linux-kernel - Re: [PATCH v5 2/3] net: add kcov handle to skb extensions

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Date:   Sat, 21 Nov 2020 18:39:32 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Florian Westphal <fw@...len.de>, Ido Schimmel <idosch@...sch.org>
Cc:     Aleksandr Nogikh <aleksandrnogikh@...il.com>, davem@...emloft.net,
        kuba@...nel.org, edumazet@...gle.com, andreyknvl@...gle.com,
        dvyukov@...gle.com, elver@...gle.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        willemdebruijn.kernel@...il.com,
        Aleksandr Nogikh <nogikh@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH v5 2/3] net: add kcov handle to skb extensions

On Sat, 2020-11-21 at 17:52 +0100, Florian Westphal wrote:
> 
> Aleksandr, why was this made into an skb extension in the first place?
> 
> AFAIU this feature is usually always disabled at build time.
> For debug builds (test farm /debug kernel etc) its always needed.
> 
> If thats the case this u64 should be an sk_buff member, not an
> extension.

Because it was requested :-)

https://lore.kernel.org/netdev/20201009161558.57792e1a@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com/

johannes