WARNING: line length of 98 exceeds 80 columns
#39: FILE: tools/testing/selftests/bpf/bpf_experimental.h:593:
+extern int bpf_iter_task_file_new(struct bpf_iter_task_file *it, struct task_struct *task) __ksym;

CHECK: extern prototypes should be avoided in .h files
#39: FILE: tools/testing/selftests/bpf/bpf_experimental.h:593:
+extern int bpf_iter_task_file_new(struct bpf_iter_task_file *it, struct task_struct *task) __ksym;

CHECK: extern prototypes should be avoided in .h files
#42: FILE: tools/testing/selftests/bpf/bpf_experimental.h:596:
+extern void bpf_iter_task_file_destroy(struct bpf_iter_task_file *it) __ksym;

WARNING: line length of 96 exceeds 80 columns
#127: FILE: tools/testing/selftests/bpf/prog_tests/iters.c:349:
+	child_pid = clone(task_file_test_process, stack + stack_size, CLONE_VM | SIGCHLD, NULL);

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#161: 
new file mode 100644

WARNING: externs should be avoided in .c files
#179: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:14:
+extern const void pipefifo_fops __ksym;

WARNING: externs should be avoided in .c files
#180: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:15:
+extern const void socket_file_ops __ksym;

CHECK: Comparison to NULL could be written "!item"
#198: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:33:
+	if (item == NULL) {

CHECK: Comparison to NULL could be written "!item"
#214: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:49:
+	if (item == NULL) {

CHECK: Comparison to NULL could be written "!item"
#230: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:65:
+	if (item == NULL) {

CHECK: Comparison to NULL could be written "item"
#246: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:81:
+	if (item != NULL)

total: 0 errors, 5 warnings, 6 checks, 295 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 e34562efc3bc ("selftests/bpf: Add tests for open-coded style process file iterator") 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, 6 checks, 295 lines checked