Martin KaFai Lau 23127b33ec bpf: Create a new btf_name_by_offset() for non type name use case ... The current btf_name_by_offset() is returning "(anon)" type name for the offset == 0 case and "(invalid-name-offset)" for the out-of-bound offset case. It fits well for the internal BTF verbose log purpose which is focusing on type. For example, offset == 0 => "(anon)" => anonymous type/name. Returning non-NULL for the bad offset case is needed during the BTF verification process because the BTF verifier may complain about another field first before discovering the name_off is invalid. However, it may not be ideal for the newer use case which does not necessary mean type name. For example, when logging line_info in the BPF verifier in the next patch, it is better to log an empty src line instead of logging "(anon)". The existing bpf_name_by_offset() is renamed to __bpf_name_by_offset() and static to btf.c. A new bpf_name_by_offset() is added for generic context usage. It returns "\0" for name_off == 0 (note that btf->strings[0] is "\0") and NULL for invalid offset. It allows the caller to decide what is the best output in its context. The new btf_name_by_offset() is overlapped with btf_name_offset_valid(). Hence, btf_name_offset_valid() is removed from btf.h to keep the btf.h API minimal. The existing btf_name_offset_valid() usage in btf.c could also be replaced later. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2018-12-14 14:17:34 -08:00
..
arraymap.c
bpf_lru_list.c
bpf_lru_list.h
btf.c	bpf: Create a new btf_name_by_offset() for non type name use case	2018-12-14 14:17:34 -08:00
cgroup.c
core.c
cpumap.c
devmap.c
disasm.c
disasm.h
hashtab.c
helpers.c
inode.c
local_storage.c
lpm_trie.c
Makefile
map_in_map.c
map_in_map.h
offload.c
percpu_freelist.c
percpu_freelist.h
queue_stack_maps.c
reuseport_array.c
stackmap.c
syscall.c	bpf: remove obsolete prog->aux sanitation in bpf_insn_prepare_dump	2018-12-13 12:42:44 -08:00
tnum.c
verifier.c	bpf: Create a new btf_name_by_offset() for non type name use case	2018-12-14 14:17:34 -08:00
xskmap.c