linux-kernel - Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and L_PTE

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Date:	Wed, 17 Nov 2010 17:30:33 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and
 L_PTE_NOWRITE

On Wed, 2010-11-17 at 17:24 +0000, Russell King - ARM Linux wrote:
> On Wed, Nov 17, 2010 at 05:22:12PM +0000, Catalin Marinas wrote:
> > Ah, good point, that was the mask.
> >
> > So for dmacoherent we make sure that L_PTE_EXEC is cleared. I suspect
> > we should now make sure that L_PTE_NOEXEC is set. For the other two,
> > just leave them as they are.
> 
> Already done:
> 
>  #define pgprot_dmacoherent(prot) \
> -       __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_BUFFERABLE)
> +       __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE|L_PTE_XN)
> ...
>  #define pgprot_dmacoherent(prot) \
> -       __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_UNCACHED)
> +       __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED|L_PTE_XN)

Are you already doing such changes? Just to avoid duplicating effort
(and use common naming scheme).

-- 
Catalin

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