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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 6 Oct 2011 11:34:41 -0700
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Subject: Re: [3.1 patch] x86: default to vsyscall=native
To: Andrew Lutomirski <luto@mit.edu>
Cc: richard -rw- weinberger <richard.weinberger@gmail.com>,
        Adrian Bunk <bunk@stusta.de>, "H. Peter Anvin" <hpa@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        x86@kernel.org, linux-kernel@vger.kernel.org
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On Thu, Oct 6, 2011 at 11:16 AM, Andrew Lutomirski <luto@mit.edu> wrote:
>
> Fixing it will be annoying because the attached fancier version needs
> to work, too.  I could implement the whole mess in software, but it
> might be nicer to arrange for uaccess errors to stash some information
> somewhere (like in the thread_struct cr2 variable).

That should be easy enough to do. Just add it to the
"fixup_exception()" case in no_context().

                Linus