WARNING: line length of 87 exceeds 80 columns
#24: FILE: tools/testing/selftests/bpf/bpf_arena_common.h:49:
+int bpf_arena_guard_pages(void *map, void __arena *addr, __u32 page_cnt) __ksym __weak;

WARNING: line length of 84 exceeds 80 columns
#27: FILE: tools/testing/selftests/bpf/bpf_arena_common.h:52:
+#define arena_base(map) ((void __arena *)((struct bpf_arena *)(map))->user_vm_start)

WARNING: line length of 81 exceeds 80 columns
#64: FILE: tools/testing/selftests/bpf/progs/verifier_arena.c:141:
+	/* Try to implicitly allocate the page (since there's only 2 of them). */

WARNING: line length of 98 exceeds 80 columns
#157: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:70:
+/* Try to access a guarded page. Behavior should be identical with accessing unallocated pages. */

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#163: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:76:
+	volatile char __arena *page;

CHECK: multiple assignments should be avoided
#169: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:82:
+	page = base = arena_base(&arena) + 16384 * PAGE_SIZE;

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#180: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:93:
+		page = (volatile char __arena *)(base + i * PAGE_SIZE);

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#202: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:115:
+	volatile char __arena *page;

CHECK: multiple assignments should be avoided
#207: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:120:
+	page = base = arena_base(&arena) + 4096 * __PAGE_SIZE;

WARNING: line length of 95 exceeds 80 columns
#242: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:155:
+	/* The free pages call above should have failed, so this allocation should fail too. */

WARNING: line length of 89 exceeds 80 columns
#243: FILE: tools/testing/selftests/bpf/progs/verifier_arena_large.c:156:
+	page = bpf_arena_alloc_pages(&arena, addr + 3 * __PAGE_SIZE, 1, NUMA_NO_NODE, 0);

total: 0 errors, 9 warnings, 2 checks, 222 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 2e773822d8bf ("selftests/bpf: add selftests for bpf_arena_guard_pages") 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, 9 warnings, 2 checks, 222 lines checked