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From: Amer Al Shanawany <amer.shanawany@gmail.com>
To: Shuah Khan <shuah@kernel.org>,
	Christian Brauner <brauner@kernel.org>,
	Miklos Szeredi <mszeredi@redhat.com>,
	linux-kselftest@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Subject: [PATCH] selftests: filesystems: fix warn_unused_result build warnings
Date: Wed, 17 Apr 2024 20:49:13 +0200
Message-Id: <20240417184913.74734-1-amer.shanawany@gmail.com>
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Fix the following warnings by adding return check and error messages.

statmount_test.c: In function ‘cleanup_namespace’:
statmount_test.c:128:9: warning: ignoring return value of ‘fchdir’
declared with attribute ‘warn_unused_result’ [-Wunused-result]
  128 |         fchdir(orig_root);
      |         ^~~~~~~~~~~~~~~~~
statmount_test.c:129:9: warning: ignoring return value of ‘chroot’
declared with attribute ‘warn_unused_result’ [-Wunused-result]
  129 |         chroot(".");
      |         ^~~~~~~~~~~

Signed-off-by: Amer Al Shanawany <amer.shanawany@gmail.com>
---
 .../selftests/filesystems/statmount/statmount_test.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/filesystems/statmount/statmount_test.c b/tools/testing/selftests/filesystems/statmount/statmount_test.c
index e6d7c4f1c85b..e8c019d72cbf 100644
--- a/tools/testing/selftests/filesystems/statmount/statmount_test.c
+++ b/tools/testing/selftests/filesystems/statmount/statmount_test.c
@@ -125,8 +125,16 @@ static uint32_t old_root_id, old_parent_id;
 
 static void cleanup_namespace(void)
 {
-	fchdir(orig_root);
-	chroot(".");
+	int ret;
+
+	ret = fchdir(orig_root);
+	if (ret == -1)
+		ksft_perror("fchdir to original root");
+
+	ret = chroot(".");
+	if (ret == -1)
+		ksft_perror("chroot to original root");
+
 	umount2(root_mntpoint, MNT_DETACH);
 	rmdir(root_mntpoint);
 }
-- 
2.34.1