linux-kernel - Re: [PATCH can] can: fix build dependency

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Message-ID: <f188b330-8bf5-4509-a2fc-712c20160167@kernel.org>
Date: Wed, 17 Dec 2025 23:24:05 +0100
From: Vincent Mailhol <mailhol@...nel.org>
To: Marc Kleine-Budde <mkl@...gutronix.de>, Arnd Bergmann <arnd@...db.de>,
 Oliver Hartkopp <socketcan@...tkopp.net>
Cc: kernel@...gutronix.de, linux-can@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH can] can: fix build dependency

On 17/12/2025 at 10:45, Marc Kleine-Budde wrote:
> Arnd Bergmann's patch [1] fixed the build dependency problem introduced by
> bugfix commit cb2dc6d2869a ("can: Kconfig: select CAN driver infrastructure
> by default"). This ended up as commit 6abd4577bccc ("can: fix build
> dependency"), but I broke Arnd's fix by removing a dependency that we
> thought was superfluous.

And my comment subverted you into doing so. I think half of the blame goes to me
here.

> [1] https://lore.kernel.org/all/20251204100015.1033688-1-arnd@kernel.org/
> 
> Meanwhile the problem was also found by intel's kernel test robot,
> complaining about undefined symbols:
> 
> | ERROR: modpost: "m_can_class_unregister" [drivers/net/can/m_can/m_can_platform.ko] undefined!
> | ERROR: modpost: "m_can_class_free_dev" [drivers/net/can/m_can/m_can_platform.ko] undefined!
> | ERROR: modpost: "m_can_class_allocate_dev" [drivers/net/can/m_can/m_can_platform.ko] undefined!
> | ERROR: modpost: "m_can_class_get_clocks" [drivers/net/can/m_can/m_can_platform.ko] undefined!
> | ERROR: modpost: "m_can_class_register" [drivers/net/can/m_can/m_can_platform.ko] undefined!
> 
> To fix this problem, add the missing dependency again.
> 
> Cc: Vincent Mailhol <mailhol@...nel.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202512132253.vO9WFDJK-lkp@intel.com/
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Closes: https://lore.kernel.org/all/7427949a-ea7d-4854-9fe4-e01db7d878c7@app.fastmail.com/
> Fixes: 6abd4577bccc ("can: fix build dependency")
> Fixes: cb2dc6d2869a ("can: Kconfig: select CAN driver infrastructure by default")
> Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>

Acked-by: Vincent Mailhol <mailhol@...nel.org>


Yours sincerely,
Vincent Mailhol