linux-kernel - Re: [GIT PULL] x86/vdso changes for v3.1

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Message-ID: <CAObL_7HLpji6xDcBAmwUXBQuahLLVzQXAfYz_gXufUqj_cDzeQ@mail.gmail.com>
Date:	Thu, 25 Aug 2011 15:55:22 -0400
From:	Andrew Lutomirski <luto@....edu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Arnaud Lacombe <lacombar@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86/vdso changes for v3.1

On Thu, Aug 25, 2011 at 3:51 PM, H. Peter Anvin <hpa@...or.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.

--Andy
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