linux-kernel - RE: Re[2]: 3.4-rc smpboot: do_boot

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Date:	Thu, 15 Oct 2015 16:21:16 -0400
From:	Donald Parsons <dparsons@...ghtdsl.net>
To:	"Brown, Len" <len.brown@...el.com>
Cc:	shrybman <shrybman@...savvy.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Re[2]: 3.4-rc smpboot: do_boot_cpu failed(-1) to wakeup CPU#1

On Thu, 2015-10-15 at 02:53 +0000, Brown, Len wrote:
> > > > Did you try reverting the "x86/smpboot: Remove
> > APIC.wait_for_init_deassert
> > > > and atomic init_deasserted"  patch?
> > >
> > > Yes, please let me know if reverting that patch helps you too.
> > 
> > How?  Please send a patch or git cmd(s).    I have the
> >     git/stable/linux-stable.git  on my PC.   Thanks.
> 
> git log calls it this:
> 
> commit 656bba306827a44ed73b3f93f75bb3147de17fae
> Author: Len Brown <len.brown@...el.com>
> Date:   Sun Aug 16 11:45:48 2015 -0400
> 
>     x86/smpboot: Remove APIC.wait_for_init_deassert and atomic init_deasserted
> 
> So you want to simply do this:
> 
> $ git revert 656bba306827a44ed73b3f93f75bb3147de17fae
> 
> build and test.

I did the revert in linux-stable (last tag being v4.3-rc4) gave a revert
description so it would be applied.

built and tested.  Result:  did not help, still missing the second core.

I am sure the revert happened but I am uncertain as to how to build in a
git tree.  I think I did it correctly
   cp .config into   linux-stable   tree
   edit Makefile to add -rev to: EXTRAVERSION = -rc4-rev
   make oldconfig
   make -j3 >> ../mak/mak_430-rc4-rev.log 2>&1 &

The before/after kernels are:
    3965280 Oct  4 15:20 vmlinuz-4.3.0-rc4
    3965408 Oct 15 13:45 vmlinuz-4.3.0-rc4-rev
The reverted vmlinuz is 128 bytes bigger;  .config's are identical.  I
see the revert adds back in some code so sizes seem appropriate.

Don

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