linux-kernel - Re: NACK! Re: [PATCH 4/4] Add vsyscalls to feature-removal-schedule.txt

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Date:	Fri, 12 Aug 2011 15:13:42 -0400
From:	Andrew Lutomirski <luto@....edu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	lueckintel@...oo.com, kimwooyoung@...il.com,
	Ingo Molnar <mingo@...e.hu>, Borislav Petkov <bp@...en8.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: NACK! Re: [PATCH 4/4] Add vsyscalls to feature-removal-schedule.txt

On Fri, Aug 12, 2011 at 2:25 PM, Andi Kleen <andi@...stfloor.org> wrote:
> Andy Lutomirski <luto@....EDU> writes:
>
>> In a couple years, we'll see how well we've done at eradicating vsyscall-using
>> binaries.  Hopefully we can then disable them by default.  We will probably
>> have to leave the option to enable them around forever.
>
> NACK NACK NACK!
>

It's already dropped from the version in tip/x86/vdso.

> this would break all old (old = meaning all today's) x86-64 installations.

Somewhat to my surprise, fully up-to-date Fedora 15 seems to work fine
with vsyscall=none, and I wouldn't be terribly surprised if a few of
the distributions starting making it the default sooner or later.  I
might do a followup patch to make the switch betweeen vsyscall=emulate
and vsyscall=none work as a sysctl.  (Switching from native to emulate
at runtime could be problematic.)

--Andy
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