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Date: Mon, 2 May 2016 15:00:51 -0700
From: Dave Hansen <>
To: Thomas Garnier <>, "H . Peter Anvin" <>,
 Thomas Gleixner <>, Ingo Molnar <>,
 Borislav Petkov <>, Andy Lutomirski <>,
 Dmitry Vyukov <>, Paolo Bonzini <>,
 Dan Williams <>, Kees Cook <>,
 Stephen Smalley <>, Kefeng Wang
 <>, Jonathan Corbet <>,
 Matt Fleming <>, Toshi Kani <>,
 Alexander Kuleshov <>,
 Alexander Popov <>, Joerg Roedel <>,
 Dave Young <>, Baoquan He <>,
 Mark Salter <>,
 Boris Ostrovsky <>
Subject: Re: [PATCH v2 3/4] x86, boot: Implement ASLR for kernel memory
 sections (x86_64)

On 05/02/2016 02:41 PM, Thomas Garnier wrote:
> -#define __PAGE_OFFSET           _AC(0xffff880000000000, UL)
> +#define __PAGE_OFFSET_BASE      _AC(0xffff880000000000, UL)
> +#define __PAGE_OFFSET           page_offset_base
> +#else
> +#define __PAGE_OFFSET           __PAGE_OFFSET_BASE

Do you have any data about the performance impact of this change?  It's
not necessary to have it to merge something like this, I'm just curious
how bad it is.

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