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

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Date:	Thu, 28 Jun 2012 11:38:15 +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 09:48:52PM +1000, Benjamin Herrenschmidt wrote:
> On Wed, 2012-06-27 at 18:21 +0800, Zhao Chenhui wrote:
> > > 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.
> 
> Any reason not to just make it unconditional ? That sort of config
> option tend to just confuse things and make bug reports harder to sort
> out.... Also you decrease your test coverage.
> 
> Cheers,
> Ben.

The bootloader have done a timebase sync. If we do not need KEXEC or HOTPLUG_CPU feature,
it is unnecessary to do it again at boot time of kernel. I only compile the timebase sync routines
when users enable KEXEC or HOTPLUG_CPU.

-Chenhui

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