Impact: add a Kconfig entry for DMA-API debugging
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/Kconfig | 2 ++
lib/Kconfig.debug | 11 +++++++++++
2 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 2e13aa2..068554c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -103,3 +103,5 @@ config HAVE_CLK
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 2e75478..cba5778 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -899,6 +899,17 @@ config DYNAMIC_PRINTK_DEBUG
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"
--
1.5.6.4
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