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