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authorJoerg Roedel <joerg.roedel@amd.com>2009-01-09 12:14:24 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-03-05 14:36:50 +0100
commit5ee00bd4691e7364bb7b62e2068d473cd5cb9320 (patch)
tree5223b3e5baadea873e0b2b5e6b40236de27bd864
parent0bd5c4f7c874cf48ff7904dcf8a59988c8fea0e8 (diff)
dma-debug: add Kconfig entry
Impact: add a Kconfig entry for DMA-API debugging Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
-rw-r--r--arch/Kconfig2
-rw-r--r--lib/Kconfig.debug11
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 550dab22daa1..830c16a2b801 100644
--- 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 1bcf9cd4baa0..d9cbada7e2f8 100644
--- 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"