@@ -47,6 +47,7 @@ config BLACKFIN
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
+ select HAVE_DEBUG_STACKOVERFLOW
config GENERIC_CSUM
def_bool y
@@ -2,13 +2,6 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
- help
- This option will cause messages to be printed if free stack space
- drops below a certain limit.
-
config DEBUG_VERBOSE
bool "Verbose fault messages"
default y
@@ -14,6 +14,7 @@ config FRV
select ARCH_WANT_IPC_PARSE_VERSION
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
+ select HAVE_DEBUG_STACKOVERFLOW
config ZONE_DMA
bool
@@ -2,10 +2,6 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
-
config GDBSTUB
bool "Remote GDB kernel debugging"
depends on DEBUG_KERNEL
@@ -17,6 +17,7 @@ config M32R
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
+ select HAVE_DEBUG_STACKOVERFLOW
config SBUS
bool
@@ -2,13 +2,6 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
- help
- This option will cause messages to be printed if free stack space
- drops below a certain limit.
-
config DEBUG_PAGEALLOC
bool "Debug page memory allocations"
depends on DEBUG_KERNEL && BROKEN
@@ -43,6 +43,7 @@ config MIPS
select MODULES_USE_ELF_RELA if 64BIT
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
+ select HAVE_DEBUG_STACKOVERFLOW
menu "Machine selection"
@@ -67,15 +67,6 @@ config CMDLINE_OVERRIDE
Normally, you will choose 'N' here.
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
- help
- This option will cause messages to be printed if free stack space
- drops below a certain limit(2GB on MIPS). The debugging option
- provides another way to check stack overflow happened on kernel mode
- stack usually caused by nested interruption.
-
config SMTC_IDLE_HOOK_DEBUG
bool "Enable additional debug checks before going into CPU idle loop"
depends on DEBUG_KERNEL && MIPS_MT_SMTC
@@ -11,6 +11,7 @@ config MN10300
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
select MODULES_USE_ELF_RELA
+ select HAVE_DEBUG_STACKOVERFLOW
config AM33_2
def_bool n
@@ -2,10 +2,6 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
-
config DEBUG_DECOMPRESS_KERNEL
bool "Using serial port during decompressing kernel"
depends on DEBUG_KERNEL
@@ -146,6 +146,7 @@ config PPC
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_EXECVE
select CLONE_BACKWARDS
+ select HAVE_DEBUG_STACKOVERFLOW
config EARLY_PRINTK
bool
@@ -28,13 +28,6 @@ config PRINT_STACK_DEPTH
too small and stack traces cause important information to
scroll off the screen.
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
- help
- This option will cause messages to be printed if free stack space
- drops below a certain limit.
-
config HCALL_STATS
bool "Hypervisor call instrumentation"
depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
@@ -23,6 +23,7 @@ config TILE
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
+ select HAVE_DEBUG_STACKOVERFLOW
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
@@ -14,13 +14,6 @@ config EARLY_PRINTK
with klogd/syslogd. You should normally N here,
unless you want to debug such a crash.
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
- help
- This option will cause messages to be printed if free stack space
- drops below a certain limit.
-
config DEBUG_EXTRA_FLAGS
string "Additional compiler arguments when building with '-g'"
depends on DEBUG_INFO
@@ -115,6 +115,7 @@ config X86
select MODULES_USE_ELF_REL if X86_32
select MODULES_USE_ELF_RELA if X86_64
select CLONE_BACKWARDS if X86_32
+ select HAVE_DEBUG_STACKOVERFLOW
config INSTRUCTION_DECODER
def_bool y
@@ -59,16 +59,6 @@ config EARLY_PRINTK_DBGP
with klogd/syslogd or the X server. You should normally N here,
unless you want to debug such a crash. You need usb debug device.
-config DEBUG_STACKOVERFLOW
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL
- ---help---
- Say Y here if you want to check the overflows of kernel, IRQ
- and exception stacks. This option will cause messages of the
- stacks in detail when free stack space drops below a certain
- limit.
- If in doubt, say "N".
-
config X86_PTDUMP
bool "Export kernel pagetable layout to userspace via debugfs"
depends on DEBUG_KERNEL
@@ -1441,6 +1441,27 @@ config ASYNC_RAID6_TEST
If unsure, say N.
+config HAVE_DEBUG_STACKOVERFLOW
+ bool
+
+config DEBUG_STACKOVERFLOW
+ bool "Check for stack overflows"
+ depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
+ ---help---
+ Say Y here if you want to check for overflows of kernel, IRQ
+ and exception stacks (if your archicture uses them). This
+ option will show detailed messages if free stack space drops
+ below a certain limit.
+
+ These kinds of bugs usually occur when call-chains in the
+ kernel get too deep, especially when interrupts are
+ involved.
+
+ Use this in cases where you see apparently random memory
+ corruption, especially if it appears in 'struct thread_info'
+
+ If in doubt, say "N".
+
source "samples/Kconfig"
source "lib/Kconfig.kgdb"
Several architectures have similar stack debugging config options. They all pretty much do the same thing, some with slightly differing help text. This patch changes the architectures to instead enable a Kconfig boolean, and then use that boolean in the generic Kconfig.debug to present the actual menu option. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> --- linux-2.6.git-dave/arch/blackfin/Kconfig | 1 + linux-2.6.git-dave/arch/blackfin/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/frv/Kconfig | 1 + linux-2.6.git-dave/arch/frv/Kconfig.debug | 4 ---- linux-2.6.git-dave/arch/m32r/Kconfig | 1 + linux-2.6.git-dave/arch/m32r/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/mips/Kconfig | 1 + linux-2.6.git-dave/arch/mips/Kconfig.debug | 9 --------- linux-2.6.git-dave/arch/mn10300/Kconfig | 1 + linux-2.6.git-dave/arch/mn10300/Kconfig.debug | 4 ---- linux-2.6.git-dave/arch/powerpc/Kconfig | 1 + linux-2.6.git-dave/arch/powerpc/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/tile/Kconfig | 1 + linux-2.6.git-dave/arch/tile/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/x86/Kconfig | 1 + linux-2.6.git-dave/arch/x86/Kconfig.debug | 10 ---------- linux-2.6.git-dave/lib/Kconfig.debug | 21 +++++++++++++++++++++ 17 files changed, 29 insertions(+), 55 deletions(-)