kmemcheck: make kconfig accessible for other architectures

[mv-sheeva.git] / lib / Kconfig.kmemcheck

diff --git a/lib/Kconfig.kmemcheck b/lib/Kconfig.kmemcheck
new file mode 100644 (file)
index 0000000..603c81b
--- /dev/null
+++ b/lib/Kconfig.kmemcheck
@@ -0,0 +1,91 @@
+config HAVE_ARCH_KMEMCHECK
+       bool
+
+menuconfig KMEMCHECK
+       bool "kmemcheck: trap use of uninitialized memory"
+       depends on DEBUG_KERNEL
+       depends on !X86_USE_3DNOW
+       depends on SLUB || SLAB
+       depends on !CC_OPTIMIZE_FOR_SIZE
+       depends on !FUNCTION_TRACER
+       select FRAME_POINTER
+       select STACKTRACE
+       default n
+       help
+         This option enables tracing of dynamically allocated kernel memory
+         to see if memory is used before it has been given an initial value.
+         Be aware that this requires half of your memory for bookkeeping and
+         will insert extra code at *every* read and write to tracked memory
+         thus slow down the kernel code (but user code is unaffected).
+
+         The kernel may be started with kmemcheck=0 or kmemcheck=1 to disable
+         or enable kmemcheck at boot-time. If the kernel is started with
+         kmemcheck=0, the large memory and CPU overhead is not incurred.
+
+choice
+       prompt "kmemcheck: default mode at boot"
+       depends on KMEMCHECK
+       default KMEMCHECK_ONESHOT_BY_DEFAULT
+       help
+         This option controls the default behaviour of kmemcheck when the
+         kernel boots and no kmemcheck= parameter is given.
+
+config KMEMCHECK_DISABLED_BY_DEFAULT
+       bool "disabled"
+       depends on KMEMCHECK
+
+config KMEMCHECK_ENABLED_BY_DEFAULT
+       bool "enabled"
+       depends on KMEMCHECK
+
+config KMEMCHECK_ONESHOT_BY_DEFAULT
+       bool "one-shot"
+       depends on KMEMCHECK
+       help
+         In one-shot mode, only the first error detected is reported before
+         kmemcheck is disabled.
+
+endchoice
+
+config KMEMCHECK_QUEUE_SIZE
+       int "kmemcheck: error queue size"
+       depends on KMEMCHECK
+       default 64
+       help
+         Select the maximum number of errors to store in the queue. Since
+         errors can occur virtually anywhere and in any context, we need a
+         temporary storage area which is guarantueed not to generate any
+         other faults. The queue will be emptied as soon as a tasklet may
+         be scheduled. If the queue is full, new error reports will be
+         lost.
+
+config KMEMCHECK_SHADOW_COPY_SHIFT
+       int "kmemcheck: shadow copy size (5 => 32 bytes, 6 => 64 bytes)"
+       depends on KMEMCHECK
+       range 2 8
+       default 5
+       help
+         Select the number of shadow bytes to save along with each entry of
+         the queue. These bytes indicate what parts of an allocation are
+         initialized, uninitialized, etc. and will be displayed when an
+         error is detected to help the debugging of a particular problem.
+
+config KMEMCHECK_PARTIAL_OK
+       bool "kmemcheck: allow partially uninitialized memory"
+       depends on KMEMCHECK
+       default y
+       help
+         This option works around certain GCC optimizations that produce
+         32-bit reads from 16-bit variables where the upper 16 bits are
+         thrown away afterwards. This may of course also hide some real
+         bugs.
+
+config KMEMCHECK_BITOPS_OK
+       bool "kmemcheck: allow bit-field manipulation"
+       depends on KMEMCHECK
+       default n
+       help
+         This option silences warnings that would be generated for bit-field
+         accesses where not all the bits are initialized at the same time.
+         This may also hide some real bugs.
+