linux-kernel - [PATCH] openvswitch: fix linking without CONFIG_NF_CONNTRACK

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Date:   Fri,  2 Nov 2018 16:36:55 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Pravin B Shelar <pshelar@....org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Flavio Leitner <fbl@...hat.com>,
        Gao Feng <gfree.wind@....163.com>,
        Thierry Du Tre <thierry@...ystems.be>,
        Yi-Hung Wei <yihung.wei@...il.com>,
        Ed Swierk <eswierk@...portsystems.com>,
        Julia Lawall <Julia.Lawall@...6.fr>, netdev@...r.kernel.org,
        dev@...nvswitch.org, linux-kernel@...r.kernel.org
Subject: [PATCH] openvswitch: fix linking without CONFIG_NF_CONNTRACK_LABELS

When CONFIG_CC_OPTIMIZE_FOR_DEBUGGING is enabled, the compiler
fails to optimize out a dead code path, which leads to a link failure:

net/openvswitch/conntrack.o: In function `ovs_ct_set_labels':
conntrack.c:(.text+0x2e60): undefined reference to `nf_connlabels_replace'

In this configuration, we can take a shortcut, and completely
remove the contrack label code. This may also help the regular
optimization.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 net/openvswitch/conntrack.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 6bec37ab4472..a4660c48ff01 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -1203,7 +1203,8 @@ static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
 					 &info->labels.mask);
 		if (err)
 			return err;
-	} else if (labels_nonzero(&info->labels.mask)) {
+	} else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
+		   labels_nonzero(&info->labels.mask)) {
 		err = ovs_ct_set_labels(ct, key, &info->labels.value,
 					&info->labels.mask);
 		if (err)
-- 
2.18.0