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From:   angquan yu <angquan21@gmail.com>
To:     skhan@linuxfoundation.org
Cc:     shuah@kernel.org, linux-kselftest@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        angquan yu <angquan21@gmail.com>
Subject: [PATCH] Resolve 'Unused Result' Warning from proc-empty-vm.c
Date:   Tue, 28 Nov 2023 15:29:27 -0600
Message-Id: <20231128212927.59313-1-angquan21@gmail.com>
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From: angquan yu <angquan21@gmail.com>

In tools/testing/selftests/proc/proc-empty->because the return value
of a write call was being ignored. This call was partof a conditional
debugging block (if (0) { ... }), which meant it would neveractually
execute.

This patch removes the unused debug write call. This cleanup resolves
the compi>warning about ignoring the result of write declared with
the warn_unused_resultattribute.

Removing this code also improves the clarity and maintainability of
the function, as it eliminates a non-functional block of code.

This is original warning: proc-empty-vm.c: In function
‘test_proc_pid_statm’ :proc-empty-vm.c:385:17:
warning: ignoring return value of ‘write’
declared with>385 |                 write(1, buf, rv);|

Signed-off-by: angquan yu <angquan21@gmail.com>
---
 tools/testing/selftests/proc/proc-empty-vm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/proc/proc-empty-vm.c b/tools/testing/selftests/proc/proc-empty-vm.c
index 5e7020630..d231e61e4 100644
--- a/tools/testing/selftests/proc/proc-empty-vm.c
+++ b/tools/testing/selftests/proc/proc-empty-vm.c
@@ -383,8 +383,10 @@ static int test_proc_pid_statm(pid_t pid)
 	assert(rv <= sizeof(buf));
 	if (0) {
 		ssize_t written = write(1, buf, rv);
+
 		if (written == -1) {
 			perror("write failed to /proc/${pid}");
+			return EXIT_FAILURE;
 		}
 	}
 
-- 
2.39.2