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

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Message-ID: <b765500b-cfde-45a8-8f7e-eead57db7dcf@googlemail.com>
Date: Mon, 9 Jun 2025 04:58:51 +0200
From: Peter Schneider <pschneider1968@...glemail.com>
To: Mario Limonciello <superm1@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 haojian.zhuang@...vell.com, 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: Re: Build error in 6.16-rc1 in drivers/mfd/88pm860x-core.c

Am 09.06.2025 um 04:31 schrieb Mario Limonciello:

> 
> On 6/8/25 8:58 PM, Peter Schneider wrote:
>>
>> 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? 
> It's not because there is a macro when CONFIG_OF is not defined that assigns it as NULL.  
> So to the compiler there is no variable use.

Ah, thanks for the explanation! I didn't quite see and grasp the nested #ifdefs depending 
on CONFIG_OF and the alternate macro definition for of_fwnode_handle when CONFIG_OF is not 
set. Now as I do, it makes perfect sense.

Beste Grüße,
Peter Schneider

-- 
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