linux-kernel - [PATCH v3 5/7] x86/Kconfig: Document CONFIG_PCI

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Message-Id: <20250321-x86_x2apic-v3-5-b0cbaa6fa338@ixit.cz>
Date: Fri, 21 Mar 2025 21:48:47 +0100
From: David Heidelberg via B4 Relay <devnull+david.ixit.cz@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 Kees Cook <kees@...nel.org>, Jonathan Cameron <jic23@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>, 
 linux-iio@...r.kernel.org, 
 Mateusz Jończyk <mat.jonczyk@...pl>, 
 David Heidelberg <david@...t.cz>
Subject: [PATCH v3 5/7] x86/Kconfig: Document CONFIG_PCI_MMCONFIG

From: Mateusz Jończyk <mat.jonczyk@...pl>

This configuration option had no help text, so add it.

CONFIG_EXPERT is enabled on some distribution kernels, so people using a
distribution kernel's configuration as a starting point will see this
option.

Signed-off-by: Mateusz Jończyk <mat.jonczyk@...pl>
Signed-off-by: David Heideberg <david@...t.cz>
---
 arch/x86/Kconfig | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fbc9ba30fd1cbfb574399a0632b9f77876ba84a8..64a1e00619df95f559488e3004558a7b0f653df3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2914,6 +2914,19 @@ config PCI_MMCONFIG
 	default y
 	depends on PCI && (ACPI || JAILHOUSE_GUEST)
 	depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)
+	help
+	  Add support for accessing the PCI configuration space as a memory
+	  mapped area. It is the recommended method if the system supports
+	  this (it must have PCI Express and ACPI for it to be available).
+
+	  In the unlikely case that enabling this configuration option causes
+	  problems, the mechanism can be switched off with the 'pci=nommconf'
+	  command line parameter.
+
+	  Say 'n' only if you are sure that your platform does not support this
+	  access method or you have problems caused by it.
+
+	  Say 'y' otherwise.

 config PCI_OLPC
 	def_bool y

-- 
2.49.0