linux-kernel - Re: [PATCH] x86_64: Implement personality ADDR_LIMIT

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Message-ID: <20081006132651.GG3180@one.firstfloor.org>
Date:	Mon, 6 Oct 2008 15:26:51 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86_64: Implement personality ADDR_LIMIT_32BIT

> > Linux interfaces are not supposed to be "interfaces for qemu" but generally
> > applicable interfaces.
> 
> I know. What about adding both personality() and flag for shmat()? I can
> prepare patch that implement flag for shmat().

It would be better to just fix all calls in qemu than
to add a new personality. There aren't that many anyways.

personality is really more a kludge for bug-to-bug compatibility
with old binaries (that is where the 3GB personality came from
to work around bugs in some old JVMs that could not deal with a full 4GB
address space), it shouldn't be really used for anything new. 

-Andi
-- 
ak@...ux.intel.com
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