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Message-ID: <20101117171613.GB5308@n2100.arm.linux.org.uk> Date: Wed, 17 Nov 2010 17:16:13 +0000 From: Russell King - ARM Linux <linux@....linux.org.uk> To: Catalin Marinas <catalin.marinas@....com> 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, Nov 17, 2010 at 05:02:37PM +0000, Catalin Marinas wrote: > On 15 November 2010 18:30, Russell King - ARM Linux > <linux@....linux.org.uk> wrote: > > On Fri, Nov 12, 2010 at 06:00:25PM +0000, Catalin Marinas wrote: > >> --- a/arch/arm/include/asm/pgtable-2level.h > >> +++ b/arch/arm/include/asm/pgtable-2level.h > >> @@ -128,6 +128,8 @@ > >> #define L_PTE_USER (1 << 8) > >> #define L_PTE_EXEC (1 << 9) > >> #define L_PTE_SHARED (1 << 10) /* shared(v6), coherent(xsc3) */ > >> +#define L_PTE_NOEXEC (0) > >> +#define L_PTE_NOWRITE (0) > > > > Let's not make this more complicated than it has to be. If we need the > > inverse of WRITE and EXEC, then that's what we should change everyone to, > > not invent a new system to work along side the old system. > > Question on the pgprot_noncached/writecombine/dmacoherent - in the > current implementation we pass L_PTE_EXEC on the dmacoherent macro. Erm. Please look at the code again. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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