2021-05-28 20:08:55

by Gustavo A. R. Silva

Subject: [PATCH][next] KVM: x86: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix a couple
of warnings by explicitly adding break statements instead of just letting
the code fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
JFYI: We had thousands of these sorts of warnings and now we are down
to just 25 in linux-next. These are some of those last remaining
warnings.

arch/x86/kvm/cpuid.c | 1 +
arch/x86/kvm/vmx/vmx.c | 1 +
2 files changed, 2 insertions(+)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 9a48f138832d..b4da665bb892 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -655,6 +655,7 @@ static int __do_cpuid_func_emulated(struct kvm_cpuid_array *array, u32 func)
if (kvm_cpu_cap_has(X86_FEATURE_RDTSCP))
entry->ecx = F(RDPID);
++array->nent;
+ break;
default:
break;
}
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 4bceb5ca3a89..e7d98c3d398e 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6248,6 +6248,7 @@ void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
switch (kvm_get_apic_mode(vcpu)) {
case LAPIC_MODE_INVALID:
WARN_ONCE(true, "Invalid local APIC state");
+ break;
case LAPIC_MODE_DISABLED:
break;
case LAPIC_MODE_XAPIC:
--
2.27.0

2021-06-01 08:21:59

by Paolo Bonzini

Subject: Re: [PATCH][next] KVM: x86: Fix fall-through warnings for Clang

On 28/05/21 22:07, Gustavo A. R. Silva wrote:
> In preparation to enable -Wimplicit-fallthrough for Clang, fix a couple
> of warnings by explicitly adding break statements instead of just letting
> the code fall through to the next case.
>
> Link: https://github.com/KSPP/linux/issues/115
> Signed-off-by: Gustavo A. R. Silva <[email protected]>
> ---
> JFYI: We had thousands of these sorts of warnings and now we are down
> to just 25 in linux-next. These are some of those last remaining
> warnings.
>
> arch/x86/kvm/cpuid.c | 1 +
> arch/x86/kvm/vmx/vmx.c | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 9a48f138832d..b4da665bb892 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -655,6 +655,7 @@ static int __do_cpuid_func_emulated(struct kvm_cpuid_array *array, u32 func)
> if (kvm_cpu_cap_has(X86_FEATURE_RDTSCP))
> entry->ecx = F(RDPID);
> ++array->nent;
> + break;
> default:
> break;
> }
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 4bceb5ca3a89..e7d98c3d398e 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -6248,6 +6248,7 @@ void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
> switch (kvm_get_apic_mode(vcpu)) {
> case LAPIC_MODE_INVALID:
> WARN_ONCE(true, "Invalid local APIC state");
> + break;
> case LAPIC_MODE_DISABLED:
> break;
> case LAPIC_MODE_XAPIC:
>

Queued, thanks.

Paolo