This is a note to let you know that I've just added the patch titled selftests:kvm: fix get_warnings_count() ignoring fscanf() return warn to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: selftests-kvm-fix-get_warnings_count-ignoring-fscanf.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 5cc4675a0b44f5bb59a07f11b06d5f3ae70ff6ba Author: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> Date: Wed Sep 15 15:28:06 2021 -0600 selftests:kvm: fix get_warnings_count() ignoring fscanf() return warn [ 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@xxxxxxxxxxxxxxxxxxx> Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> 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 00bb97d76000..2cbc09aad7f6 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;