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kmemcheck: make kconfig accessible for other architectures
The Kconfig options of kmemcheck are hidden under arch/x86 which makes porting to other architectures harder. To fix that, move the Kconfig bits to lib/Kconfig.kmemcheck and introduce a CONFIG_HAVE_ARCH_KMEMCHECK config option that architectures can define. Signed-off-by: Pekka Enberg <[email protected]> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <[email protected]>
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@@ -996,3 +996,5 @@ config DMA_API_DEBUG | |
| source "samples/Kconfig" | ||
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| source "lib/Kconfig.kgdb" | ||
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| source "lib/Kconfig.kmemcheck" | ||
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| @@ -0,0 +1,91 @@ | ||
| config HAVE_ARCH_KMEMCHECK | ||
| bool | ||
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| 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). | ||
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| 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. | ||
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| 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. | ||
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| config KMEMCHECK_DISABLED_BY_DEFAULT | ||
| bool "disabled" | ||
| depends on KMEMCHECK | ||
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| config KMEMCHECK_ENABLED_BY_DEFAULT | ||
| bool "enabled" | ||
| depends on KMEMCHECK | ||
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| 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. | ||
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| endchoice | ||
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| 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. | ||
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| 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. | ||
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| 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. | ||
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| 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. | ||
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