linux-kernel - [PATCH] kmemcheck: Disable SLUB and SLAB debugging when kmemcheck is enabled

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Date:	Mon, 23 Feb 2009 11:35:12 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org, vegard.nossum@...il.com,
	cl@...ux-foundation.org
Subject: [PATCH] kmemcheck: Disable SLUB and SLAB debugging when kmemcheck
	is enabled

From: Pekka Enberg <penberg@...helsinki.fi>

Enabling kmemcheck in Kconfig is a painful experience. Lets make it a
tad bit easier by inverting the dependencies to SLUB and SLAB debugging.
As kmemcheck is more powerful than slab debugging, disable the latter
functionality if an user enables kmemcheck.

Cc: Vegard Nossum <vegard.nossum@...il.com>
Cc: Christoph Lameter <cl@...ux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 arch/x86/Kconfig.debug |    2 +-
 init/Kconfig           |    2 +-
 lib/Kconfig.debug      |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index de186c5..3d1d593 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -276,7 +276,7 @@ menuconfig KMEMCHECK
 	bool "kmemcheck: trap use of uninitialized memory"
 	depends on X86
 	depends on !X86_USE_3DNOW
-	depends on (SLUB && !SLUB_DEBUG_ON) || (SLAB && !DEBUG_SLAB)
+	depends on SLUB || SLAB
 	depends on !CC_OPTIMIZE_FOR_SIZE
 	depends on !DEBUG_PAGEALLOC
 	depends on !FUNCTION_TRACER
diff --git a/init/Kconfig b/init/Kconfig
index f068071..36617a4 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -890,7 +890,7 @@ config PCI_QUIRKS
 config SLUB_DEBUG
 	default y
 	bool "Enable SLUB debugging support" if EMBEDDED
-	depends on SLUB && SYSFS
+	depends on SLUB && SYSFS && !KMEMCHECK
 	help
 	  SLUB has extensive debug support features. Disabling these can
 	  result in significant savings in code size. This also disables
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 29044f5..768e426 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -262,7 +262,7 @@ config DEBUG_OBJECTS_ENABLE_DEFAULT
 
 config DEBUG_SLAB
 	bool "Debug slab memory allocations"
-	depends on DEBUG_KERNEL && SLAB
+	depends on DEBUG_KERNEL && SLAB && !KMEMCHECK
 	help
 	  Say Y here to have the kernel do limited verification on memory
 	  allocation as well as poisoning memory on free to catch use of freed
-- 
1.5.4.3



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