linux-kernel - Re: ocfs2: char is not always signed

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Message-ID: <4CE4BC49.10105@oracle.com>
Date:	Thu, 18 Nov 2010 13:40:25 +0800
From:	Tao Ma <tao.ma@...cle.com>
To:	Milton Miller <miltonm@....com>
CC:	Joel Becker <joel.becker@...cle.com>, ocfs2-devel@....oracle.com,
	Mark Fasheh <mfasheh@...e.com>, linux-kernel@...r.kernel.org,
	Goldwyn Rodrigues <rgoldwyn@...e.de>
Subject: Re: ocfs2: char is not always signed



2010-11-18 12:20, Milton Miller wrote:
> Commit 1c66b360fe262 (Change some lock status member in ocfs2_lock_res
> to char.)  states that these fields need to be signed due to comparision
> to -1, but only changed the type from unsigned char to char.   However, it
> is a compiler option if char is a signed or unsigned type.  Change these
> fields to signed char so the code will work with all compilers.
>
> Signed-off-by: Milton Miller<miltonm@....com>
oh, sorry I don't know this. Thanks.
Acked-by: Tao Ma <tao.ma@...cle.com>
> ---
> I did not look for other fields that might be char.  PowerPC compilers
> default to unsigned char, and aparently arm does as well from a quick
> google search, to name two examples.
>
> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
> index 1efea36..70dd3b1 100644
> --- a/fs/ocfs2/ocfs2.h
> +++ b/fs/ocfs2/ocfs2.h
> @@ -159,9 +159,9 @@ struct ocfs2_lock_res {
>   	char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
>   	unsigned int             l_ro_holders;
>   	unsigned int             l_ex_holders;
> -	char			 l_level;
> -	char			 l_requested;
> -	char			 l_blocking;
> +	signed char		 l_level;
> +	signed char		 l_requested;
> +	signed char		 l_blocking;
>
>   	/* Data packed - type enum ocfs2_lock_type */
>   	unsigned char            l_type;
> --
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