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Date:   Thu, 22 Jul 2021 20:07:28 +0200 (CEST)
From:   Justin Iurman <justin.iurman@...ege.be>
To:     Matthieu Baerts <matthieu.baerts@...sares.net>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] ipv6: fix "'ioam6_if_id_max' defined but not
 used" warn

> When compiling without CONFIG_SYSCTL, this warning appears:
> 
>  net/ipv6/addrconf.c:99:12: error: 'ioam6_if_id_max' defined but not used
>  [-Werror=unused-variable]
>     99 | static u32 ioam6_if_id_max = U16_MAX;
>        |            ^~~~~~~~~~~~~~~
>  cc1: all warnings being treated as errors
> 
> Simply moving the declaration of this variable under ...
> 
>  #ifdef CONFIG_SYSCTL
> 
> ... with other similar variables fixes the issue.
> 
> Fixes: 9ee11f0fff20 ("ipv6: ioam: Data plane support for Pre-allocated Trace")
> Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> ---
> 
> Notes:
>    Please note that this 'ioam6_if_id_max' variable could certainly be
>    declared as 'const' like some others used as limits for sysctl knobs.
>    But here, this patch focuses on fixing the warning reported by GCC.
> 
> net/ipv6/addrconf.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 1802287977f1..db0a89810f28 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -96,8 +96,6 @@
> #define IPV6_MAX_STRLEN \
> 	sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
> 
> -static u32 ioam6_if_id_max = U16_MAX;
> -
> static inline u32 cstamp_delta(unsigned long cstamp)
> {
> 	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
> @@ -6550,6 +6548,7 @@ static int addrconf_sysctl_disable_policy(struct ctl_table
> *ctl, int write,
> 
> static int minus_one = -1;
> static const int two_five_five = 255;
> +static u32 ioam6_if_id_max = U16_MAX;
> 
> static const struct ctl_table addrconf_sysctl[] = {
> 	{
> --
> 2.31.1

Good catch, thanks for the patch.

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