linux-kernel - [PATCH 01/10] x86: add Kconfig entry for DMA-API debugging

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Message-ID: <1227284770-19215-2-git-send-email-joerg.roedel@amd.com>
Date:	Fri, 21 Nov 2008 17:26:01 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	iommu@...ts.linux-foundation.org,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 01/10] x86: add Kconfig entry for DMA-API debugging

Impact: adds a new Kconfig option

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/Kconfig.debug |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 2a3dfbd..d4fafd5 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -162,6 +162,18 @@ config DOUBLEFAULT
 	  option saves about 4k and might cause you much additional grey
 	  hair.
 
+config DMA_API_DEBUG
+	default n
+	bool "Enable debugging of DMA-API usage"
+	depends on X86
+	help
+	  Enable this option to debug the use of the DMA API by device drivers.
+	  With this option you will be able to detect common bugs in device
+	  drivers like double-freeing of DMA mappings or freeing mappings that
+	  were never allocated.
+	  This option causes a performance degredation. Use only if you want to
+	  debug device drivers. If unsure, say N.
+
 config IOMMU_DEBUG
 	bool "Enable IOMMU debugging"
 	depends on GART_IOMMU && DEBUG_KERNEL
-- 
1.5.6.4


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