Merge branch 'iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...

[linux-2.6-omap-h63xx.git] / lib / Kconfig.debug

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 0626fa4856e6c80d45321606c025da5b28f83842..58bfe7e8faba0a6d94307945702ac298891497c4 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -912,6 +912,17 @@ config DYNAMIC_DEBUG
 
          See Documentation/dynamic-debug-howto.txt for additional information.
 
+config DMA_API_DEBUG
+       bool "Enable debugging of DMA-API usage"
+       depends on HAVE_DMA_API_DEBUG
+       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.
+
 source "samples/Kconfig"
 
 source "lib/Kconfig.kgdb"