linux-kernel - Re: [PATCH] clocksource/OF: remove invalid DT warnings when booting using ACPI

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Message-ID: <55BFA368.30609@linaro.org>
Date:	Mon, 03 Aug 2015 19:22:48 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Rob Herring <robh@...nel.org>, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] clocksource/OF: remove invalid DT warnings when booting
 using ACPI

On 08/03/2015 06:56 PM, Sudeep Holla wrote:
>
>
> On 03/08/15 17:45, Daniel Lezcano wrote:
>> On 07/23/2015 07:31 PM, Sudeep Holla wrote:
>>> Since both CONFIG_ACPI and CONFIG_CLKSRC_OF can be enabled on ARM64,
>>> we get this device tree warnings even when booting using ACPI which is
>>> not valid. We can use of_have_populated_dt to check if the device tree
>>> is populated or not and avoid spurious warning.
>>>
>>> This patch uses of_have_populated_dt to remove this non legitimate
>>> device
>>> tree warning when booting using ACPI tables.
>>>
>>> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
>>> Cc: Rob Herring <robh@...nel.org>
>>> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>> ---
>>>    drivers/clocksource/clksrc-of.c | 2 +-
>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/clocksource/clksrc-of.c
>>> b/drivers/clocksource/clksrc-of.c
>>> index 0093a8e49e14..47823a2d7220 100644
>>> --- a/drivers/clocksource/clksrc-of.c
>>> +++ b/drivers/clocksource/clksrc-of.c
>>> @@ -38,6 +38,6 @@ void __init clocksource_of_init(void)
>>>            init_func(np);
>>>            clocksources++;
>>>        }
>>> -    if (!clocksources)
>>> +    if (of_have_populated_dt() && !clocksources)
>>>            pr_crit("%s: no matching clocksources found\n", __func__);
>>>    }
>>
>> Hmm, even if the fix looks correct, it doesn't make sense to put it
>> there.
>>
>
> I thought of exactly the same at first. IMO, we are not fixing it at the
> source but at the call site instead which is fine and I don't have
> strong opinion on that. However I also came to know recently that
> CONFIG_OF can be now enabled on x86, so I preferred that.

I prefer to not call clocksource_of_init if the DT is not populated.


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