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

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Message-ID: <20110817203517.GF16512@kernel.org>
Date:	Wed, 17 Aug 2011 22:35:17 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andrew Lutomirski <luto@....edu>
Cc:	Andi Kleen <andi@...stfloor.org>, 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


* Andrew Lutomirski <luto@....edu> wrote:

> 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.)

As long as no binaries break (emulation is fine) it's perfectly fine 
to phase out the executable vsyscall page and keep it as a data page 
only - and we can put that into feature-removal-schedule.txt just 
fine.

Thanks,

	Ingo
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