linux-kernel - [PATCH v2 10/10] x86/Kconfig: remove CONFIG_ISA

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Date:   Sun, 11 Sep 2022 10:47:11 +0200
From:   Mateusz Jończyk <mat.jonczyk@...pl>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Mateusz Jończyk <mat.jonczyk@...pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>
Subject: [PATCH v2 10/10] x86/Kconfig: remove CONFIG_ISA_BUS

CONFIG_ISA_BUS was used only as a dependency for a single Industrial IO
driver: CONFIG_CIO_DAC ("Measurement Computing CIO-DAC IIO driver"). At
least grepping the kernel source for "ISA_BUS" did not provide any other
meaningful results.

There are more configuration options that select CONFIG_ISA_BUS_API, but
did not depend on CONFIG_ISA_BUS. Most of these are for Industrial IO and
GPIO drivers.

Signed-off-by: Mateusz Jończyk <mat.jonczyk@...pl>
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: x86@...nel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: William Breathitt Gray <vilhelm.gray@...il.com>
Acked-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
v2: add "Acked by: William Breathitt Gray"

 arch/x86/Kconfig        | 11 -----------
 drivers/iio/dac/Kconfig |  2 +-
 2 files changed, 1 insertion(+), 12 deletions(-)


diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4612c356da4c..c8218d310d55 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2759,17 +2759,6 @@ config PCI_CNB20LE_QUIRK
 
 	  You should say N unless you know you need this.
 
-config ISA_BUS
-	bool "ISA bus support on modern systems" if EXPERT
-	help
-	  Expose ISA bus device drivers and options available for selection and
-	  configuration. Enable this option if your target machine has an ISA
-	  bus. ISA is an older system, displaced by PCI and newer bus
-	  architectures -- if your target machine is modern, it probably does
-	  not have an ISA bus.
-
-	  If unsure, say N.
-
 # x86_64 have no ISA slots, but can have ISA-style DMA.
 config ISA_DMA_API
 	bool "ISA-style DMA support" if (X86_64 && EXPERT)
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 80521bd28d0f..e32245c013b0 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -275,7 +275,7 @@ config AD8801
 
 config CIO_DAC
 	tristate "Measurement Computing CIO-DAC IIO driver"
-	depends on X86 && (ISA_BUS || PC104)
+	depends on X86
 	select ISA_BUS_API
 	help
 	  Say yes here to build support for the Measurement Computing CIO-DAC
-- 
2.25.1