linux-kernel - Re: [PATCH v1 07/16] kvm: arm/arm64: Remove spurious WARN

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Message-ID: <20180208110052.GJ29286@cbox>
Date:   Thu, 8 Feb 2018 12:00:52 +0100
From:   Christoffer Dall <christoffer.dall@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, marc.zyngier@....com,
        linux-kernel@...r.kernel.org, kristina.martsenko@....com,
        peter.maydell@...aro.org, pbonzini@...hat.com, rkrcmar@...hat.com,
        will.deacon@....com, ard.biesheuvel@...aro.org,
        mark.rutland@....com, catalin.marinas@....com,
        Christoffer Dall <cdall@...aro.org>
Subject: Re: [PATCH v1 07/16] kvm: arm/arm64: Remove spurious WARN_ON

On Tue, Jan 09, 2018 at 07:04:02PM +0000, Suzuki K Poulose wrote:
> On a 4-level page table pgd entry can be empty, unlike a 3-level
> page table. Remove the spurious WARN_ON() in stage_get_pud().

Acked-by: Christoffer Dall <christoffer.dall@...aro.org>

> 
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Christoffer Dall <cdall@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  virt/kvm/arm/mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
> index e6548c85c495..78253fe00fc4 100644
> --- a/virt/kvm/arm/mmu.c
> +++ b/virt/kvm/arm/mmu.c
> @@ -870,7 +870,7 @@ static pud_t *stage2_get_pud(struct kvm *kvm, struct kvm_mmu_memory_cache *cache
>  	pud_t *pud;
>  
>  	pgd = kvm->arch.pgd + stage2_pgd_index(addr);
> -	if (WARN_ON(stage2_pgd_none(*pgd))) {
> +	if (stage2_pgd_none(*pgd)) {
>  		if (!cache)
>  			return NULL;
>  		pud = mmu_memory_cache_alloc(cache);
> -- 
> 2.13.6
>