linux-kernel - [PATCH 1/6] AMD IOMMU: more verbose Kconfig description text

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Date:	Thu, 3 Jul 2008 19:35:06 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	mingo@...hat.com, tglx@...utronix.de
CC:	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	bhavna.sarathy@....com, robert.richter@....com,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 1/6] AMD IOMMU: more verbose Kconfig description text

This patch replaces the short description text for AMD IOMMU in Kconfig with a
more verbose one.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/Kconfig |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dc6425e..c31047a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -568,7 +568,15 @@ config AMD_IOMMU
 	select SWIOTLB
 	depends on X86_64 && PCI && ACPI
 	help
-	  Select this to get support for AMD IOMMU hardware in your system.
+	  With this option you can enable support for AMD IOMMU hardware in
+	  your system. An IOMMU is a hardware component which provides
+	  remapping of DMA memory accesses from devices. With an AMD IOMMU you
+	  can isolate the the DMA memory of different devices and protect the
+	  system from misbehaving device drivers or hardware.
+
+	  You can find out if your system has an AMD IOMMU if you look into
+	  your BIOS for an option to enable it or if you have an IVRS ACPI
+	  table.
 
 # need this always selected by IOMMU for the VIA workaround
 config SWIOTLB
-- 
1.5.3.7


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