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-rw-r--r--mm/kmemleak.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 5d4aec44982e..3cda50c1e394 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -990,6 +990,40 @@ void __ref kmemleak_free_percpu(const void __percpu *ptr)
EXPORT_SYMBOL_GPL(kmemleak_free_percpu);
/**
+ * kmemleak_update_trace - update object allocation stack trace
+ * @ptr: pointer to beginning of the object
+ *
+ * Override the object allocation stack trace for cases where the actual
+ * allocation place is not always useful.
+ */
+void __ref kmemleak_update_trace(const void *ptr)
+{
+ struct kmemleak_object *object;
+ unsigned long flags;
+
+ pr_debug("%s(0x%p)\n", __func__, ptr);
+
+ if (!kmemleak_enabled || IS_ERR_OR_NULL(ptr))
+ return;
+
+ object = find_and_get_object((unsigned long)ptr, 1);
+ if (!object) {
+#ifdef DEBUG
+ kmemleak_warn("Updating stack trace for unknown object at %p\n",
+ ptr);
+#endif
+ return;
+ }
+
+ spin_lock_irqsave(&object->lock, flags);
+ object->trace_len = __save_stack_trace(object->trace);
+ spin_unlock_irqrestore(&object->lock, flags);
+
+ put_object(object);
+}
+EXPORT_SYMBOL(kmemleak_update_trace);
+
+/**
* kmemleak_not_leak - mark an allocated object as false positive
* @ptr: pointer to beginning of the object
*