From: Tudor Laurentiu <Laurentiu.Tudor@freescale.com>
To: <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] powerpc/time: When starting the decrementer don't zero the other bits in TCR
Date: Thu, 1 Sep 2011 18:38:21 +0300 [thread overview]
Message-ID: <4E5FA6ED.9010703@freescale.com> (raw)
In-Reply-To: <E9F5F1BB-305E-4AB5-A82F-C5840D24EEEC@kernel.crashing.org>
On 9/1/2011 4:56 PM, Kumar Gala wrote:
>
> On Sep 1, 2011, at 3:31 AM, Tudor Laurentiu wrote:
>
>> On 9/1/2011 9:27 AM, Kumar Gala wrote:
>>>
>>> On Aug 25, 2011, at 7:19 AM, Laurentiu Tudor wrote:
>>>
>>>> Clearing the other TCR bits might break code that sets them (e.g. to setup
>>>> the watchdog or fixed interval timer) before start_cpu_decrementer() gets
>>>> called.
>>>
>>> Can you be more specific about the case you're concerned about. I'm not sure we want to leave the FIT enabled if it was previously. Watchdog I could possibly see leaving alone.
>>
>> My particular case was this: I was experimenting with having the watchdog enabled during the boot process, in case something goes wrong before the normal watchdog mechanism kicks in. That didn't work without making this modification.
>> Then, thinking that having a function start_cpu_decrementer() touching the other timers and not only the decrementer as its name implies might not be good. So I submitted this patch to the public mailing list to let the community decide if it's useful.
>
> So I think renaming the function is fine, and I think not touching the watchdog bits is also reasonable. So if you update the patch along those lines I think we can push in. I do want to make sure that the FIT is disabled as we dont expect it.
how about:
static void setup_cpu_timers()
?
> Probably add a comment about how care needs to be taken if the wathchdog is enable be firmware or a previous kernel.
OK.
next prev parent reply other threads:[~2011-09-01 15:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-25 12:19 [PATCH] powerpc/time: When starting the decrementer don't zero the other bits in TCR Laurentiu Tudor
2011-09-01 6:27 ` Kumar Gala
2011-09-01 8:31 ` Tudor Laurentiu
2011-09-01 13:56 ` Kumar Gala
2011-09-01 15:38 ` Tudor Laurentiu [this message]
2011-09-01 18:49 ` Kumar Gala
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