linux-kernel - Re: [PATCH 2/5] KVM: arm64: Drop init_common

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Date:   Tue, 10 Aug 2021 14:21:24 +0100
From:   Will Deacon <will@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] KVM: arm64: Drop init_common_resources()

On Tue, Aug 10, 2021 at 12:32:38PM +0530, Anshuman Khandual wrote:
> Could do without this additional indirection via init_common_resources() by
> just calling kvm_set_ipa_limit() directly instead. This change saves memory
> and cycles.

Does it? Really?

Will

> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index e9a2b8f27792..19560e457c11 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -1696,11 +1696,6 @@ static bool init_psci_relay(void)
>  	return true;
>  }
>  
> -static int init_common_resources(void)
> -{
> -	return kvm_set_ipa_limit();
> -}
> -
>  static int init_subsystems(void)
>  {
>  	int err = 0;
> @@ -2102,7 +2097,7 @@ int kvm_arch_init(void *opaque)
>  		}
>  	}
>  
> -	err = init_common_resources();
> +	err = kvm_set_ipa_limit();
>  	if (err)
>  		return err;
>  
> -- 
> 2.20.1
>