diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/kmemleak.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c index f5042b4a7b95..c17dbc76fb72 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 |