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Date:   Sun, 4 Apr 2021 22:05:17 +0200
From:   Florian Westphal <fw@strlen.de>
To:     "Alejandro Colomar (man-pages)" <alx.manpages@gmail.com>
Cc:     Pablo Neira Ayuso <pablo@netfilter.org>,
        Jozsef Kadlecsik <kadlec@netfilter.org>,
        Florian Westphal <fw@strlen.de>,
        "David S. Miller" <davem@davemloft.net>,
        Harald Welte <laforge@netfilter.org>,
        netfilter-devel@vger.kernel.org, coreteam@netfilter.org
Subject: Re: Unused macro
Message-ID: <20210404200517.GN13699@breakpoint.cc>
References: <f209f7b0-af4c-e41c-b53e-27028b925978@gmail.com>
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Alejandro Colomar (man-pages) <alx.manpages@gmail.com> wrote:
> I was updating the includes on some manual pages, when I found that a
> macro used ARRAY_SIZE() without including a header that defines it.
> That surprised me, because it would more than likely result in a compile
> error, but of course, the macro wasn't being used:
> 
> .../linux$ grep -rn SCTP_CHUNKMAP_IS_ALL_SET
> include/uapi/linux/netfilter/xt_sctp.h:80:#define
> SCTP_CHUNKMAP_IS_ALL_SET(chunkmap) \
> .../linux$

This is an UAPI header, this macro is used by userspace software, e.g.
iptables.