netdev - Re: [PATCH net-next 2/2] net: mctp: Add MCTP USB transport driver

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Message-ID: <2025020716-dandruff-slacked-f6b1@gregkh>
Date: Fri, 7 Feb 2025 10:10:57 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Jeremy Kerr <jk@...econstruct.com.au>
Cc: Matt Johnston <matt@...econstruct.com.au>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Santosh Puranik <spuranik@...dia.com>
Subject: Re: [PATCH net-next 2/2] net: mctp: Add MCTP USB transport driver

On Fri, Feb 07, 2025 at 04:49:05PM +0800, Jeremy Kerr wrote:
> Hi Greg,
> 
> Just a check here:
> 
> > > +               dev_err(&mctp_usb->usbdev->dev, "%s: urb status: %d\n",
> > > +                       __func__, status);
> > 
> > This could flood the logs, are you sure you need it at dev_err()
> > level?
> > 
> > And __func__ is redundant, it's present in dev_*() calls already.
> 
> am I missing something then?
> 
>    [  146.130170] usb 2-1: short packet (hdr) 6
> 
> emitted from:
> 
>     dev_dbg(&mctp_usb->usbdev->dev,
>             "short packet (hdr) %d\n",
>             hdr->len);
> 
> Seems like we get the driver name, but not the function.
> 
> I'm happy to remove the __func__ output either way, but I will also
> make the logs a little more descriptive for context, if we don't have
> func data.

Please read Documentation/admin-guide/dynamic-debug-howto.rst, it shows
how to get the function information from the dev_dbg() lines at runtime.

In short:
	$ alias ddcmd='echo $* > /proc/dynamic_debug/control'
	# add function to all enabled messages
	$ ddcmd '+f'

hope this helps,

greg k-h