diff --git a/drivers/gpu/drm/xe/xe_rtp.h b/drivers/gpu/drm/xe/xe_rtp.h
index 4e3cfd69f922..2cc65053cd07 100644
--- a/drivers/gpu/drm/xe/xe_rtp.h
+++ b/drivers/gpu/drm/xe/xe_rtp.h
@@ -461,14 +461,22 @@ struct xe_reg_sr;
 		XE_RTP_PASTE_FOREACH(ACTION_, COMMA, (__VA_ARGS__))	\
 	}
 
+/*
+ * Note: ARRAY_SIZE() cannot be used here because it expands through
+ * __must_be_array() -> __BUILD_BUG_ON_ZERO_MSG() -> _Static_assert inside
+ * sizeof(struct{}), which clang < 21 rejects when the compound literal
+ * contains non-compile-time-constant initializers.
+ */
 #define XE_RTP_TABLE_SR(...) { \
 	.entries = (const struct xe_rtp_entry_sr[]){__VA_ARGS__}, \
-	.n_entries = ARRAY_SIZE(((const struct xe_rtp_entry_sr[]){__VA_ARGS__})), \
+	.n_entries = sizeof((const struct xe_rtp_entry_sr[]){__VA_ARGS__}) / \
+		sizeof(struct xe_rtp_entry_sr), \
 }
 
 #define XE_RTP_TABLE(...) { \
 	.entries = (const struct xe_rtp_entry[]){__VA_ARGS__}, \
-	.n_entries = ARRAY_SIZE(((const struct xe_rtp_entry[]){__VA_ARGS__})), \
+	.n_entries = sizeof((const struct xe_rtp_entry[]){__VA_ARGS__}) / \
+		sizeof(struct xe_rtp_entry), \
 }
 
 #define XE_RTP_PROCESS_CTX_INITIALIZER(arg__) _Generic((arg__),							\