kernel: (NULL device *): hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info()

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Do you happen to know if this bug also exists in Bionic?

Still exist in Bionic

Have tested the 4.16 vanilla kernel; and the hwmon warning is gone now.

Test with 4.15.0-14-generic kernel

oem@ubuntu:~$ journalctl -b | grep hwmon_device_register
Apr 03 16:22:25 ubuntu kernel: (NULL device *): hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().

oem@ubuntu:/boot$ sudo grep hwmon_device_register abi-4.15.0-14-generic
EXPORT_SYMBOL_GPL vmlinux 0x00000000 devm_hwmon_device_register_with_groups
EXPORT_SYMBOL_GPL vmlinux 0x00000000 devm_hwmon_device_register_with_info
EXPORT_SYMBOL_GPL vmlinux 0x00000000 hwmon_device_register # <<<<<<<<<<<<<<<<<<<<<
EXPORT_SYMBOL_GPL vmlinux 0x00000000 hwmon_device_register_with_groups
EXPORT_SYMBOL_GPL vmlinux 0x00000000 hwmon_device_register_with_info

#5 comment addon

Greping like in #7 the vanilla 4.16 kernel also expose:

EXPORT_SYMBOL_GPL vmlinux 0x00000000 hwmon_device_register

but greping journalctl does not show that warning; maybe it is simply silenced.

kernel 4.15.0-15

kernel: (NULL device *): hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info()

Is this bug harmless?

This bug still exists. My system ubuntu uname -a:

Linux vanoy 4.15.0-70-generic #79-Ubuntu SMP Tue Nov 12 10:36:11 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Harmless. There are still 40+ drivers using this API in current mainline kernel v5.4.

Yep, agreeing tho You-Sheng.
People are seeing this when e.g. using lm-sensores as it will trigger the hwmon interfaces which have plenty of these old calls.

Here an example list:
Documentation/hwmon/hwmon-kernel-api.rst:27: hwmon_device_register_with_groups(struct device *dev, const char *name,
Documentation/hwmon/hwmon-kernel-api.rst:32: devm_hwmon_device_register_with_groups(struct device *dev,
Documentation/hwmon/hwmon-kernel-api.rst:37: hwmon_device_register_with_info(struct device *dev,
Documentation/hwmon/hwmon-kernel-api.rst:43: devm_hwmon_device_register_with_info(struct device *dev,
Documentation/hwmon/hwmon-kernel-api.rst:53:hwmon_device_register_with_groups registers a hardware monitoring device.
Documentation/hwmon/hwmon-kernel-api.rst:58:hwmon_device_register_with_groups will attach this pointer to the newly
Documentation/hwmon/hwmon-kernel-api.rst:62:hwmon_device_register_with_groups creates the hwmon device with name attribute
Documentation/hwmon/hwmon-kernel-api.rst:67:devm_hwmon_device_register_with_groups is similar to
Documentation/hwmon/hwmon-kernel-api.rst:68:hwmon_device_register_with_groups. However, it is device managed, meaning the
Documentation/hwmon/hwmon-kernel-api.rst:71:hwmon_device_register_with_info is the most comprehensive and preferred means
Documentation/hwmon/hwmon-kernel-api.rst:78:devm_hwmon_device_register_with_info is similar to
Documentation/hwmon/hwmon-kernel-api.rst:79:hwmon_device_register_with_info. However, it is device managed, meaning the
Documentation/hwmon/hwmon-kernel-api.rst:86:hwmon_device_register_with_groups or hwmon_device_register_with_info.
Documentation/hwmon/hwmon-kernel-api.rst:90:the call to devm_hwmon_device_register_with_groups or
Documentation/hwmon/hwmon-kernel-api.rst:91:hwmon_device_register_with_info and if the automatic (device managed)
Documentation/hwmon/hwmon-kernel-api.rst:98:Using devm_hwmon_device_register_with_info()
Documentation/hwmon/hwmon-kernel-api.rst:101:hwmon_device_register_with_info() registers a hardware monitoring device.
Documentation/hwmon/hwmon-kernel-api.rst:339:hwmon_device_register_with_info or devm_hwmon_device_register_with_info,
Documentation/hwmon/submitting-patches.rst:127:* Use devm_hwmon_device_register_with_info() or, if your driver needs a remove
Documentation/hwmon/submitting-patches.rst:128: function, hwmon_device_register_with_info() to register your driver with the
Documentation/hwmon/submitting-patches.rst:130: possible. Do not use hwmon_device_register().
drivers/net/phy/nxp-tja11xx.c:349: devm_hwmon_device_register_with_info(dev, priv->hwmon_name,
drivers/net/phy/aquantia_hwmon.c:244: hwmon_dev = devm_hwmon_device_register_with_info(dev, hwmon_name,
drivers/net/phy/sfp.c:1173: sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
drivers/net/phy/marvell10g.c:191: priv->hwmon_dev = devm_hwmon_device_register_with_info(dev,
drivers/net/phy/marvell.c:2047: priv->hwmon_dev = devm_hwmon_device_register_with_info(
drivers/net/ethernet/sfc/mcdi_mon.c:505: hwmon->device = hwmon_device_register_with_groups(&efx->pci_dev->dev,
drivers/net/ethernet/emulex/benet/be_main.c:6014: ...