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0a4af3b0 PE |
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 |