* [PATCH] KVM: nVMX: Replace a BUG_ON(1) with BUG() to squash clang warning
@ 2020-05-04 15:35 Sean Christopherson
2020-05-04 15:59 ` Paolo Bonzini
0 siblings, 1 reply; 2+ messages in thread
From: Sean Christopherson @ 2020-05-04 15:35 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li, Jim Mattson,
Joerg Roedel, kvm, clang-built-linux, linux-kernel
Use BUG() in the impossible-to-hit default case when switching on the
scope of INVEPT to squash a warning with clang 11 due to clang treating
the BUG_ON() as conditional.
>> arch/x86/kvm/vmx/nested.c:5246:3: warning: variable 'roots_to_free'
is used uninitialized whenever 'if' condition is false
[-Wsometimes-uninitialized]
BUG_ON(1);
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: ce8fe7b77bd8 ("KVM: nVMX: Free only the affected contexts when emulating INVEPT")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/vmx/nested.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 2c36f3f53108..669445136144 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5249,7 +5249,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
roots_to_free = KVM_MMU_ROOTS_ALL;
break;
default:
- BUG_ON(1);
+ BUG();
break;
}
--
2.26.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] KVM: nVMX: Replace a BUG_ON(1) with BUG() to squash clang warning
2020-05-04 15:35 [PATCH] KVM: nVMX: Replace a BUG_ON(1) with BUG() to squash clang warning Sean Christopherson
@ 2020-05-04 15:59 ` Paolo Bonzini
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Bonzini @ 2020-05-04 15:59 UTC (permalink / raw)
To: Sean Christopherson
Cc: Vitaly Kuznetsov, Wanpeng Li, Jim Mattson, Joerg Roedel, kvm,
clang-built-linux, linux-kernel
On 04/05/20 17:35, Sean Christopherson wrote:
> Use BUG() in the impossible-to-hit default case when switching on the
> scope of INVEPT to squash a warning with clang 11 due to clang treating
> the BUG_ON() as conditional.
>
> >> arch/x86/kvm/vmx/nested.c:5246:3: warning: variable 'roots_to_free'
> is used uninitialized whenever 'if' condition is false
> [-Wsometimes-uninitialized]
> BUG_ON(1);
>
> Reported-by: kbuild test robot <lkp@intel.com>
> Fixes: ce8fe7b77bd8 ("KVM: nVMX: Free only the affected contexts when emulating INVEPT")
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kvm/vmx/nested.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 2c36f3f53108..669445136144 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -5249,7 +5249,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
> roots_to_free = KVM_MMU_ROOTS_ALL;
> break;
> default:
> - BUG_ON(1);
> + BUG();
> break;
> }
>
>
Queued, thanks.
Paolo
^ permalink raw reply [flat|nested] 2+ messages in thread
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