projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 0a4af3b0 PE |
1 | config HAVE_ARCH_KMEMCHECK |
| 2 | bool | |
| 3 | ||
| d33c9a49 SAS |
4 | if HAVE_ARCH_KMEMCHECK |
| 5 | ||
| 0a4af3b0 PE |
6 | menuconfig KMEMCHECK |
| 7 | bool "kmemcheck: trap use of uninitialized memory" | |
| 8 | depends on DEBUG_KERNEL | |
| 9 | depends on !X86_USE_3DNOW | |
| 10 | depends on SLUB || SLAB | |
| 11 | depends on !CC_OPTIMIZE_FOR_SIZE | |
| 12 | depends on !FUNCTION_TRACER | |
| 13 | select FRAME_POINTER | |
| 14 | select STACKTRACE | |
| 15 | default n | |
| 16 | help | |
| 17 | This option enables tracing of dynamically allocated kernel memory | |
| 18 | to see if memory is used before it has been given an initial value. | |
| 19 | Be aware that this requires half of your memory for bookkeeping and | |
| 20 | will insert extra code at *every* read and write to tracked memory | |
| 21 | thus slow down the kernel code (but user code is unaffected). | |
| 22 | ||
| 23 | The kernel may be started with kmemcheck=0 or kmemcheck=1 to disable | |
| 24 | or enable kmemcheck at boot-time. If the kernel is started with | |
| 25 | kmemcheck=0, the large memory and CPU overhead is not incurred. | |
| 26 | ||
| 27 | choice | |
| 28 | prompt "kmemcheck: default mode at boot" | |
| 29 | depends on KMEMCHECK | |
| 30 | default KMEMCHECK_ONESHOT_BY_DEFAULT | |
| 31 | help | |
| 32 | This option controls the default behaviour of kmemcheck when the | |
| 33 | kernel boots and no kmemcheck= parameter is given. | |
| 34 | ||
| 35 | config KMEMCHECK_DISABLED_BY_DEFAULT | |
| 36 | bool "disabled" | |
| 37 | depends on KMEMCHECK | |
| 38 | ||
| 39 | config KMEMCHECK_ENABLED_BY_DEFAULT | |
| 40 | bool "enabled" | |
| 41 | depends on KMEMCHECK | |
| 42 | ||
| 43 | config KMEMCHECK_ONESHOT_BY_DEFAULT | |
| 44 | bool "one-shot" | |
| 45 | depends on KMEMCHECK | |
| 46 | help | |
| 47 | In one-shot mode, only the first error detected is reported before | |
| 48 | kmemcheck is disabled. | |
| 49 | ||
| 50 | endchoice | |
| 51 | ||
| 52 | config KMEMCHECK_QUEUE_SIZE | |
| 53 | int "kmemcheck: error queue size" | |
| 54 | depends on KMEMCHECK | |
| 55 | default 64 | |
| 56 | help | |
| 57 | Select the maximum number of errors to store in the queue. Since | |
| 58 | errors can occur virtually anywhere and in any context, we need a | |
| 59 | temporary storage area which is guarantueed not to generate any | |
| 60 | other faults. The queue will be emptied as soon as a tasklet may | |
| 61 | be scheduled. If the queue is full, new error reports will be | |
| 62 | lost. | |
| 63 | ||
| 64 | config KMEMCHECK_SHADOW_COPY_SHIFT | |
| 65 | int "kmemcheck: shadow copy size (5 => 32 bytes, 6 => 64 bytes)" | |
| 66 | depends on KMEMCHECK | |
| 67 | range 2 8 | |
| 68 | default 5 | |
| 69 | help | |
| 70 | Select the number of shadow bytes to save along with each entry of | |
| 71 | the queue. These bytes indicate what parts of an allocation are | |
| 72 | initialized, uninitialized, etc. and will be displayed when an | |
| 73 | error is detected to help the debugging of a particular problem. | |
| 74 | ||
| 75 | config KMEMCHECK_PARTIAL_OK | |
| 76 | bool "kmemcheck: allow partially uninitialized memory" | |
| 77 | depends on KMEMCHECK | |
| 78 | default y | |
| 79 | help | |
| 80 | This option works around certain GCC optimizations that produce | |
| 81 | 32-bit reads from 16-bit variables where the upper 16 bits are | |
| 82 | thrown away afterwards. This may of course also hide some real | |
| 83 | bugs. | |
| 84 | ||
| 85 | config KMEMCHECK_BITOPS_OK | |
| 86 | bool "kmemcheck: allow bit-field manipulation" | |
| 87 | depends on KMEMCHECK | |
| 88 | default n | |
| 89 | help | |
| 90 | This option silences warnings that would be generated for bit-field | |
| 91 | accesses where not all the bits are initialized at the same time. | |
| 92 | This may also hide some real bugs. | |
| 93 | ||
| d33c9a49 | 94 | endif |