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Date: Tue, 11 Mar 2014 22:02:33 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Andy Lutomirski <luto@amacapital.net>,
        "H. Peter Anvin" <hpa@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>, x86@kernel.org
CC: Stefani Seibold <stefani@seibold.net>,
        Andreas Brief <Andreas.Brief@rohde-schwarz.com>,
        Martin Runge <Martin.Runge@rohde-schwarz.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Dave Jones <davej@redhat.com>, Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH v2 0/2] x86: Relocate the compat vdso per process
References: <cover.1394575968.git.luto@amacapital.net>
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On 03/11/2014 03:15 PM, Andy Lutomirski wrote:
> The meat of this patch series is in patch 1.  Patch 2 is split out for
> improved bisectability.
>
> Changes from v1: Split into two patches and fixed a comment.
>
> Andy Lutomirski (2):
>    x86: Dynamically relocate the compat vdso
>    x86_32: Remove user bit from identity map PDE
>
>   Documentation/kernel-parameters.txt  |  18 +++-
>   arch/x86/Kconfig                     |  24 +++--
>   arch/x86/include/asm/elf.h           |   4 -
>   arch/x86/include/asm/fixmap.h        |   8 --
>   arch/x86/include/asm/pgtable_types.h |   7 +-
>   arch/x86/include/asm/vdso.h          |   5 +-
>   arch/x86/vdso/vdso-layout.lds.S      |   2 +-
>   arch/x86/vdso/vdso32-setup.c         | 173 ++++++++++++++++-------------------
>   arch/x86/vdso/vdso32/vdso32.lds.S    |   2 -
>   9 files changed, 111 insertions(+), 132 deletions(-)
>

Why per process?  *If* we have compat vdso turned on, can't we just put 
it in one place system-wide?

	-hpa