linux-kernel - Re: [PATCH net-next] net: generalize calculation of skb extensions length

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Message-ID: <20230823075318.4860cebc@kernel.org>
Date:   Wed, 23 Aug 2023 07:53:18 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     linux@...ssschuh.net
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Robert Marko <robimarko@...il.com>
Subject: Re: [PATCH net-next] net: generalize calculation of skb extensions
 length

On Wed, 23 Aug 2023 10:14:48 +0200 (GMT+02:00) linux@...ssschuh.net
wrote:
> > Could you include more info about the compiler versions you tried
> > and maybe some objdump? We'll have to take your word for it getting
> > optimized out, would be great if we had more proof in the commit msg.
> > --
> > pw-bot: cr  
> 
> Thanks for the feedback.
> I'll send a v2 with more background soon.
> 
> On the other hand this function is only ever
> executed once, so even if it is slightly inefficient
> it shouldn't matter.

Oh you're right, somehow I thought it was for every alloc.
You can mention it's only run at init in the commit msg if 
that's easier.