Subject: Re: [PATCH v6 1/5] powerpc/85xx: implement hardware timebase sync

From: Zhao Chenhui <[email-masked]>
Date: Wed, 27 Jun 2012 18:21:38 +0800

On Wed, Jun 27, 2012 at 08:10:34AM +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2012-06-26 at 18:25 +0800, Zhao Chenhui wrote:
> > Do hardware timebase sync. Firstly, stop all timebases, and transfer
> > the timebase value of the boot core to the other core. Finally,
> > start all timebases.
> > 
> > Only apply to dual-core chips, such as MPC8572, P2020, etc.
> > 
> > Signed-off-by: Zhao Chenhui <[email-masked]>
> > Signed-off-by: Li Yang <[email-masked]>
> > ---
> > Changes for v6:
> >  * added 85xx_TB_SYNC
> >  * added isync() after set_tb()
> >  * removed extra entries from mpc85xx_smp_guts_ids
> 
> What's that CONFIG option for ?
> 
> Cheers,
> Ben.

This option is to guard the timebase sync routines. It is selected
when KEXEC or HOTPLUG_CPU is enabled on Freescale Book-E platforms.

-Chenhui