linux-kernel - [PATCH] selftests:proc-empty-vm: Remove unused debug write callIn the function test_proc_pid

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Date:   Sat, 18 Nov 2023 23:08:01 -0600
From:   angquan yu <angquan21@...il.com>
To:     linux-kselftest@...r.kernel.org
Cc:     kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, shuah@...nel.org,
        angquan yu <angquan21@...il.com>
Subject: [PATCH] selftests:proc-empty-vm: Remove unused debug write callIn the function test_proc_pid_statm

From: angquan yu <angquan21@...il.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 ofthe 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@...il.com>
---
 tools/testing/selftests/proc/proc-empty-vm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/proc/proc-empty-vm.c b/tools/testing/selftests/proc/proc-empty-vm.c
index 56198d4ca..74ef8627f 100644
--- a/tools/testing/selftests/proc/proc-empty-vm.c
+++ b/tools/testing/selftests/proc/proc-empty-vm.c
@@ -382,7 +382,10 @@ static int test_proc_pid_statm(pid_t pid)
 	assert(rv >= 0);
 	assert(rv <= sizeof(buf));
 	if (0) {
-		write(1, buf, rv);
+		ssize_t written = write(1, buf, rv);
+		if (written == -1) {
+			perror("write failed /proc/${pid}");
+		}
 	}
 
 	const char *p = buf;
-- 
2.39.2