netdev - Re: [PATCH v3 1/2] sctp: compress bit-wide flags to a bitfield on sctp

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Date:	Tue, 12 Apr 2016 15:50:26 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:	netdev@...r.kernel.org, Vlad Yasevich <vyasevich@...il.com>,
	linux-sctp@...r.kernel.org, David Laight <David.Laight@...LAB.COM>,
	Jakub Sitnicki <jkbs@...hat.com>
Subject: Re: [PATCH v3 1/2] sctp: compress bit-wide flags to a bitfield on
 sctp_sock

On Fri, Apr 08, 2016 at 04:41:27PM -0300, Marcelo Ricardo Leitner wrote:
> It wastes space and gets worse as we add new flags, so convert bit-wide
> flags to a bitfield.
> 
> Currently it already saves 4 bytes in sctp_sock, which are left as holes
> in it for now. The whole struct needs packing, which should be done in
> another patch.
> 
> Note that do_auto_asconf cannot be merged, as explained in the comment
> before it.
> 
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> ---
>  include/net/sctp/structs.h | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
> index 6df1ce7a411c548bda4163840a90578b6e1b4cfe..1a6a626904bba4223b7921bbb4be41c2550271a7 100644
> --- a/include/net/sctp/structs.h
> +++ b/include/net/sctp/structs.h
> @@ -210,14 +210,14 @@ struct sctp_sock {
>  	int user_frag;
>  
>  	__u32 autoclose;
> -	__u8 nodelay;
> -	__u8 disable_fragments;
> -	__u8 v4mapped;
> -	__u8 frag_interleave;
>  	__u32 adaptation_ind;
>  	__u32 pd_point;
> -	__u8 recvrcvinfo;
> -	__u8 recvnxtinfo;
> +	__u16	nodelay:1,
> +		disable_fragments:1,
> +		v4mapped:1,
> +		frag_interleave:1,
> +		recvrcvinfo:1,
> +		recvnxtinfo:1;
>  
>  	atomic_t pd_mode;
>  	/* Receive to here while partial delivery is in effect. */
> -- 
> 2.5.0
> 
> --
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> 

I've not run it myself, but this series looks reasonable

Acked-by: Neil Horman <nhorman@...driver.com>