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1 | config HAVE_ARCH_KMEMCHECK |
2 | bool |
3 | |
4 | if HAVE_ARCH_KMEMCHECK |
5 | |
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 | |
94 | endif |
95 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9