Re: Patch "powerpc: Secondary CPUs must set cpu_callin_map after setting active and online" has been added to the 3.18-stable tree

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On Tue, 2015-01-13 at 15:46 -0800, Greg KH wrote:
> On Wed, Jan 14, 2015 at 10:32:17AM +1100, Michael Ellerman wrote:
> > On Tue, 2015-01-13 at 13:20 -0800, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
> > > This is a note to let you know that I've just added the patch titled
> > > 
> > >     powerpc: Secondary CPUs must set cpu_callin_map after setting active and online
> > > 
> > > to the 3.18-stable tree which can be found at:
> > >     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> > > 
> > > The filename of the patch is:
> > >      powerpc-secondary-cpus-must-set-cpu_callin_map-after-setting-active-and-online.patch
> > > and it can be found in the queue-3.18 subdirectory.
> > > 
> > > If you, or anyone else, feels it should not be added to the stable tree,
> > > please let <stable@xxxxxxxxxxxxxxx> know about it.
> > > 
> > > 
> > > From 7c5c92ed56d932b2c19c3f8aea86369509407d33 Mon Sep 17 00:00:00 2001
> > > From: Anton Blanchard <anton@xxxxxxxxx>
> > > Date: Tue, 9 Dec 2014 10:58:19 +1100
> > > Subject: powerpc: Secondary CPUs must set cpu_callin_map after setting active and online
> > 
> > Sorry, please drop this one, it had unintended consequences.
> 
> Is it reverted in Linus's tree?

Yep.

  commit 1be6f10f6f9caade3a053938cb80a2eed237e262
  Author: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
  Date:   Mon Dec 29 15:47:05 2014 +1100

    Revert "powerpc: Secondary CPUs must set cpu_callin_map after setting active and online"
    
    This reverts commit 7c5c92ed56d932b2c19c3f8aea86369509407d33.
    
    Although this did fix the bug it was aimed at, it also broke secondary
    startup on platforms that use give/take_timebase(). Unfortunately we
    didn't detect that while it was in next.
    
    Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>


Is there a better way to handle that? ie. should we have CC'ed the revert to stable?

cheers


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