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-rw-r--r--mm/kmemleak.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index f5042b4a7b9..c17dbc76fb7 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1421,6 +1421,28 @@ static int dump_str_object_info(const char *str)
}
/*
+ * We use grey instead of black to ensure we can do future scans on the same
+ * objects. If we did not do future scans these black objects could
+ * potentially contain references to newly allocated objects in the future and
+ * we'd end up with false positives.
+ */
+static void kmemleak_clear(void)
+{
+ struct kmemleak_object *object;
+ unsigned long flags;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(object, &object_list, object_list) {
+ spin_lock_irqsave(&object->lock, flags);
+ if ((object->flags & OBJECT_REPORTED) &&
+ unreferenced_object(object))
+ object->min_count = 0;
+ spin_unlock_irqrestore(&object->lock, flags);
+ }
+ rcu_read_unlock();
+}
+
+/*
* File write operation to configure kmemleak at run-time. The following
* commands can be written to the /sys/kernel/debug/kmemleak file:
* off - disable kmemleak (irreversible)
@@ -1431,6 +1453,8 @@ static int dump_str_object_info(const char *str)
* scan=... - set the automatic memory scanning period in seconds (0 to
* disable it)
* scan - trigger a memory scan
+ * clear - mark all current reported unreferenced kmemleak objects as
+ * grey to ignore printing them
* dump=... - dump information about the object found at the given address
*/
static ssize_t kmemleak_write(struct file *file, const char __user *user_buf,
@@ -1472,6 +1496,8 @@ static ssize_t kmemleak_write(struct file *file, const char __user *user_buf,
}
} else if (strncmp(buf, "scan", 4) == 0)
kmemleak_scan();
+ else if (strncmp(buf, "clear", 5) == 0)
+ kmemleak_clear();
else if (strncmp(buf, "dump=", 5) == 0)
ret = dump_str_object_info(buf + 5);
else