linux-kernel - Re: [PATCH] netfilter: conditionally use ct and ctinfo

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Date:   Mon, 7 Mar 2022 22:54:12 +0100
From:   Florian Westphal <fw@...len.de>
To:     Tom Rix <trix@...hat.com>
Cc:     Florian Westphal <fw@...len.de>, pablo@...filter.org,
        kadlec@...filter.org, davem@...emloft.net, kuba@...nel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: conditionally use ct and ctinfo

Tom Rix <trix@...hat.com> wrote:
> 
> On 3/7/22 4:46 AM, Florian Westphal wrote:
> > trix@...hat.com <trix@...hat.com> wrote:
> > > From: Tom Rix <trix@...hat.com>
> > > 
> > > The setting ct and ctinfo are controlled by
> > > CONF_NF_CONNTRACK.  So their use should also
> > > be controlled.
> > Any reason for this change?
> 
> Define and use are connected. Doing something to one without doing something
> to the other doesn't make sense.

We often rely on compiler to remove branches that always evaluate to
false, just like in this case.

> Could removing the CONF_NF_CONNTRACK be done for the define side ?

Doubt it.  Looking at git history it avoids build breakage.