WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#25: 
new file mode 100644

WARNING: line length of 83 exceeds 80 columns
#45: FILE: tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c:16:
+static void subtest_kmem_cache_iter_check_task_struct(struct kmem_cache_iter *skel)

CHECK: Alignment should match open parenthesis
#48: FILE: tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c:19:
+	LIBBPF_OPTS(bpf_test_run_opts, opts,
+		.flags = 0,  /* Run it with the current task */

CHECK: Comparison to NULL could be written "!fp"
#70: FILE: tools/testing/selftests/bpf/prog_tests/kmem_cache_iter.c:41:
+	if (fp == NULL) {

CHECK: No space is necessary after a cast
#210: FILE: tools/testing/selftests/bpf/progs/kmem_cache_iter.c:31:
+extern void bpf_rcu_read_lock(void) __ksym;

CHECK: No space is necessary after a cast
#211: FILE: tools/testing/selftests/bpf/progs/kmem_cache_iter.c:32:
+extern void bpf_rcu_read_unlock(void) __ksym;

WARNING: externs should be avoided in .c files
#212: FILE: tools/testing/selftests/bpf/progs/kmem_cache_iter.c:33:
+extern struct kmem_cache *bpf_get_kmem_cache(u64 addr) __ksym;

CHECK: Comparison to NULL could be written "!r"
#234: FILE: tools/testing/selftests/bpf/progs/kmem_cache_iter.c:55:
+		if (r == NULL)

WARNING: line length of 82 exceeds 80 columns
#244: FILE: tools/testing/selftests/bpf/progs/kmem_cache_iter.c:65:
+			bpf_map_update_elem(&slab_hash, &s, r->name, BPF_NOEXIST);

CHECK: Comparison to NULL could be written "!s"
#260: FILE: tools/testing/selftests/bpf/progs/kmem_cache_iter.c:81:
+	if (s == NULL) {

total: 0 errors, 4 warnings, 6 checks, 232 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 f2b00f66d6de ("selftests/bpf: Add a test for kmem_cache_iter") 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, 6 checks, 232 lines checked