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 550dab22daa14b492d88258c9eb8ae7498d76ec1..830c16a2b801d38795139b941f277011e760ba37 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -106,3 +106,5 @@ 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 1bcf9cd4baa08a85633e5758721b7ef21f4df787..d9cbada7e2f8206d77de67c31600dffdc1d9d186 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -902,6 +902,17 @@ 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"