linux-kernel - Re: [PATCH 00 of 10] x86: unify asm/pgtable.h

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Date:	Wed, 9 Jan 2008 02:16:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>,
	Glauber de Oliveira Costa <glommer@...il.com>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: [PATCH 00 of 10] x86: unify asm/pgtable.h


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> This isn't correct, because it will set _PAGE_GLOBAL on 32-bit 
> unconditionally.  It needs to be something like:

hm, why is that a problem? Ah, the VDSO page must not be global-mapped, 
right? It's getting late here, i should stop modifying the kernel ;)

> +#define GLOBAL_PGPROT(prot)	__pgprot(prot | _PAGE_GLOBAL)
> +
> +#define PAGE_KERNEL			GLOBAL_PGPROT(__PAGE_KERNEL)
> +#define PAGE_KERNEL_RO			GLOBAL_PGPROT(__PAGE_KERNEL_RO)
> +#define PAGE_KERNEL_EXEC		GLOBAL_PGPROT(__PAGE_KERNEL_EXEC)
> +#define PAGE_KERNEL_RX			GLOBAL_PGPROT(__PAGE_KERNEL_RX)
> +#define PAGE_KERNEL_NOCACHE		GLOBAL_PGPROT(__PAGE_KERNEL_NOCACHE)
> +#define PAGE_KERNEL_LARGE		GLOBAL_PGPROT(__PAGE_KERNEL_LARGE)
> +#define PAGE_KERNEL_LARGE_EXEC		GLOBAL_PGPROT(__PAGE_KERNEL_LARGE_EXEC)
> +#define PAGE_KERNEL_VSYSCALL		GLOBAL_PGPROT(__PAGE_KERNEL_VSYSCALL)
> +#define PAGE_KERNEL_VSYSCALL_NOCACHE	GLOBAL_PGPROT(__PAGE_KERNEL_VSYSCALL_NOCACHE)

i suspect you wanted to make GLOBAL_PGPROT a NOP on 32-bit?

but i think it would be better to just do this distinction for the 
PAGE_KERNEL_VSYSCALL?

	Ingo
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