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Steven Rostedt (Red Hat) authored
In preparation of having the multi buffer instances having their own trace option flags, the trace option files needs a way to not only pass in the flag they represent, but also the trace_array descriptor. A new field is added to the trace_array descriptor called trace_flags_index, which is a 32 byte character array representing a bit. This array is simply filled with the index of the array, where index_array[n] = n; Then the address of this array is passed to the file callbacks instead of the index of the flag index. Then to retrieve both the flag index and the trace_array descriptor: data is the passed in argument. index = *(unsigned char *)data; data -= index; /* Now data points to the address of the array in the trace_array */ tr = container_of(data, struct trace_array, trace_flags_index); Suggested-by:
Johannes Berg <johannes.berg@intel.com> Signed-off-by:
Steven Rostedt <rostedt@goodmis.org>
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