linux-kernel - Re: [PATCH] KVM: arm64: Drop PTE_S2_MEMATTR

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Date:   Thu, 16 Apr 2020 18:05:40 +0100
From:   Will Deacon <will@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Zenghui Yu <yuzenghui@...wei.com>, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, wanghaibin.wang@...wei.com
Subject: Re: [PATCH] KVM: arm64: Drop PTE_S2_MEMATTR_MASK

On Thu, Apr 16, 2020 at 04:36:05PM +0100, Marc Zyngier wrote:
> On Wed, 15 Apr 2020 18:57:46 +0800
> Zenghui Yu <yuzenghui@...wei.com> wrote:
> 
> > The only user of PTE_S2_MEMATTR_MASK macro had been removed since
> > commit a501e32430d4 ("arm64: Clean up the default pgprot setting").
> > It has been about six years and no one has used it again.
> > 
> > Let's drop it.
> > 
> > Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
> > ---
> >  arch/arm64/include/asm/pgtable-hwdef.h | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
> > index 6bf5e650da78..99315bdca0e6 100644
> > --- a/arch/arm64/include/asm/pgtable-hwdef.h
> > +++ b/arch/arm64/include/asm/pgtable-hwdef.h
> > @@ -190,7 +190,6 @@
> >   * Memory Attribute override for Stage-2 (MemAttr[3:0])
> >   */
> >  #define PTE_S2_MEMATTR(t)	(_AT(pteval_t, (t)) << 2)
> > -#define PTE_S2_MEMATTR_MASK	(_AT(pteval_t, 0xf) << 2)
> >  
> >  /*
> >   * EL2/HYP PTE/PMD definitions
> 
> Looks good to me. Catalin, Will: do you want to take this directly? If
> so please add my:
> 
> Acked-by: Marc Zyngier <maz@...nel.org>
> 
> Otherwise, I'll route it via the KVM tree.

I can take it for 5.8 if it's not urgent.

Will