You're right Alan, with the above patch, the type name for the pointer
is gone, here's generated BTF the same program:
[1] PTR '(anon)' type_id=3
[2] INT 'u8' size=1 bits_offset=0 nr_bits=8 encoding=(none)
[3] ARRAY '(anon)' type_id=2 index_type_id=4 nr_elems=4
[4] INT '__ARRAY_SIZE_TYPE__' size=4 bits_offset=0 nr_bits=32 encoding=(none)
[5] PTR '(anon)' type_id=6
[6] INT 'u32' size=4 bits_offset=0 nr_bits=32 encoding=(none)
[7] STRUCT 'map.Map.Def' size=24 vlen=3
'type' type_id=1 bits_offset=0
'key' type_id=5 bits_offset=64
'value' type_id=5 bits_offset=128
[8] VAR 'events' type_id=7, linkage=global
[9] PTR '(anon)' type_id=10
[10] ARRAY '(anon)' type_id=2 index_type_id=4 nr_elems=2
[11] PTR '(anon)' type_id=12
[12] ARRAY '(anon)' type_id=2 index_type_id=4 nr_elems=1
[13] STRUCT 'map.Map.Def' size=32 vlen=4
'type' type_id=9 bits_offset=0
'key' type_id=5 bits_offset=64
'value' type_id=5 bits_offset=128
'max_entries' type_id=11 bits_offset=192
[14] VAR 'my_pid' type_id=13, linkage=global
[15] FUNC_PROTO '(anon)' ret_type_id=16 vlen=1
'(anon)' type_id=17
[16] INT 'c_int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED
[17] PTR '(anon)' type_id=18
[18] STRUCT 'perf_event.test_perf_event_array__opaque_478' size=0 vlen=0
[19] FUNC 'test_perf_event_array' type_id=15 linkage=global
[20] FUNC_PROTO '(anon)' ret_type_id=21 vlen=1
'(anon)' type_id=21
[21] INT 'usize' size=8 bits_offset=0 nr_bits=64 encoding=(none)
[22] FUNC 'getauxvalImpl' type_id=20 linkage=global
[23] ARRAY '(anon)' type_id=2 index_type_id=4 nr_elems=3
[24] VAR '_license' type_id=23, linkage=global
[25] DATASEC '.maps' size=0 vlen=2
type_id=8 offset=0 size=24 (VAR 'events')
type_id=14 offset=0 size=32 (VAR 'my_pid')
[26] DATASEC 'license' size=0 vlen=1
type_id=24 offset=0 size=4 (VAR '_license')
