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docs: Trace events must not expect pointer dereferencing 

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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Stefan Hajnoczi 2011-04-14 18:24:50 +01:00
parent b4548fcc03
commit e6a750aab5
1 changed files with 5 additions and 0 deletions
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docs/tracing.txt
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@ -69,6 +69,11 @@ Trace events should use types as follows:
cannot include all user-defined struct declarations and it is therefore cannot include all user-defined struct declarations and it is therefore
necessary to use void * for pointers to structs. necessary to use void * for pointers to structs.
Pointers (including char *) cannot be dereferenced easily (or at all) in
some trace backends. If pointers are used, ensure they are meaningful by
themselves and do not assume the data they point to will be traced. Do
not pass in string arguments.
* For everything else, use primitive scalar types (char, int, long) with the * For everything else, use primitive scalar types (char, int, long) with the
appropriate signedness. appropriate signedness.