tracing_map_add

函数名称：tracing_map_add_field

函数原型：static int tracing_map_add_field(struct tracing_map *map, tracing_map_cmp_fn_t cmp_fn)

返回类型：int

参数：

类型	参数	名称
struct tracing_map *	map
tracing_map_cmp_fn_t	cmp_fn

**调用者**
名称	描述
tracing_map_add_sum_field	racing_map_add_sum_field - Add a field describing a tracing_map sum@map: The tracing_map Add a sum field to the key and return the index identifying it in* the map and associated tracing_map_elts
tracing_map_add_key_field	racing_map_add_key_field - Add a field describing a tracing_map key@map: The tracing_map@offset: The offset within the key@cmp_fn: The comparison function that will be used to sort on the key Let the map know there is a key and that if it's used as a

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