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Message-ID: <20071025200434.GD14501@uranus.ravnborg.org>
Date: Thu, 25 Oct 2007 22:04:34 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
LKML <linux-kernel@...r.kernel.org>,
linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: [PATCH 3/6] x86: unification of i386 and x86_64 Kconfig.debug
>From 16b853f53463e43bfce341965ac10a78a3755a14 Mon Sep 17 00:00:00 2001
From: Randy Dunlap <rdunlap@...otime.net>
Date: Wed, 24 Oct 2007 15:50:43 -0700
Subject: [PATCH] x86: unification of i386 and x86_64 Kconfig.debug
Adding proper dependencies so the two Kconfig.debug files
are now identical.
Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
---
arch/i386/Kconfig.debug | 51 ++++++++++++++++++++++++++++-------
arch/x86_64/Kconfig | 4 ---
arch/{i386 => x86_64}/Kconfig.debug | 51 ++++++++++++++++++++++++++++-------
3 files changed, 82 insertions(+), 24 deletions(-)
copy arch/{i386 => x86_64}/Kconfig.debug (65%)
diff --git a/arch/i386/Kconfig.debug b/arch/i386/Kconfig.debug
index f03531e..970b2de 100644
--- a/arch/i386/Kconfig.debug
+++ b/arch/i386/Kconfig.debug
@@ -1,14 +1,14 @@
menu "Kernel hacking"
config TRACE_IRQFLAGS_SUPPORT
- bool
- default y
+ def_bool y
source "lib/Kconfig.debug"
config EARLY_PRINTK
bool "Early printk" if EMBEDDED && DEBUG_KERNEL
default y
+ depends on X86_32
help
Write kernel log output directly into the VGA buffer or to a serial
port.
@@ -37,10 +37,12 @@ config DEBUG_STACK_USAGE
comment "Page alloc debug is incompatible with Software Suspend on i386"
depends on DEBUG_KERNEL && HIBERNATION
+ depends on X86_32
config DEBUG_PAGEALLOC
bool "Debug page memory allocations"
depends on DEBUG_KERNEL && !HIBERNATION && !HUGETLBFS
+ depends on X86_32
help
Unmap pages from the kernel linear mapping after free_pages().
This results in a large slowdown, but helps to find certain types
@@ -59,6 +61,7 @@ config DEBUG_RODATA
config 4KSTACKS
bool "Use 4Kb for kernel stacks instead of 8Kb"
depends on DEBUG_KERNEL
+ depends on X86_32
help
If you say Y here the kernel will use a 4Kb stacksize for the
kernel stack attached to each process/thread. This facilitates
@@ -67,22 +70,50 @@ config 4KSTACKS
will also use IRQ stacks to compensate for the reduced stackspace.
config X86_FIND_SMP_CONFIG
- bool
+ def_bool y
depends on X86_LOCAL_APIC || X86_VOYAGER
- default y
+ depends on X86_32
config X86_MPPARSE
- bool
+ def_bool y
depends on X86_LOCAL_APIC && !X86_VISWS
- default y
+ depends on X86_32
config DOUBLEFAULT
default y
bool "Enable doublefault exception handler" if EMBEDDED
+ depends on X86_32
+ help
+ This option allows trapping of rare doublefault exceptions that
+ would otherwise cause a system to silently reboot. Disabling this
+ option saves about 4k and might cause you much additional grey
+ hair.
+
+config IOMMU_DEBUG
+ bool "Enable IOMMU debugging"
+ depends on IOMMU && DEBUG_KERNEL
+ depends on X86_64
help
- This option allows trapping of rare doublefault exceptions that
- would otherwise cause a system to silently reboot. Disabling this
- option saves about 4k and might cause you much additional grey
- hair.
+ Force the IOMMU to on even when you have less than 4GB of
+ memory and add debugging code. On overflow always panic. And
+ allow to enable IOMMU leak tracing. Can be disabled at boot
+ time with iommu=noforce. This will also enable scatter gather
+ list merging. Currently not recommended for production
+ code. When you use it make sure you have a big enough
+ IOMMU/AGP aperture. Most of the options enabled by this can
+ be set more finegrained using the iommu= command line
+ options. See Documentation/x86_64/boot-options.txt for more
+ details.
+
+config IOMMU_LEAK
+ bool "IOMMU leak tracing"
+ depends on DEBUG_KERNEL
+ depends on IOMMU_DEBUG
+ help
+ Add a simple leak tracer to the IOMMU code. This is useful when you
+ are debugging a buggy device driver that leaks IOMMU mappings.
+
+#config X86_REMOTE_DEBUG
+# bool "kgdb debugging stub"
endmenu
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 308970a..1bc0268 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -97,10 +97,6 @@ config X86_CMPXCHG
bool
default y
-config EARLY_PRINTK
- bool
- default y
-
config GENERIC_ISA_DMA
bool
default y
diff --git a/arch/i386/Kconfig.debug b/arch/x86_64/Kconfig.debug
similarity index 65%
copy from arch/i386/Kconfig.debug
copy to arch/x86_64/Kconfig.debug
index f03531e..970b2de 100644
--- a/arch/i386/Kconfig.debug
+++ b/arch/x86_64/Kconfig.debug
@@ -1,14 +1,14 @@
menu "Kernel hacking"
config TRACE_IRQFLAGS_SUPPORT
- bool
- default y
+ def_bool y
source "lib/Kconfig.debug"
config EARLY_PRINTK
bool "Early printk" if EMBEDDED && DEBUG_KERNEL
default y
+ depends on X86_32
help
Write kernel log output directly into the VGA buffer or to a serial
port.
@@ -37,10 +37,12 @@ config DEBUG_STACK_USAGE
comment "Page alloc debug is incompatible with Software Suspend on i386"
depends on DEBUG_KERNEL && HIBERNATION
+ depends on X86_32
config DEBUG_PAGEALLOC
bool "Debug page memory allocations"
depends on DEBUG_KERNEL && !HIBERNATION && !HUGETLBFS
+ depends on X86_32
help
Unmap pages from the kernel linear mapping after free_pages().
This results in a large slowdown, but helps to find certain types
@@ -59,6 +61,7 @@ config DEBUG_RODATA
config 4KSTACKS
bool "Use 4Kb for kernel stacks instead of 8Kb"
depends on DEBUG_KERNEL
+ depends on X86_32
help
If you say Y here the kernel will use a 4Kb stacksize for the
kernel stack attached to each process/thread. This facilitates
@@ -67,22 +70,50 @@ config 4KSTACKS
will also use IRQ stacks to compensate for the reduced stackspace.
config X86_FIND_SMP_CONFIG
- bool
+ def_bool y
depends on X86_LOCAL_APIC || X86_VOYAGER
- default y
+ depends on X86_32
config X86_MPPARSE
- bool
+ def_bool y
depends on X86_LOCAL_APIC && !X86_VISWS
- default y
+ depends on X86_32
config DOUBLEFAULT
default y
bool "Enable doublefault exception handler" if EMBEDDED
+ depends on X86_32
+ help
+ This option allows trapping of rare doublefault exceptions that
+ would otherwise cause a system to silently reboot. Disabling this
+ option saves about 4k and might cause you much additional grey
+ hair.
+
+config IOMMU_DEBUG
+ bool "Enable IOMMU debugging"
+ depends on IOMMU && DEBUG_KERNEL
+ depends on X86_64
help
- This option allows trapping of rare doublefault exceptions that
- would otherwise cause a system to silently reboot. Disabling this
- option saves about 4k and might cause you much additional grey
- hair.
+ Force the IOMMU to on even when you have less than 4GB of
+ memory and add debugging code. On overflow always panic. And
+ allow to enable IOMMU leak tracing. Can be disabled at boot
+ time with iommu=noforce. This will also enable scatter gather
+ list merging. Currently not recommended for production
+ code. When you use it make sure you have a big enough
+ IOMMU/AGP aperture. Most of the options enabled by this can
+ be set more finegrained using the iommu= command line
+ options. See Documentation/x86_64/boot-options.txt for more
+ details.
+
+config IOMMU_LEAK
+ bool "IOMMU leak tracing"
+ depends on DEBUG_KERNEL
+ depends on IOMMU_DEBUG
+ help
+ Add a simple leak tracer to the IOMMU code. This is useful when you
+ are debugging a buggy device driver that leaks IOMMU mappings.
+
+#config X86_REMOTE_DEBUG
+# bool "kgdb debugging stub"
endmenu
--
1.5.3.4.1157.g0e74-dirty
-
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