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Diffstat (limited to 'lib/Kconfig.kmemcheck')
-rw-r--r-- | lib/Kconfig.kmemcheck | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/lib/Kconfig.kmemcheck b/lib/Kconfig.kmemcheck new file mode 100644 index 000000000000..603c81b66549 --- /dev/null +++ b/lib/Kconfig.kmemcheck | |||
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1 | config HAVE_ARCH_KMEMCHECK | ||
2 | bool | ||
3 | |||
4 | menuconfig KMEMCHECK | ||
5 | bool "kmemcheck: trap use of uninitialized memory" | ||
6 | depends on DEBUG_KERNEL | ||
7 | depends on !X86_USE_3DNOW | ||
8 | depends on SLUB || SLAB | ||
9 | depends on !CC_OPTIMIZE_FOR_SIZE | ||
10 | depends on !FUNCTION_TRACER | ||
11 | select FRAME_POINTER | ||
12 | select STACKTRACE | ||
13 | default n | ||
14 | help | ||
15 | This option enables tracing of dynamically allocated kernel memory | ||
16 | to see if memory is used before it has been given an initial value. | ||
17 | Be aware that this requires half of your memory for bookkeeping and | ||
18 | will insert extra code at *every* read and write to tracked memory | ||
19 | thus slow down the kernel code (but user code is unaffected). | ||
20 | |||
21 | The kernel may be started with kmemcheck=0 or kmemcheck=1 to disable | ||
22 | or enable kmemcheck at boot-time. If the kernel is started with | ||
23 | kmemcheck=0, the large memory and CPU overhead is not incurred. | ||
24 | |||
25 | choice | ||
26 | prompt "kmemcheck: default mode at boot" | ||
27 | depends on KMEMCHECK | ||
28 | default KMEMCHECK_ONESHOT_BY_DEFAULT | ||
29 | help | ||
30 | This option controls the default behaviour of kmemcheck when the | ||
31 | kernel boots and no kmemcheck= parameter is given. | ||
32 | |||
33 | config KMEMCHECK_DISABLED_BY_DEFAULT | ||
34 | bool "disabled" | ||
35 | depends on KMEMCHECK | ||
36 | |||
37 | config KMEMCHECK_ENABLED_BY_DEFAULT | ||
38 | bool "enabled" | ||
39 | depends on KMEMCHECK | ||
40 | |||
41 | config KMEMCHECK_ONESHOT_BY_DEFAULT | ||
42 | bool "one-shot" | ||
43 | depends on KMEMCHECK | ||
44 | help | ||
45 | In one-shot mode, only the first error detected is reported before | ||
46 | kmemcheck is disabled. | ||
47 | |||
48 | endchoice | ||
49 | |||
50 | config KMEMCHECK_QUEUE_SIZE | ||
51 | int "kmemcheck: error queue size" | ||
52 | depends on KMEMCHECK | ||
53 | default 64 | ||
54 | help | ||
55 | Select the maximum number of errors to store in the queue. Since | ||
56 | errors can occur virtually anywhere and in any context, we need a | ||
57 | temporary storage area which is guarantueed not to generate any | ||
58 | other faults. The queue will be emptied as soon as a tasklet may | ||
59 | be scheduled. If the queue is full, new error reports will be | ||
60 | lost. | ||
61 | |||
62 | config KMEMCHECK_SHADOW_COPY_SHIFT | ||
63 | int "kmemcheck: shadow copy size (5 => 32 bytes, 6 => 64 bytes)" | ||
64 | depends on KMEMCHECK | ||
65 | range 2 8 | ||
66 | default 5 | ||
67 | help | ||
68 | Select the number of shadow bytes to save along with each entry of | ||
69 | the queue. These bytes indicate what parts of an allocation are | ||
70 | initialized, uninitialized, etc. and will be displayed when an | ||
71 | error is detected to help the debugging of a particular problem. | ||
72 | |||
73 | config KMEMCHECK_PARTIAL_OK | ||
74 | bool "kmemcheck: allow partially uninitialized memory" | ||
75 | depends on KMEMCHECK | ||
76 | default y | ||
77 | help | ||
78 | This option works around certain GCC optimizations that produce | ||
79 | 32-bit reads from 16-bit variables where the upper 16 bits are | ||
80 | thrown away afterwards. This may of course also hide some real | ||
81 | bugs. | ||
82 | |||
83 | config KMEMCHECK_BITOPS_OK | ||
84 | bool "kmemcheck: allow bit-field manipulation" | ||
85 | depends on KMEMCHECK | ||
86 | default n | ||
87 | help | ||
88 | This option silences warnings that would be generated for bit-field | ||
89 | accesses where not all the bits are initialized at the same time. | ||
90 | This may also hide some real bugs. | ||
91 | |||