linux-kernel - Re: [PATCH v3 06/20] kvm: arm/arm64: Remove spurious WARN

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Message-ID: <57ac04d3-0bbf-a3a4-f9a4-140dac8fa021@redhat.com>
Date:   Fri, 29 Jun 2018 16:51:21 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, james.morse@....com,
        marc.zyngier@....com, cdall@...nel.org, julien.grall@....com,
        will.deacon@....com, catalin.marinas@....com,
        punit.agrawal@....com, qemu-devel@...gnu.org
Subject: Re: [PATCH v3 06/20] kvm: arm/arm64: Remove spurious WARN_ON

Hi Suzuki,

On 06/29/2018 01:15 PM, 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().
> 
> Cc: Marc Zyngier <marc.zyngier@....com>
> Acked-by: Christoffer Dall <cdall@...nel.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 061e6b3..308171c 100644
> --- a/virt/kvm/arm/mmu.c
> +++ b/virt/kvm/arm/mmu.c
> @@ -976,7 +976,7 @@ 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);
> 

Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric