linux-kernel - [PATCH] selftests/proc: fix unused result warning during test compilation

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Message-Id: <20240625152139.16412-1-jain.abhinav177@gmail.com>
Date: Tue, 25 Jun 2024 15:21:39 +0000
From: Abhinav Jain <jain.abhinav177@...il.com>
To: shuah@...nel.org,
	akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Cc: skhan@...uxfoundation.org,
	jain.abhinav177@...il.com,
	javier.carrasco.cruz@...il.com
Subject: [PATCH] selftests/proc: fix unused result warning during test compilation

Check the return value from write function to get rid of the warning
during test compilation, shared below.
Tested by compiling after the change, the warning disappears.

proc-empty-vm.c:385:17: warning: ignoring return value of ‘write’
declared with attribute ‘warn_unused_result’ [-Wunused-result]
  385 |                 write(1, buf, rv);

Signed-off-by: Abhinav Jain <jain.abhinav177@...il.com>
---
 tools/testing/selftests/proc/proc-empty-vm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/proc/proc-empty-vm.c b/tools/testing/selftests/proc/proc-empty-vm.c
index 56198d4ca2bf..510ab4a5330a 100644
--- a/tools/testing/selftests/proc/proc-empty-vm.c
+++ b/tools/testing/selftests/proc/proc-empty-vm.c
@@ -382,7 +382,12 @@ static int test_proc_pid_statm(pid_t pid)
 	assert(rv >= 0);
 	assert(rv <= sizeof(buf));
 	if (0) {
-		write(1, buf, rv);
+		ssize_t bytes_written = write(1, buf, rv);
+
+		if (bytes_written != rv) {
+			perror("write");
+			return EXIT_FAILURE;
+		}
 	}
 
 	const char *p = buf;
-- 
2.34.1