WARNING: line length of 82 exceeds 80 columns
#63: FILE: tools/testing/selftests/x86/test_shadow_stack.c:769:
+	const char *file = "/sys/bus/event_source/devices/uprobe/format/retprobe";

WARNING: line length of 86 exceeds 80 columns
#79: FILE: tools/testing/selftests/x86/test_shadow_stack.c:785:
+	while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &base) == 4) {

WARNING: line length of 89 exceeds 80 columns
#80: FILE: tools/testing/selftests/x86/test_shadow_stack.c:786:
+		if (buf[2] == 'x' && (uintptr_t)addr >= start && (uintptr_t)addr < end) {

WARNING: Prefer noinline over __attribute__((noinline))
#94: FILE: tools/testing/selftests/x86/test_shadow_stack.c:800:
+static __attribute__((noinline)) void uretprobe_trigger(void)

WARNING: line length of 86 exceeds 80 columns
#118: FILE: tools/testing/selftests/x86/test_shadow_stack.c:824:
+			printf("[SKIP]\tUretprobe test, uprobes are not available\n");

CHECK: No space is necessary after a cast
#140: FILE: tools/testing/selftests/x86/test_shadow_stack.c:846:
+	attr.config1 = (__u64) (unsigned long) file;

total: 0 errors, 5 warnings, 1 checks, 163 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 da1e3ac3de19 ("selftests/x86: Add return uprobe shadow stack test") 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, 5 warnings, 1 checks, 163 lines checked