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Subject[PATCH 01/10] x86: add Kconfig entry for DMA-API debugging
Date
Impact: adds a new Kconfig option

Signed-off-by: Joerg Roedel <joerg.roedel@amd.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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