| 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 |