linux-kernel - [PATCH AUTOSEL 5.10 16/23] selftests:kvm: fix get_warnings

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Message-Id: <20210928055645.172544-16-sashal@kernel.org>
Date:   Tue, 28 Sep 2021 01:56:37 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>, shuah@...nel.org,
        kvm@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 16/23] selftests:kvm: fix get_warnings_count() ignoring fscanf() return warn

From: Shuah Khan <skhan@...uxfoundation.org>

[ Upstream commit 39a71f712d8a13728febd8f3cb3f6db7e1fa7221 ]

Fix get_warnings_count() to check fscanf() return value to get rid
of the following warning:

x86_64/mmio_warning_test.c: In function ‘get_warnings_count’:
x86_64/mmio_warning_test.c:85:2: warning: ignoring return value of ‘fscanf’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   85 |  fscanf(f, "%d", &warnings);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Acked-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/kvm/x86_64/mmio_warning_test.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c b/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
index e6480fd5c4bd..8039e1eff938 100644
--- a/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
+++ b/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
@@ -82,7 +82,8 @@ int get_warnings_count(void)
 	FILE *f;
 
 	f = popen("dmesg | grep \"WARNING:\" | wc -l", "r");
-	fscanf(f, "%d", &warnings);
+	if (fscanf(f, "%d", &warnings) < 1)
+		warnings = 0;
 	fclose(f);
 
 	return warnings;
-- 
2.33.0