netdev - Re: [PATCH net-next 00/11] skb_put_zero() used to optimize code

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Message-Id: <20170614.161525.2134047919967901982.davem@davemloft.net>
Date:   Wed, 14 Jun 2017 16:15:25 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     johannes@...solutions.net
Cc:     cugyly@....com, netdev@...r.kernel.org,
        Linyu.Yuan@...atel-sbell.com.cn
Subject: Re: [PATCH net-next 00/11] skb_put_zero() used to optimize code

From: Johannes Berg <johannes@...solutions.net>
Date: Wed, 14 Jun 2017 22:11:54 +0200

> On Wed, 2017-06-14 at 15:38 -0400, David Miller wrote:
> 
>> What do you think about Stephen Hemminger's feedback to make
>> skb_put_zero() return "void *".  It will avoid a lot of casts and
>> make the conversions look nicer.
> 
> I think it's a good idea. I can send a patch, and remove some casts
> where they exist - I guess we could also do it even for skb_put()
> eventually.
> 
>> I'll also defer on this patch series until we have the spatch thing
>> which can catch all of them.
> 
> I think I have something that covers most cases, will send out an RFC
> in a minute (since I'm not sure I was able to build it all yet).

All sounds great.

> Note that some of the cases like in ipv6/ndisc.c certainly can't be
> done automatically, they look correct but are more complicated because
> there's not just a single big memset(), but they're doing it piece by
> piece (fill some bytes, clear some others, etc.) Might be worth
> checking which aren't covered by the spatch.

Understood.