linux-kernel - [PATCH v1 1/1] selftests: net: af_unix: cast void* to char* in call to macro TH

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Message-ID: <20240812002257.23447-2-mtodorovac69@gmail.com>
Date: Mon, 12 Aug 2024 02:22:58 +0200
From: Mirsad Todorovac <mtodorovac69@...il.com>
To: Paolo Abeni <pabeni@...hat.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Mirsad Todorovac <mtodorovac69@...il.com>
Subject: [PATCH v1 1/1] selftests: net: af_unix: cast void* to char* in call to macro TH_LOG()

GCC 13.2.0 reported warning about (void *) beeing used as a param where (char *) is expected:

In file included from msg_oob.c:14:
msg_oob.c: In function ‘__recvpair’:
../../kselftest_harness.h:106:40: warning: format ‘%s’ expects argument of type ‘char *’,
							but argument 6 has type ‘const void *’ [-Wformat=]
  106 |                 fprintf(TH_LOG_STREAM, "# %s:%d:%s:" fmt "\n", \
      |                                        ^~~~~~~~~~~~~
../../kselftest_harness.h:101:17: note: in expansion of macro ‘__TH_LOG’
  101 |                 __TH_LOG(fmt, ##__VA_ARGS__); \
      |                 ^~~~~~~~
msg_oob.c:235:17: note: in expansion of macro ‘TH_LOG’
  235 |                 TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : expected_buf);
      |                 ^~~~~~
../../kselftest_harness.h:106:40: warning: format ‘%s’ expects argument of type ‘char *’,
							but argument 6 has type ‘const void *’ [-Wformat=]
  106 |                 fprintf(TH_LOG_STREAM, "# %s:%d:%s:" fmt "\n", \
      |                                        ^~~~~~~~~~~~~
../../kselftest_harness.h:101:17: note: in expansion of macro ‘__TH_LOG’
  101 |                 __TH_LOG(fmt, ##__VA_ARGS__); \
      |                 ^~~~~~~~
msg_oob.c:259:25: note: in expansion of macro ‘TH_LOG’
  259 |                 TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : expected_buf);
      |                 ^~~~~~

Casting param to (char *) silences the warning.

Fixes: d098d77232c37 ("selftest: af_unix: Add msg_oob.c.")
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: netdev@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org
Signed-off-by: Mirsad Todorovac <mtodorovac69@...il.com>
---
v1:
 initial version to fix the compiler warning.

 tools/testing/selftests/net/af_unix/msg_oob.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/af_unix/msg_oob.c b/tools/testing/selftests/net/af_unix/msg_oob.c
index 16d0c172eaeb..ae2623eea8ae 100644
--- a/tools/testing/selftests/net/af_unix/msg_oob.c
+++ b/tools/testing/selftests/net/af_unix/msg_oob.c
@@ -232,7 +232,7 @@ static void __recvpair(struct __test_metadata *_metadata,
 
 	if (ret[0] != expected_len || recv_errno[0] != expected_errno) {
 		TH_LOG("AF_UNIX :%s", ret[0] < 0 ? strerror(recv_errno[0]) : recv_buf[0]);
-		TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : expected_buf);
+		TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : (char *)expected_buf);
 
 		ASSERT_EQ(ret[0], expected_len);
 		ASSERT_EQ(recv_errno[0], expected_errno);
@@ -256,7 +256,7 @@ static void __recvpair(struct __test_metadata *_metadata,
 		cmp = strncmp(expected_buf, recv_buf[0], expected_len);
 		if (cmp) {
 			TH_LOG("AF_UNIX :%s", ret[0] < 0 ? strerror(recv_errno[0]) : recv_buf[0]);
-			TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : expected_buf);
+			TH_LOG("Expected:%s", expected_errno ? strerror(expected_errno) : (char *)expected_buf);
 
 			ASSERT_EQ(cmp, 0);
 		}
-- 
2.43.0