netdev - Re: [PATCH net-next 01/11] ipv6: skb_put

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Message-ID: <1497466892.9377.5.camel@sipsolutions.net>
Date:   Wed, 14 Jun 2017 21:01:32 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        yuan linyu <cugyly@....com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
Subject: Re: [PATCH net-next 01/11] ipv6: skb_put_zero() used to optimize
 code

On Wed, 2017-06-14 at 08:44 -0700, Stephen Hemminger wrote:
> 
> >  	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
> >  
> > -	hdr = (struct mld_msg *) skb_put(skb, sizeof(struct
> > mld_msg));
> > -	memset(hdr, 0, sizeof(struct mld_msg));
> > +	hdr = (struct mld_msg *) skb_put_zero(skb, sizeof(struct
> > mld_msg));
> 
> Why does skb_put_zero return char * instead of void *?
> If returned void * it would save having to add lots of casts.
> 
> One could even go farther by making skb_put_zero a macro and
> use typeof().

I just copied it from skb_put() - you could ask the same there? :)

No objection to changing it though.

johannes