linux-kernel - [PATCH 01/16] dma-debug: add Kconfig entry

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 19 Jan 2009 15:46:48 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	mingo@...hat.com, linux-kernel@...r.kernel.org
CC:	fujita.tomonori@....ntt.co.jp, dwmw2@...radead.org,
	iommu@...ts.linux-foundation.org,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 01/16] dma-debug: add Kconfig entry

Impact: add a Kconfig entry for DMA-API debugging

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/Kconfig      |    2 ++
 lib/Kconfig.debug |   11 +++++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 550dab2..830c16a 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 4c9ae60..92120f7 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -906,6 +906,17 @@ 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


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/