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Date: Wed, 10 Sep 2014 21:01:29 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Andrey Ryabinin <a.ryabinin@...sung.com>, linux-kernel@...r.kernel.org CC: Dmitry Vyukov <dvyukov@...gle.com>, Konstantin Serebryany <kcc@...gle.com>, Dmitry Chernenkov <dmitryc@...gle.com>, Andrey Konovalov <adech.fo@...il.com>, Yuri Gribov <tetra2005@...il.com>, Konstantin Khlebnikov <koct9i@...il.com>, Sasha Levin <sasha.levin@...cle.com>, Christoph Lameter <cl@...ux.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, Dave Hansen <dave.hansen@...el.com>, Andi Kleen <andi@...stfloor.org>, Vegard Nossum <vegard.nossum@...il.com>, x86@...nel.org, linux-mm@...ck.org, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com> Subject: Re: [RFC/PATCH v2 02/10] x86_64: add KASan support On 09/10/2014 07:31 AM, Andrey Ryabinin wrote: > This patch add arch specific code for kernel address sanitizer. > > 16TB of virtual addressed used for shadow memory. > It's located in range [0xffff800000000000 - 0xffff900000000000] > Therefore PAGE_OFFSET has to be changed from 0xffff880000000000 > to 0xffff900000000000. NAK on this. 0xffff880000000000 is the lowest usable address because we have agreed to leave 0xffff800000000000-0xffff880000000000 for the hypervisor or other non-OS uses. Bumping PAGE_OFFSET seems needlessly messy, why not just designate a zone higher up in memory? -hpa -- 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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