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

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Date:	Mon, 03 Aug 2015 17:56:38 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Sudeep Holla <sudeep.holla@....com>, Rob Herring <robh@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] clocksource/OF: remove invalid DT warnings when booting
 using ACPI



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.

Regards,
Sudeep
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