linux-kernel - [PATCH 1/2] x86/Kconfig: move and modify CONFIG

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Date:   Mon,  7 Feb 2022 19:29:39 +0100
From:   Mateusz Jończyk <mat.jonczyk@...pl>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-hwmon@...r.kernel.org
Cc:     Mateusz Jończyk <mat.jonczyk@...pl>,
        Pali Rohár <pali@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>
Subject: [PATCH 1/2] x86/Kconfig: move and modify CONFIG_I8K

In Kconfig, inside the "Processor type and features" menu, there is
the CONFIG_I8K option: "Dell i8k legacy laptop support". This is
very confusing - enabling CONFIG_I8K is not required for the kernel to
support old Dell laptops. This option is specific to the dell-smm-hwmon
driver, which mostly exports some hardware monitoring information and
allows the user to change fan speed.

This option is misplaced, so move CONFIG_I8K to drivers/hwmon/Kconfig,
where it belongs.

Also, modify the dependency order - change
        select SENSORS_DELL_SMM
to
        depends on SENSORS_DELL_SMM
as it is just a configuration option of dell-smm-hwmon. This includes
changing the option type from tristate to bool. It was tristate because
it could select CONFIG_SENSORS_DELL_SMM=m .

When running "make oldconfig" on configurations with
CONFIG_SENSORS_DELL_SMM enabled , this change will result in an
additional question (which could be printed several times during
bisecting). I think that tidying up the configuration is worth it,
though.

Next patch tweaks the description of CONFIG_I8K.

Signed-off-by: Mateusz Jończyk <mat.jonczyk@...pl>
Cc: Pali Rohár <pali@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Jean Delvare <jdelvare@...e.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: Mark Gross <markgross@...nel.org>
---
 arch/x86/Kconfig      | 17 -----------------
 drivers/hwmon/Kconfig | 15 +++++++++++++++
 2 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9f5bd41bf660..71d4ddd48c02 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1275,23 +1275,6 @@ config TOSHIBA
 	  Say Y if you intend to run this kernel on a Toshiba portable.
 	  Say N otherwise.
 
-config I8K
-	tristate "Dell i8k legacy laptop support"
-	depends on HWMON
-	depends on PROC_FS
-	select SENSORS_DELL_SMM
-	help
-	  This option enables legacy /proc/i8k userspace interface in hwmon
-	  dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
-	  temperature and allows controlling fan speeds of Dell laptops via
-	  System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
-	  it reports also power and hotkey status. For fan speed control is
-	  needed userspace package i8kutils.
-
-	  Say Y if you intend to run this kernel on old Dell laptops or want to
-	  use userspace package i8kutils.
-	  Say N otherwise.
-
 config X86_REBOOTFIXUPS
 	bool "Enable X86 board specific fixups for reboot"
 	depends on X86_32
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 8df25f1079ba..dd244aa747ad 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -505,6 +505,21 @@ config SENSORS_DELL_SMM
 	  When option I8K is also enabled this driver provides legacy /proc/i8k
 	  userspace interface for i8kutils package.
 
+config I8K
+	bool "Dell i8k legacy laptop support"
+	depends on SENSORS_DELL_SMM
+	help
+	  This option enables legacy /proc/i8k userspace interface in hwmon
+	  dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
+	  temperature and allows controlling fan speeds of Dell laptops via
+	  System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
+	  it reports also power and hotkey status. For fan speed control is
+	  needed userspace package i8kutils.
+
+	  Say Y if you intend to run this kernel on old Dell laptops or want to
+	  use userspace package i8kutils.
+	  Say N otherwise.
+
 config SENSORS_DA9052_ADC
 	tristate "Dialog DA9052/DA9053 ADC"
 	depends on PMIC_DA9052
-- 
2.25.1