netdev - Re: [patch] sctp: dubious bitfields in sctp

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Date:	Mon, 24 May 2010 16:12:19 -0400
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	Dan Carpenter <error27@...il.com>
CC:	Sridhar Samudrala <sri@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Wei Yongjun <yjwei@...fujitsu.com>, linux-sctp@...r.kernel.org,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] sctp: dubious bitfields in sctp_transport



Dan Carpenter wrote:
> Sparse complains because these one-bit bitfields are signed.
>   include/net/sctp/structs.h:879:24: error: dubious one-bit signed bitfield
>   include/net/sctp/structs.h:889:31: error: dubious one-bit signed bitfield
>   include/net/sctp/structs.h:895:26: error: dubious one-bit signed bitfield
>   include/net/sctp/structs.h:898:31: error: dubious one-bit signed bitfield
>   include/net/sctp/structs.h:901:27: error: dubious one-bit signed bitfield
> 
> It doesn't cause a problem in the current code, but it would be better
> to clean it up.  This was introduced by c0058a35aacc7: "sctp: Save some
> room in the sctp_transport by using bitfields".
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> ---
> It looks like this header is exported to user space.  I don't know if
> that makes a difference.

That shouldn't make a difference.

-vlad

> 
> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
> index 6173c61..4b86011 100644
> --- a/include/net/sctp/structs.h
> +++ b/include/net/sctp/structs.h
> @@ -876,7 +876,7 @@ struct sctp_transport {
>  
>  	/* Reference counting. */
>  	atomic_t refcnt;
> -	int	 dead:1,
> +	__u32	 dead:1,
>  		/* RTO-Pending : A flag used to track if one of the DATA
>  		 *		chunks sent to this address is currently being
>  		 *		used to compute a RTT. If this flag is 0,
> 
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