linux-kernel - Re: [PATCH] firmware loader: log path to loaded firmwares

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Date:   Sun, 03 Nov 2019 12:55:18 -0500
From:   "Drew DeVault" <sir@...wn.com>
To:     "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:     "Luis Chamberlain" <mcgrof@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        <~sircmpwn/public-inbox@...ts.sr.ht>
Subject: Re: [PATCH] firmware loader: log path to loaded firmwares

On Sun Nov 3, 2019 at 6:50 PM Greg Kroah-Hartman wrote:
> And it's totally noisy :(
> 
> Please just make this a debug call, that way you can turn it on
> dynamically if you really want to see what firmware is attempting to be
> loaded.

The typical setup won't need more than say, 10-20 firmwares? On my
system I need 13, and 12 of them are just for AMDGPU. In the 20 minutes
since I rebooted to this kernel, it constitutes less than 1% of my dmesg
volume, and will only get less so over time unless I start hotplugging
stuff (in which case, their respective drivers are likely to make noise,
too). In practice, I don't think it'll be especially noisy.

On the other hand, enabling debug logs just to get this information
would generate heaps of noise for a little bit of signal. This use-case
isn't the exceptional case for me, on my systems I only install the
firmwares I need so this is something I would reach for every time I set
up a new system.

> Also, if you have a 'struct device' you should always use the dev_*()
> calls instead, which will show you exactly what device is asking for
> what.

Understood.