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Date:   Wed, 8 Apr 2020 17:32:44 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Mark Rutland <mark.rutland@arm.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Andrew Morton <akpm@linux-foundation.org>,
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Subject: Re: [PATCH 18/28] mm: enforce that vmap can't map pages executable
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References: <20200408115926.1467567-1-hch@lst.de> <20200408115926.1467567-19-hch@lst.de> <20200408123835.GB36478@lakrids.cambridge.arm.com>
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On Wed, Apr 08, 2020 at 01:38:36PM +0100, Mark Rutland wrote:
> > +static inline pgprot_t pgprot_nx(pgprot_t prot)
> > +{
> > +	return __pgprot(pgprot_val(prot) | _PAGE_NX);
> > +}
> > +#define pgprot_nx pgprot_nx
> > +
> >  #ifdef CONFIG_X86_PAE
> 
> I reckon for arm64 we can do similar in our <asm/pgtable.h>:
> 
> #define pgprot_nx(pgprot_t prot) \
> 	__pgprot_modify(prot, 0, PTE_PXN)
> 
> ... matching the style of our existing pgprot_*() modifier helpers.

I've added that for the next version with attribution to you.