linux-kernel - Re: Apparent Kconfig bug for Maxim 77650 driver

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Message-ID: <CAMRc=MdM+OknEhguq5SxkOqyp0M62TU3T1+iMwvooHsDXU8Fqg@mail.gmail.com>
Date:   Fri, 3 Jan 2020 12:43:30 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Paul Gazzillo <paul@...zz.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Lee Jones <lee.jones@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Apparent Kconfig bug for Maxim 77650 driver

pt., 3 sty 2020 o 06:45 Paul Gazzillo <paul@...zz.com> napisał(a):
>
> It seems there is a Kconfig issue that causing a linking error for drivers/mfd/max77650.c.  It happens when CONFIG_MFD_MAX77650 is set (which controls drivers/mfd/max77650.c), but CONFIG_REGMAP_IRQ is not.  CONFIG_REMAP_IRQ controls drivers/base/regmap/regmap-irq.c, which has functions called by max77650.c.
>
> In drivers/mfd/Kconfig, it looks like CONFIG_MFD_MAX77650 is meant to have "select CONFIG_REGMAP_IRQ" like several other configuration options from the same Kconfig file.
>
> Steps to reproduce the bug for next-20191220 (also happens on other versions, e.g., v5.4.4):
>
>   1. make allnoconfig  # using x86
>   2. make menuconfig
>     a. Enable device drivers->i2c support
>     b. Enable device drivers->device tree and open firmware support
>     c. Enable device drivers->multifunction devices->maxim MAX77650
>   3. make  # should have a build error when linking vmlinux
>
> This is the build error I get:
>
>     ld: drivers/mfd/max77650.o: in function `max77650_i2c_probe':
>     max77650.c:(.text+0xcb): undefined reference to `devm_regmap_add_irq_chip'
>     ld: max77650.c:(.text+0xdb): undefined reference to `regmap_irq_get_domain'
>     make: *** [Makefile:1079: vmlinux] Error 1
>
> Is this a real bug or am I doing something wrong?
>
> Best,
> Paul

It's a bug, thanks for reporting. I just sent out a fix.

Best regards,
Bartosz Golaszewski

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