netdev - Re: [net-next 0/6] move CAN skb headroom content to skb extensions

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Message-ID: <f47126ee-8256-4077-a09c-47a1ed461f65@hartkopp.net>
Date: Thu, 29 Jan 2026 08:49:24 +0100
From: Oliver Hartkopp <socketcan@...tkopp.net>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
 linux-can@...r.kernel.org
Subject: Re: [net-next 0/6] move CAN skb headroom content to skb extensions

On 29.01.26 07:44, Marc Kleine-Budde wrote:
> On 28.01.2026 10:07:13, Marc Kleine-Budde wrote:
>> I'll do. In the mean time, please have a look at b4, it has support for
>> sending patches via a web hook.
> 
> Hooray for switching to b4!

Yes! Unfortunately one of the most relevant features does not work:

$ b4 prep --auto-to-cc
Will collect To: addresses using get_maintainer.pl
Will collect Cc: addresses using get_maintainer.pl
Traceback (most recent call last):
   File "/usr/bin/b4", line 8, in <module>
     sys.exit(cmd())
              ~~~^^
   File "/usr/lib/python3/dist-packages/b4/command.py", line 417, in cmd
     cmdargs.func(cmdargs)
     ~~~~~~~~~~~~^^^^^^^^^
   File "/usr/lib/python3/dist-packages/b4/command.py", line 83, in cmd_prep
     b4.ez.cmd_prep(cmdargs)
     ~~~~~~~~~~~~~~^^^^^^^^^
   File "/usr/lib/python3/dist-packages/b4/ez.py", line 2835, in cmd_prep
     auto_to_cc()
     ~~~~~~~~~~^^
   File "/usr/lib/python3/dist-packages/b4/ez.py", line 2655, in auto_to_cc
     logger.debug('added %s to seen', ltr.addr[1])
                                      ~~~~~~~~^^^
TypeError: 'NoneType' object is not subscriptable


$ b4 --version
0.14.2

While get_maintainer.pl itself works ...

$ scripts/get_maintainer.pl net/can/bcm.c
Oliver Hartkopp <socketcan@...tkopp.net> (maintainer:CAN NETWORK LAYER)
Marc Kleine-Budde <mkl@...gutronix.de> (maintainer:CAN NETWORK LAYER)
linux-can@...r.kernel.org (open list:CAN NETWORK LAYER)
linux-kernel@...r.kernel.org (open list)

At least posting via b4 relay works fine and downloading of the v2 
patchset you sent was comparably easy too.

Best regards,
Oliver