linux-kernel - Re: [PATCH v2] x86: Remove compat vdso support

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Message-ID: <531F41C7.6070003@linux.intel.com>
Date:	Tue, 11 Mar 2014 10:03:03 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefani Seibold <stefani@...bold.net>,
	the arch/x86 maintainers <x86@...nel.org>,
	Dave Jones <davej@...hat.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>
Subject: Re: [PATCH v2] x86: Remove compat vdso support

On 03/11/2014 09:45 AM, Andy Lutomirski wrote:
> 
> We could even just relocate the damn thing wherever it ends up.  That
> will waste one page of memory per process, though.
> 

We could definitely relocate it once and use the address across all
processes (e.g. top of the user address space.)

However, just changing one reserved page to two really is a trivial
change which preserves the status quo.

	-hpa

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