dma-debug: add Kconfig entry
Impact: add a Kconfig entry for DMA-API debugging
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index 550dab2..830c16a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -106,3 +106,5 @@
The <linux/clk.h> calls support software clock gating and
thus are a key power management tool on many systems.
+config HAVE_DMA_API_DEBUG
+ bool
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1bcf9cd..d9cbada 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -902,6 +902,17 @@
debugging for all modules. This mode can be turned off via the above
disable command.
+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"