Re: [PATCH v2] KVM: selftests: Compile code with warnings enabled

[Vitaly Kuznetsov]

Peter Xu <peterx@xxxxxxxxxx> writes:

> On Fri, May 17, 2019 at 11:04:45AM +0200, Thomas Huth wrote:
>> So far the KVM selftests are compiled without any compiler warnings
>> enabled. That's quite bad, since we miss a lot of possible bugs this
>> way. Let's enable at least "-Wall" and some other useful warning flags
>> now, and fix at least the trivial problems in the code (like unused
>> variables).
>> 
>> Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
>> ---
>>  v2:
>>  - Rebased to kvm/queue
>>  - Fix warnings in state_test.c and evmcs_test.c, too
>
> I still see these warnings (probably because the hyperv_cpuid.c is a
> new test):
>
> In file included from x86_64/hyperv_cpuid.c:18:
> x86_64/hyperv_cpuid.c: In function âtest_hv_cpuidâ:
> x86_64/hyperv_cpuid.c:61:33: warning: suggest parentheses around comparison in operand of â==â [-Wparentheses]
>    TEST_ASSERT(entry->padding[0] == entry->padding[1]
>                ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
> include/test_util.h:32:15: note: in definition of macro âTEST_ASSERTâ
>   test_assert((e), #e, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
>                ^
> x86_64/hyperv_cpuid.c:62:8: warning: suggest parentheses around comparison in operand of â==â [-Wparentheses]
>    TEST_ASSERT(entry->padding[0] == entry->padding[1]
>                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>         == entry->padding[2] == 0,
>         ^~~~~~~~~~~~~~~~~~~~
> include/test_util.h:32:15: note: in definition of macro âTEST_ASSERTâ
>   test_assert((e), #e, __FILE__, __LINE__, fmt, ##__VA_ARGS__)

There's a fix from Dan Carpenter on the list:
https://marc.info/?l=kernel-janitors&m=155783012012532&w=2

>                ^
> x86_64/hyperv_cpuid.c: In function âkvm_get_supported_hv_cpuidâ:
> x86_64/hyperv_cpuid.c:93:6: warning: unused variable âretâ [-Wunused-variable]
>   int ret;
>       ^~~
>
> The first two seem to be real bugs in the test code, and the 3rd one
> might need a cleanup too.

-- 
Vitaly