linux-kernel - Re: [PATCH v2 net-next 1/3] net: skb: introduce kfree_skb_with

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Date:   Fri, 31 Dec 2021 18:22:23 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Menglong Dong <menglong8.dong@...il.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        David Ahern <dsahern@...nel.org>, mingo@...hat.com,
        David Miller <davem@...emloft.net>,
        Neil Horman <nhorman@...driver.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        jonathan.lemon@...il.com, alobakin@...me,
        Kees Cook <keescook@...omium.org>,
        Paolo Abeni <pabeni@...hat.com>, talalahmad@...gle.com,
        haokexin@...il.com, Menglong Dong <imagedong@...cent.com>,
        atenart@...nel.org, bigeasy@...utronix.de,
        Wei Wang <weiwan@...gle.com>, arnd@...db.de, vvs@...tuozzo.com,
        Cong Wang <cong.wang@...edance.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Mengen Sun <mengensun@...cent.com>, mungerjiang@...cent.com
Subject: Re: [PATCH v2 net-next 1/3] net: skb: introduce
 kfree_skb_with_reason()

On Fri, 31 Dec 2021 14:35:31 +0800 Menglong Dong wrote:
> > >  void skb_release_head_state(struct sk_buff *skb);
> > >  void kfree_skb(struct sk_buff *skb);  
> >
> > Should this be turned into a static inline calling
> > kfree_skb_with_reason() now? BTW you should drop the
> > '_with'.
> >  
> 
> I thought about it before, but I'm a little afraid that some users may trace
> kfree_skb() with kprobe, making it inline may not be friendly to them?

Hm, there is a bpf sample which does that, but that's probably 
not commonly used given there is a tracepoint. If someone is 
using a kprobe they can switch to kprobing kfree_skb*reason().