linux-kernel - Re: [PATCH] driver: of: overlay: demote message to warning

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Date:   Thu, 8 Sep 2022 12:55:39 -0500
From:   Frank Rowand <frowand.list@...il.com>
To:     Daniel Walker <danielwa@...co.com>
Cc:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Rob Herring <robh+dt@...nel.org>, xe-linux-external@...co.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] driver: of: overlay: demote message to warning

On 9/7/22 19:35, Daniel Walker wrote:
> On Wed, Sep 07, 2022 at 06:54:02PM -0500, Frank Rowand wrote:
>> On 9/7/22 18:07, Daniel Walker wrote:
>>> This warning message shows by default on the vast majority of overlays
>>> applied. Despite the text identifying this as a warning it is marked
>>> with the loglevel for error. At Cisco we filter the loglevels to only
>>> show error messages. We end up seeing this message but it's not really
>>> an error.
>>>
>>> For this reason it makes sense to demote the message to the warning
>>> loglevel.
>>>
>>> Cc: xe-linux-external@...co.com
>>> Signed-off-by: Daniel Walker <danielwa@...co.com>
>>> ---
>>>  drivers/of/overlay.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
>>> index bd8ff4df723d..4ae276ed9a65 100644
>>> --- a/drivers/of/overlay.c
>>> +++ b/drivers/of/overlay.c
>>> @@ -358,7 +358,7 @@ static int add_changeset_property(struct overlay_changeset *ovcs,
>>>  	}
>>>  
>>>  	if (!of_node_check_flag(target->np, OF_OVERLAY))
>>> -		pr_err("WARNING: memory leak will occur if overlay removed, property: %pOF/%s\n",
>>> +		pr_warn("WARNING: memory leak will occur if overlay removed, property: %pOF/%s\n",
>>>  		       target->np, new_prop->name);
>>>  
>>>  	if (ret) {
>>
>> NACK
>>
>> This is showing a real problem with the overlay.
> 
> What's the real problem ?
> 
> Daniel

A memory leak when the overlay is removed.

I'll send a patch to update the overlay file in Documumentation/devicetree/ to provide
more information about this.  If you don't see a patch by tomorrow, feel free to
ping me.

-Frank