2009-02-26 19:38:56 +00:00
|
|
|
config HAVE_ARCH_KMEMCHECK
|
|
|
|
|
bool
|
|
|
|
|
|
2009-06-28 11:10:19 +00:00
|
|
|
if HAVE_ARCH_KMEMCHECK
|
|
|
|
|
|
2009-02-26 19:38:56 +00:00
|
|
|
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.
|
|
|
|
|
|
2009-06-28 11:10:19 +00:00
|
|
|
endif
|
