| config HAVE_ARCH_KMEMCHECK |
| bool |
| |
| if HAVE_ARCH_KMEMCHECK |
| |
| 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. |
| |
| endif |
