linux-kernel - Re: [PATCH 01/26] KVM: x86: Remove superfluous brackets from case statement

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Date:   Wed, 05 Feb 2020 15:29:28 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 01/26] KVM: x86: Remove superfluous brackets from case statement

Sean Christopherson <sean.j.christopherson@...el.com> writes:

> Remove unnecessary brackets from a case statement that unintentionally
> encapsulates unrelated case statements in the same switch statement.
> While technically legal and functionally correct syntax, the brackets
> are visually confusing and potentially dangerous, e.g. the last of the
> encapsulated case statements has an undocumented fall-through that isn't
> flagged by compilers due the encapsulation.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/x86/kvm/x86.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 7e3f1d937224..24597526b5de 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -5260,7 +5260,7 @@ static void kvm_init_msr_list(void)
>  				 !intel_pt_validate_hw_cap(PT_CAP_single_range_output)))
>  				continue;
>  			break;
> -		case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: {
> +		case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B:
>  			if (!kvm_x86_ops->pt_supported() ||
>  				msrs_to_save_all[i] - MSR_IA32_RTIT_ADDR0_A >=
>  				intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2)
> @@ -5275,7 +5275,7 @@ static void kvm_init_msr_list(void)
>  			if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_EVENTSEL0 >=
>  			    min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
>  				continue;
> -		}
> +			break;
>  		default:
>  			break;
>  		}

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly