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tracing: Add __field_struct macro for TRACE_EVENT()
Currently the __field() macro in TRACE_EVENT is only good for primitive values, such as integers and pointers, but it fails on complex data types such as structures or unions. This is because the __field() macro determines if the variable is signed or not with the test of: (((type)(-1)) < (type)1) Unfortunately, that fails when type is a structure. Since trace events should support structures as fields a new macro is created for such a case called __field_struct() which acts exactly the same as __field() does but it does not do the signed type check and just uses a constant false for that answer. Cc: Tony Luck <tony.luck@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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@ -44,6 +44,12 @@
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#undef __field_ext
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#define __field_ext(type, item, filter_type) type item;
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#undef __field_struct
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#define __field_struct(type, item) type item;
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type) type item;
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#undef __array
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#define __array(type, item, len) type item[len];
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@ -122,6 +128,12 @@
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#undef __field_ext
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#define __field_ext(type, item, filter_type)
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#undef __field_struct
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#define __field_struct(type, item)
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type)
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#undef __array
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#define __array(type, item, len)
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@ -315,9 +327,21 @@ static struct trace_event_functions ftrace_event_type_funcs_##call = { \
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if (ret) \
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return ret;
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), \
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0, filter_type); \
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if (ret) \
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return ret;
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#undef __field
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#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
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#undef __field_struct
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#define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
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#undef __array
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#define __array(type, item, len) \
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do { \
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@ -379,6 +403,12 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
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#undef __field_ext
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#define __field_ext(type, item, filter_type)
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#undef __field_struct
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#define __field_struct(type, item)
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type)
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#undef __array
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#define __array(type, item, len)
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@ -550,6 +580,9 @@ static inline notrace int ftrace_get_offsets_##call( \
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#undef __field
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#define __field(type, item)
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#undef __field_struct
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#define __field_struct(type, item)
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#undef __array
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#define __array(type, item, len)
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@ -56,7 +56,8 @@
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* struct: This defines the way the data will be stored in the ring buffer.
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* There are currently two types of elements. __field and __array.
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* a __field is broken up into (type, name). Where type can be any
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* type but an array.
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* primitive type (integer, long or pointer). __field_struct() can
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* be any static complex data value (struct, union, but not an array).
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* For an array. there are three fields. (type, name, size). The
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* type of elements in the array, the name of the field and the size
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* of the array.
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