CHECK: extern prototypes should be avoided in .h files
#47: FILE: tools/testing/selftests/bpf/progs/crib_common.h:21:
+extern struct file *bpf_fget_task(struct task_struct *task, int fd) __ksym;

CHECK: extern prototypes should be avoided in .h files
#48: FILE: tools/testing/selftests/bpf/progs/crib_common.h:22:
+extern unsigned int bpf_get_file_ops_type(struct file *file) __ksym;

CHECK: extern prototypes should be avoided in .h files
#49: FILE: tools/testing/selftests/bpf/progs/crib_common.h:23:
+extern void bpf_put_file(struct file *file) __ksym;

CHECK: Comparison to NULL could be written "!task"
#98: FILE: tools/testing/selftests/bpf/progs/crib_files_success.c:82:
+	if (task == NULL) {

CHECK: Comparison to NULL could be written "!file"
#104: FILE: tools/testing/selftests/bpf/progs/crib_files_success.c:88:
+	if (file == NULL) {

CHECK: Comparison to NULL could be written "!file"
#112: FILE: tools/testing/selftests/bpf/progs/crib_files_success.c:96:
+	if (file == NULL) {

CHECK: Comparison to NULL could be written "!file"
#120: FILE: tools/testing/selftests/bpf/progs/crib_files_success.c:104:
+	if (file == NULL) {

CHECK: Comparison to NULL could be written "file"
#128: FILE: tools/testing/selftests/bpf/progs/crib_files_success.c:112:
+	if (file != NULL) {

total: 0 errors, 0 warnings, 8 checks, 89 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 0d47d2a6716d ("selftests/bpf: Add tests for struct file related CRIB kfuncs.") 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, 0 warnings, 8 checks, 89 lines checked