linux-kernel - Re: [PATCH] selftests: kvm/x86: Fix the warning in pmu_event_filter

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Date:   Wed, 19 Jan 2022 19:37:26 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Jinrong Liang <ljr.kernel@...il.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Jinrong Liang <cloudliang@...cent.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests: kvm/x86: Fix the warning in
 pmu_event_filter_test.c

On 1/19/22 14:39, Jinrong Liang wrote:
> From: Jinrong Liang <cloudliang@...cent.com>
> 
> The following warning appears when executing
> make -C tools/testing/selftests/kvm
> 
> x86_64/pmu_event_filter_test.c: In function ‘vcpu_supports_intel_br_retired’:
> x86_64/pmu_event_filter_test.c:241:28: warning: variable ‘cpuid’ set but not used [-Wunused-but-set-variable]
>    241 |         struct kvm_cpuid2 *cpuid;
>        |                            ^~~~~
> x86_64/pmu_event_filter_test.c: In function ‘vcpu_supports_amd_zen_br_retired’:
> x86_64/pmu_event_filter_test.c:258:28: warning: variable ‘cpuid’ set but not used [-Wunused-but-set-variable]
>    258 |         struct kvm_cpuid2 *cpuid;
>        |                            ^~~~~
> 
> Just delete the unused variables to stay away from warnings.
> 
> Fixes: dc7e75b3b3ee ("selftests: kvm/x86: Add test for KVM_SET_PMU_EVENT_FILTER")
> Signed-off-by: Jinrong Liang <cloudliang@...cent.com>
> ---
>   tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
> index 8ac99d4cbc73..0611a5c24bbc 100644
> --- a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
> @@ -238,9 +238,7 @@ static void test_not_member_allow_list(struct kvm_vm *vm)
>   static bool vcpu_supports_intel_br_retired(void)
>   {
>   	struct kvm_cpuid_entry2 *entry;
> -	struct kvm_cpuid2 *cpuid;
>   
> -	cpuid = kvm_get_supported_cpuid();
>   	entry = kvm_get_supported_cpuid_index(0xa, 0);
>   	return entry &&
>   		(entry->eax & 0xff) &&
> @@ -255,9 +253,7 @@ static bool vcpu_supports_intel_br_retired(void)
>   static bool vcpu_supports_amd_zen_br_retired(void)
>   {
>   	struct kvm_cpuid_entry2 *entry;
> -	struct kvm_cpuid2 *cpuid;
>   
> -	cpuid = kvm_get_supported_cpuid();
>   	entry = kvm_get_supported_cpuid_index(1, 0);
>   	return entry &&
>   		((x86_family(entry->eax) == 0x17 &&

Queued, thanks.

Paolo