WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#74: FILE: tools/testing/selftests/bpf/progs/arena_list.c:33:
+const volatile bool nonsleepable = false;

CHECK: No space is necessary after a cast
#82: FILE: tools/testing/selftests/bpf/progs/arena_list.c:46:
+void bpf_rcu_read_lock(void) __ksym;

CHECK: No space is necessary after a cast
#83: FILE: tools/testing/selftests/bpf/progs/arena_list.c:47:
+void bpf_rcu_read_unlock(void) __ksym;

CHECK: spaces preferred around that '*' (ctx:WxV)
#122: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:29:
+	volatile int __arena *page1, *page2, *no_page;
 	                     ^

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#122: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:29:
+	volatile int __arena *page1, *page2, *no_page;

WARNING: line length of 96 exceeds 80 columns
#142: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:49:
+	if (*page2 != 0 && *page2 != 2) /* use-after-free should return 0 or the stored value */

CHECK: spaces preferred around that '*' (ctx:WxV)
#160: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:99:
+	volatile char __arena *page1, *page2, *page3, *page4;
 	                      ^

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#160: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:99:
+	volatile char __arena *page1, *page2, *page3, *page4;

WARNING: Missing a blank line after declarations
#205: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:179:
+	struct bpf_arena___l *ar = (struct bpf_arena___l *)&arena;
+	volatile char __arena *pages;

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#205: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:179:
+	volatile char __arena *pages;

WARNING: line length of 92 exceeds 80 columns
#207: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:181:
+	pages = bpf_arena_alloc_pages(&ar->map, NULL, ar->map.max_entries, NUMA_NO_NODE, 0);

WARNING: line length of 81 exceeds 80 columns
#244: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:224:
+	/* Try to implicitly allocate the page (since there's only 2 of them). */

total: 0 errors, 8 warnings, 4 checks, 301 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 7cbb10224642 ("selftests: bpf: test non-sleepable arena allocations") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES 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, 8 warnings, 4 checks, 301 lines checked