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

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Message-ID: <20120627102138.GB10476@localhost.localdomain>
Date:	Wed, 27 Jun 2012 18:21:38 +0800
From:	Zhao Chenhui <chenhui.zhao@...escale.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <scottwood@...escale.com>,
	<linux-kernel@...r.kernel.org>, <leoli@...escale.com>
Subject: Re: [PATCH v6 1/5] powerpc/85xx: implement hardware timebase sync

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 <chenhui.zhao@...escale.com>
> > Signed-off-by: Li Yang <leoli@...escale.com>
> > ---
> > 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

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