linux-kernel - disabling CONFIG_LED

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Message-ID: <2835d02a-380b-6a3a-0e4d-abf07aee18bc@xs4all.nl>
Date:   Tue, 13 Oct 2020 11:24:15 +0200
From:   Udo van den Heuvel <udovdh@...all.nl>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: disabling CONFIG_LED_CLASS

Hello,

While looking at the 5.9 kernel config I noticed there is no easy way to
disable LED support in general.
There's this NEW_LEDS thing that is not shown, etc.
So I get:

# make oldconfig
scripts/kconfig/conf  --oldconfig Kconfig
*
* Restart config...
*
*
* LED Support
*
LED Support (NEW_LEDS) [Y/?] (NEW) y
  LED Class Support (LEDS_CLASS) [M/y/?] (NEW) n

CONFIG_LEDS_CLASS:

This option enables the LED sysfs class in /sys/class/leds.  You'll
need this to do anything useful with LEDs.  If unsure, say N.

Symbol: LEDS_CLASS [=m]
Type  : tristate
Defined at drivers/leds/Kconfig:17
  Prompt: LED Class Support
  Depends on: NEW_LEDS [=y]
  Location:
    -> Device Drivers
      -> LED Support (NEW_LEDS [=y])
Selected by [m]:
  - SND_HDA_GENERIC [=m] && SOUND [=y] && !UML && SND [=m] && SND_HDA
[=m] && SND_HDA_GENERIC_LEDS [=y]
Selected by [n]:
  - TS5500 [=n] && X86_32 [=n] && MELAN [=n]
  - ADB_PMU_LED [=n] && MACINTOSH_DRIVERS [=n] && PPC_PMAC && ADB_PMU [=n]
  - ATH5K [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_ATH [=n]
&& (PCI [=y] || ATH25) && MAC80211 [=n]
  - ATH9K [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_ATH [=n]
&& MAC80211 [=n] && HAS_DMA [=y]
  - ATH9K_HTC [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_ATH
[=n] && USB [=y] && MAC80211 [=n]
  - CARL9170_LEDS [=n] && NETDEVICES [=y] && WLAN [=n] &&
WLAN_VENDOR_ATH [=n] && CARL9170 [=n]
  - BRCMSMAC [=n] && NETDEVICES [=y] && WLAN [=n] &&
WLAN_VENDOR_BROADCOM [=n] && MAC80211 [=n] && BCMA_POSSIBLE [=y] &&
BCMA_DRIVER_GPIO [=n]
  - IWLEGACY [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_INTEL [=n]
  - INPUT_WISTRON_BTNS [=n] && !UML && INPUT [=y] && INPUT_MISC [=y] &&
X86_32 [=n]
  - SENSORS_APPLESMC [=n] && HWMON [=y] && INPUT [=y] && X86 [=y]
  - IR_REDRAT3 [=n] && RC_DEVICES [=n] && USB_ARCH_HAS_HCD [=y] &&
RC_CORE [=n]
  - IR_WINBOND_CIR [=n] && RC_DEVICES [=n] && (X86 [=y] && PNP [=y] ||
COMPILE_TEST [=n]) && RC_CORE [=n]
  - IR_TTUSBIR [=n] && RC_DEVICES [=n] && USB_ARCH_HAS_HCD [=y] &&
RC_CORE [=n]
  - BACKLIGHT_ADP8860 [=n] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE
[=y] && I2C [=y]
  - BACKLIGHT_ADP8870 [=n] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE
[=y] && I2C [=y]
  - BACKLIGHT_LM3639 [=n] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE
[=y] && I2C [=y]
  - SND_USB_TONEPORT [=n] && SOUND [=y] && !UML && SND [=m] && SND_USB
[=y] && USB [=y]
  - HID_LENOVO [=n] && INPUT [=y] && HID [=y]
  - HID_WACOM [=n] && INPUT [=y] && HID [=y] && USB_HID [=m]
  - HUAWEI_WMI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] &&
ACPI_BATTERY [=n] && ACPI_WMI [=n] && INPUT [=y]
  - ACER_WMI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI [=y]
&& BACKLIGHT_CLASS_DEVICE [=y] && SERIO_I8042 [=y] && INPUT [=y] &&
(RFKILL [=n] || RFKILL [=n]=n) && ACPI_WMI [=n]
  - ASUS_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
[=y] && BACKLIGHT_CLASS_DEVICE [=y] && INPUT [=y] && (RFKILL [=n] ||
RFKILL [=n]=n) && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n)
  - ASUS_WIRELESS [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
[=y] && INPUT [=y]
  - ASUS_WMI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI_WMI
[=n] && ACPI_BATTERY [=n] && INPUT [=y] && HWMON [=y] &&
BACKLIGHT_CLASS_DEVICE [=y] && (RFKILL [=n] || RFKILL [=n]=n) &&
HOTPLUG_PCI [=n] && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n)
  - EEEPC_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
[=y] && INPUT [=y] && (RFKILL [=n] || RFKILL [=n]=n) && (ACPI_VIDEO [=n]
|| ACPI_VIDEO [=n]=n) && HOTPLUG_PCI [=n] && BACKLIGHT_CLASS_DEVICE [=y]
  - DELL_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && DMI
[=y] && BACKLIGHT_CLASS_DEVICE [=y] && (ACPI_VIDEO [=n] || ACPI_VIDEO
[=n]=n) && (RFKILL [=n] || RFKILL [=n]=n) && SERIO_I8042 [=y] &&
DELL_SMBIOS [=n]
  - FUJITSU_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
[=y] && INPUT [=y] && BACKLIGHT_CLASS_DEVICE [=y] && (ACPI_VIDEO [=n] ||
ACPI_VIDEO [=n]=n)
  - HP_ACCEL [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && INPUT [=y]
&& ACPI [=y] && SERIO_I8042 [=y]
  - THINKPAD_ACPI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
[=y] && ACPI_BATTERY [=n] && INPUT [=y] && (RFKILL [=n] || RFKILL
[=n]=n) && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n) &&
BACKLIGHT_CLASS_DEVICE [=y]
  - SAMSUNG_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] &&
(RFKILL [=n] || RFKILL [=n]=n) && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n)
&& BACKLIGHT_CLASS_DEVICE [=y]
  - ACPI_TOSHIBA [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
[=y] && ACPI_WMI [=n] && BACKLIGHT_CLASS_DEVICE [=y] && INPUT [=y] &&
(SERIO_I8042 [=y] || SERIO_I8042 [=y]=n) && (ACPI_VIDEO [=n] ||
ACPI_VIDEO [=n]=n) && (RFKILL [=n] || RFKILL [=n]=n) && IIO [=n]
  - LG_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI [=y]
&& ACPI_WMI [=n] && INPUT [=y]
  - SYSTEM76_ACPI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI [=y]
  - TOPSTAR_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
[=y] && INPUT [=y]


And there is no 'n' option. None of the devices as dependencies (on the
left) are enabled.
SND_HDA_GENERIC_LEDS is automagically enabled and disabling it via vi is
no option.
So how do I disable this stuff?

Kind regards,
Udo