linux-kernel - Re: [PATCH] net: skbuff.h: remove unnecessary unlikely()

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Message-ID: <CAEExFWuUt_enePpEOrDksL+j-W+TNzXyWo9b9zfw-ee1usiVWw@mail.gmail.com>
Date:   Tue, 6 Nov 2018 00:02:14 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     davem@...emloft.net, Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>, dja@...ens.net,
        ast@...nel.org, sbrivio@...hat.com, pabeni@...hat.com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Yangtao Li <tiny.windzz@...il.com>
Subject: Re: [PATCH] net: skbuff.h: remove unnecessary unlikely()

add myself.
-Yangtao
On Mon, Nov 5, 2018 at 9:21 PM Frank Lee <tiny.windzz@...il.com> wrote:
>
> add netdev@...r.kernel.org
> -- Yangtao
> On Sun, Nov 4, 2018 at 9:14 PM Yangtao Li <tiny.windzz@...il.com> wrote:
> >
> > WARN_ON() already contains an unlikely(), so it's not necessary to use
> > unlikely.
> >
> > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > ---
> >  include/linux/skbuff.h | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 0ba687454267..7dcfb5591dc3 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -2508,10 +2508,8 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len);
> >
> >  static inline void __skb_set_length(struct sk_buff *skb, unsigned int len)
> >  {
> > -       if (unlikely(skb_is_nonlinear(skb))) {
> > -               WARN_ON(1);
> > +       if (WARN_ON(skb_is_nonlinear(skb)))
> >                 return;
> > -       }
> >         skb->len = len;
> >         skb_set_tail_pointer(skb, len);
> >  }
> > --
> > 2.17.0
> >