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 86 exceeds 80 columns
#127: FILE: tools/testing/selftests/bpf/prog_tests/iters.c:349:
+	prog = bpf_object__find_program_by_name(skel->obj, "test_bpf_iter_task_file");

WARNING: line length of 97 exceeds 80 columns
#146: FILE: tools/testing/selftests/bpf/prog_tests/iters.c:368:
+	child_pid = clone(task_file_test_process, stack + stack_size, CLONE_VM | SIGCHLD, &args);

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#187: 
new file mode 100644

CHECK: Comparison to NULL could be written "!task"
#213: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:22:
+	if (task == NULL) {

CHECK: Comparison to NULL could be written "!item"
#222: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:31:
+	if (item == NULL) {

CHECK: Comparison to NULL could be written "!item"
#233: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:42:
+	if (item == NULL) {

CHECK: Comparison to NULL could be written "!item"
#244: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:53:
+	if (item == NULL) {

CHECK: Comparison to NULL could be written "item"
#255: FILE: tools/testing/selftests/bpf/progs/iters_task_file.c:64:
+	if (item != NULL)

total: 0 errors, 4 warnings, 7 checks, 329 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 22989d22867c ("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, 4 warnings, 7 checks, 329 lines checked