CHECK: spaces preferred around that '<<' (ctx:VxW)
#61: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals1.c:12:
+#define ARENA_PAGES (1UL<< (32 - 12))
                         ^

WARNING: line length of 81 exceeds 80 columns
#69: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals1.c:20:
+	__ulong(map_extra, (1ull << 32) | (~0u - __PAGE_SIZE * ARENA_PAGES + 1));

WARNING: line length of 81 exceeds 80 columns
#71: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals1.c:22:
+	__ulong(map_extra, (1ull << 44) | (~0u - __PAGE_SIZE * ARENA_PAGES + 1));

CHECK: spaces preferred around that '*' (ctx:WxV)
#85: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals1.c:36:
+	__u8 __arena *guard, *globals;
 	             ^

WARNING: line length of 98 exceeds 80 columns
#89: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals1.c:40:
+	globals = (void __arena *)(arena_base(&arena) + (ARENA_PAGES - GLOBAL_PAGES) * PAGE_SIZE);

WARNING: line length of 81 exceeds 80 columns
#92: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals1.c:43:
+	ret = bpf_arena_reserve_pages(&arena, guard, ARENA_PAGES - GLOBAL_PAGES);

WARNING: Missing a blank line after declarations
#113: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals1.c:64:
+	const u8 magic = 0xfa;
+	u8 __arena *ptr;

WARNING: line length of 81 exceeds 80 columns
#149: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals2.c:19:
+	__ulong(map_extra, (1ull << 32) | (~0u - __PAGE_SIZE * ARENA_PAGES + 1));

WARNING: line length of 81 exceeds 80 columns
#151: FILE: tools/testing/selftests/bpf/progs/verifier_arena_globals2.c:21:
+	__ulong(map_extra, (1ull << 44) | (~0u - __PAGE_SIZE * ARENA_PAGES + 1));

total: 0 errors, 7 warnings, 2 checks, 140 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 08b28fc0a6ec ("selftests/bpf: add tests for the arena offset of globals") 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, 7 warnings, 2 checks, 140 lines checked