linux-kernel - [PATCH 2/2] selftests/netfilter: return a value for several "int" functions

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Date: Sun,  5 May 2024 14:47:16 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Shuah Khan <shuah@...nel.org>
Cc: Phil Sutter <phil@....cc>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Florian Westphal <fw@...len.de>,
	Felix Huettner <felix.huettner@...l.schwarz>,
	Max Lamprecht <max.lamprecht@...l.schwarz>,
	Luca Czesla <luca.czesla@...l.schwarz>,
	Xin Long <lucien.xin@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Paul Moore <paul@...l-moore.com>,
	Richard Guy Briggs <rgb@...hat.com>,
	Boris Sukholitko <boris.sukholitko@...adcom.com>,
	Valentin Obst <kernel@...entinobst.de>,
	linux-kselftest@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	llvm@...ts.linux.dev,
	John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 2/2] selftests/netfilter: return a value for several "int" functions

When building with clang, via:

    make LLVM=1 -C tools/testing/selftests

..clang warns, correctly, that several functions declared with an "int"
return type are not always returning values in all cases (or at least,
clang cannot prove that they always return a value).

Fix this by returning 0 for each function. (For these functions,
non-zero values indicate failure.)

Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 tools/testing/selftests/netfilter/conntrack_dump_flush.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/netfilter/conntrack_dump_flush.c b/tools/testing/selftests/netfilter/conntrack_dump_flush.c
index b11ea8ee6719..2513221ae5e6 100644
--- a/tools/testing/selftests/netfilter/conntrack_dump_flush.c
+++ b/tools/testing/selftests/netfilter/conntrack_dump_flush.c
@@ -43,6 +43,7 @@ static int build_cta_tuple_v4(struct nlmsghdr *nlh, int type,
 	mnl_attr_nest_end(nlh, nest_proto);
 
 	mnl_attr_nest_end(nlh, nest);
+	return 0;
 }
 
 static int build_cta_tuple_v6(struct nlmsghdr *nlh, int type,
@@ -71,6 +72,7 @@ static int build_cta_tuple_v6(struct nlmsghdr *nlh, int type,
 	mnl_attr_nest_end(nlh, nest_proto);
 
 	mnl_attr_nest_end(nlh, nest);
+	return 0;
 }
 
 static int build_cta_proto(struct nlmsghdr *nlh)
@@ -90,6 +92,7 @@ static int build_cta_proto(struct nlmsghdr *nlh)
 	mnl_attr_nest_end(nlh, nest_proto);
 
 	mnl_attr_nest_end(nlh, nest);
+	return 0;
 }
 
 static int conntrack_data_insert(struct mnl_socket *sock, struct nlmsghdr *nlh,
@@ -207,6 +210,7 @@ static int conntrack_data_generate_v6(struct mnl_socket *sock,
 static int count_entries(const struct nlmsghdr *nlh, void *data)
 {
 	reply_counter++;
+	return 0;
 }
 
 static int conntracK_count_zone(struct mnl_socket *sock, uint16_t zone)
-- 
2.45.0