linux-kernel - Re: [PATCH v7 1/5] powerpc/85xx: implement hardware timebase sync

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Message-ID: <20120704034545.GA6196@localhost.localdomain>
Date:	Wed, 4 Jul 2012 11:45:45 +0800
From:	Zhao Chenhui <chenhui.zhao@...escale.com>
To:	Tabi Timur-B04825 <B04825@...escale.com>
CC:	Zhao Chenhui-B35336 <B35336@...escale.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Wood Scott-B07421 <B07421@...escale.com>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Li Yang-R58472 <r58472@...escale.com>, <leoli@...escale.com>
Subject: Re: [PATCH v7 1/5] powerpc/85xx: implement hardware timebase sync

On Tue, Jul 03, 2012 at 10:17:12PM -0500, Tabi Timur-B04825 wrote:
> Zhao Chenhui wrote:
> > If the guts variable is NULL, it indicates there is error in dts or kernel.
> > We should fix the error, rather than ignore it.
> 
> And that's why there's a warning message.  Crashing the kernel is not 
> going to fix anything.
> 

This error likely crashes the kenel somewhere.

> > Moreover, if smp_85xx_ops.give/take_timebase is NULL, kernel can not do the timebase sync.
> 
> Is that necessary for the kernel to boot?
> 

No. But in the cpu hotplug context, we need do the timebase sync.

-Chenhui

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