they are the same, but is there a good reason for the
change?

Semantically, I think of ~0ULL as "all ones" whereas ULLONG_MAX
as a maximum of a magnitude comparison, which this is not really.

-- 
Bob Copeland %% www.bobcopeland.com
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