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

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Message-ID: <20220916225646.GK4320@zorba>
Date:   Fri, 16 Sep 2022 15:56:46 -0700
From:   Daniel Walker <danielwa@...co.com>
To:     Frank Rowand <frowand.list@...il.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 Fri, Sep 16, 2022 at 05:47:54PM -0500, Frank Rowand wrote:
> > 
> > Maybe you could add a flag or other indicator which would indicate the overlay will never be
> > removed. Then your code could rely on this property to inform on if the author
> > has consider the removal issues related to overlays.
> 
> No.  I guess I wasn't clear enough above, where I said:
> 
>    "And I will not accept a
>     change that suppresses the message if there is no expectation to remove the
>     overlay."
> 
> There are multiple reasons for this, but the most fundamental is that if a
> new overlay is not removable, then any overlay already applied can not be
> removed (because overlays must be removed in the reverse order that they
> are applied).  It would be incredibly bad architecture to allow an overlay
> to block another overlay from being removed.

So how about an option to turn off removable overlays entirely? As far as I can
tell it's not used currently by the tiny number of implementation I've seen.

Cisco doesn't need it, and we could have a smaller kernel without it.

The issue is that the error log on blast is log level abuse in my opinion. If
there's no way to fix it, it should not be an error.

Daniel