WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#44: 
new file mode 100644

CHECK: Macro argument 'err' may be better as '(err)' to avoid precedence issues
#63: FILE: tools/testing/selftests/bpf/prog_tests/fd_htab_lookup.c:15:
+#define ERR_TO_RETVAL(where, err) ((void *)(long)(((where) << 12) | (-err)))

WARNING: line length of 91 exceeds 80 columns
#122: FILE: tools/testing/selftests/bpf/prog_tests/fd_htab_lookup.c:74:
+			inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL);

WARNING: line length of 87 exceeds 80 columns
#135: FILE: tools/testing/selftests/bpf/prog_tests/fd_htab_lookup.c:87:
+			err = bpf_map_update_elem(ctx->fd, &key, &inner_fd, BPF_EXIST);

WARNING: line length of 83 exceeds 80 columns
#156: FILE: tools/testing/selftests/bpf/prog_tests/fd_htab_lookup.c:108:
+		inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL);

WARNING: line length of 83 exceeds 80 columns
#218: FILE: tools/testing/selftests/bpf/prog_tests/fd_htab_lookup.c:170:
+		err = pthread_create(&tids[i + wr_nr], NULL, htab_lookup_fn, &ctx);

total: 0 errors, 5 warnings, 1 checks, 217 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 489c15209c3f ("selftests/bpf: Add test case for atomic update of fd htab") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 5 warnings, 1 checks, 217 lines checked