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Date: Thu, 25 Aug 2011 13:00:30 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Andrew Lutomirski <luto@mit.edu>
CC: Arnaud Lacombe <lacombar@gmail.com>, Ingo Molnar <mingo@elte.hu>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [GIT PULL] x86/vdso changes for v3.1
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On 08/25/2011 12:55 PM, Andrew Lutomirski wrote:
> On Thu, Aug 25, 2011 at 3:51 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>> On 08/25/2011 12:47 PM, Arnaud Lacombe wrote:
>>>
>>> CPU: Intel QEMU Virtual CPU version 0.14.50 stepping 03
>>> About to apply_alternatives
>>> start=c13bee88 a=0 instr_offset=-3922530 instr=cpu_idle+0x26/0x60
>>> repl_offset=2336 repl=__alt_instructions_end+0x0/0x29f instrlen=5
>>> repllen=3
>>>   done
>>
>> Since this is a QEMU setup, could you share enough of the setup to
>> reproduce?
> 
> qemu-kvm -net none -kernel arch/x86/boot/bzImage -smp 2 -cpu host
> -nographic -append console=ttyS0
> 
> With Arnaud's 'dot-config' on the v3.1-rc3 tag.  Triggers instantly.
> It's definitely dependent on the config.
> 
> Is there any binutils magic to find out which file a particular
> address in .altinstructions came from?  I don't think there are
> meaningful symbols near it.
> 

addr2line might be able to tell you.

	-hpa