[PATCH v2 1/6] cxl/test: Add test for module parameters

[Dave Jiang <dave.jiang@intel.com>]

Add a test for module paraters during module init to make sure that
only one is activated.

Suggested-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 tools/testing/cxl/test/cxl.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index 48cae9dde2e4..e60cd0b2ac7b 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -1867,11 +1867,29 @@ static struct attribute *cxl_acpi_attrs[] = {
 };
 ATTRIBUTE_GROUPS(cxl_acpi);
 
+bool __init have_multiple_modparms(void)
+{
+	int count = 0;
+
+	if (interleave_arithmetic)
+		count++;
+	if (extended_linear_cache)
+		count++;
+	if (fail_autoassemble)
+		count++;
+
+	return count > 1;
+}
+
 static __init int cxl_test_init(void)
 {
 	int rc, i;
 	struct range mappable;
 
+	/* Enforce a single module param active at a time */
+	if (have_multiple_modparms())
+		return -EINVAL;
+
 	cxl_acpi_test();
 	cxl_core_test();
 	cxl_mem_test();
-- 
2.54.0