linux-kernel - Build error in 6.16-rc1 in drivers/mfd/88pm860x-core.c

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Message-ID: <fbea65b5-2015-44db-a7d9-b53cba9833b3@googlemail.com>
Date: Mon, 9 Jun 2025 03:58:40 +0200
From: Peter Schneider <pschneider1968@...glemail.com>
To: LKML <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 haojian.zhuang@...vell.com, Mario Limonciello <superm1@...nel.org>,
 mario.limonciello@....com, Thomas Gleixner <tglx@...utronix.de>,
 jirislaby@...nel.org, Uwe Kleine-König
 <u.kleine-koenig@...gutronix.de>, Lee Jones <lee@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Build error in 6.16-rc1 in drivers/mfd/88pm860x-core.c

Hi all,

I just tried to test-build 6.16-rc1 on my good old 2-socket Ivy Bridge Xeon E5-2697 v2 
server, running Proxmox/Debian 12 (Bookworm) with GCC 12.2. I received the following build 
error:

   CC      drivers/mfd/88pm860x-core.o
drivers/mfd/88pm860x-core.c: In function 'device_irq_init':
drivers/mfd/88pm860x-core.c:576:29: error: unused variable 'node' [-Werror=unused-variable]
   576 |         struct device_node *node = i2c->dev.of_node;
       |                             ^~~~
cc1: all warnings being treated as errors
make[4]: *** [scripts/Makefile.build:287: drivers/mfd/88pm860x-core.o] Error 1
make[3]: *** [scripts/Makefile.build:554: drivers/mfd] Error 2
make[2]: *** [scripts/Makefile.build:554: drivers] Error 2
make[1]: *** [/usr/src/linux/Makefile:2006: .] Error 2
make: *** [Makefile:248: __sub-make] Error 2


My config file is attached. I always build with CONFIG_WERROR=y (same as I do in all of my 
regular test builds of Greg's stable-RC releases).

I'm not a Kernel developer nor a C programmer, I only have superficial knowledge of C (but 
I love to test and to tinker), so I don't quite understand this warning/error message. 
Becauses some lines below, the node variable is used as a paramter to the of_fwnode_handle 
macro (from include/linux/of.h):

         irq_domain_create_legacy(of_fwnode_handle(node), nr_irqs, chip->irq_base, 0,
                                  &pm860x_irq_domain_ops, chip);

Does that not count as variable usage to the compiler? Digging in somewhat deeper, I found 
that probably the patch from [1] is missing in 6.16 and should have been included?!

When I apply that patch, my build succeeds.

[1]: https://lore.kernel.org/all/20250602201008.1850418-1-superm1@kernel.org/


Beste Grüße,
Peter Schneider

-- 
Climb the mountain not to plant your flag, but to embrace the challenge,
enjoy the air and behold the view. Climb it so you can see the world,
not so the world can see you.                    -- David McCullough Jr.

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