diff --git a/docs/misra/safe.json b/docs/misra/safe.json
index e3489dba8e..3584cb90c6 100644
--- a/docs/misra/safe.json
+++ b/docs/misra/safe.json
@@ -116,6 +116,14 @@
         },
         {
             "id": "SAF-14-safe",
+            "analyser": {
+                "eclair": "MC3A2.R10.1"
+            },
+            "name": "Rule 10.1: use boolean as an array index",
+            "text": "Using a boolean type as an array index is safe."
+        },
+        {
+            "id": "SAF-15-safe",
             "analyser": {},
             "name": "Sentinel",
             "text": "Next ID to be used"
diff --git a/xen/common/time.c b/xen/common/time.c
index 92f7b72464..c873b5731b 100644
--- a/xen/common/time.c
+++ b/xen/common/time.c
@@ -84,7 +84,8 @@ struct tm gmtime(unsigned long t)
     }
     tbuf.tm_year = y - 1900;
     tbuf.tm_yday = days;
-    ip = (const unsigned short int *)__mon_lengths[__isleap(y)];
+    /* SAF-14-safe use boolean as an array index */
+    ip = __mon_lengths[__isleap(y)];
     for ( y = 0; days >= ip[y]; ++y )
         days -= ip[y];
     tbuf.tm_mon = y;
diff --git a/xen/drivers/passthrough/arm/smmu-v3.c b/xen/drivers/passthrough/arm/smmu-v3.c
index 9478fcd11c..58f3331520 100644
--- a/xen/drivers/passthrough/arm/smmu-v3.c
+++ b/xen/drivers/passthrough/arm/smmu-v3.c
@@ -315,7 +315,7 @@ static int queue_poll_cons(struct arm_smmu_queue *q, bool sync, bool wfe)
 
 	while (queue_sync_cons_in(q),
 	      (sync ? !queue_empty(&q->llq) : queue_full(&q->llq))) {
-		if ((NOW() > timeout) > 0)
+		if (NOW() > timeout)
 			return -ETIMEDOUT;
 
 		if (wfe) {