linux-kernel - Re: [3.1 patch] x86: default to vsyscall=native

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Date:	Tue, 11 Oct 2011 08:22:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Lutomirski <luto@....edu>
Cc:	richard -rw- weinberger <richard.weinberger@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [3.1 patch] x86: default to vsyscall=native


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

> > Andrew?
> 
> I think I know what the root cause is and I have most of a patch to 
> fix it.  It doesn't compile (yet), it's a little less trivial than 
> I'd like for something this late in the -rc cycle, and it adds 16 
> bytes to thread_struct (ugh!).
> 
> I think I can make a follow-up patch that removes 32 bytes of 
> per-thread state to restore my karma, though, but that will 
> definitely not be 3.1 material.

Ok, i've queued up the vsyscall=native patch in tip:x86/urgent for 
now - we can re-try in v3.2 (perhaps) if a satisfactory solution is 
found.

Thanks,

	Ingo
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