Re: acl trouble after upgrading ubuntu

[safe/jmp/linux-2.6] / mm / kmemleak.c

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index c17dbc7..8bf765c 100644 (file)
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -123,6 +123,9 @@ struct kmemleak_scan_area {
        size_t length;
 };
 
+#define KMEMLEAK_GREY  0
+#define KMEMLEAK_BLACK -1
+
 /*
  * Structure holding the metadata for each allocated memory block.
  * Modifications to such objects should be made while holding the
@@ -310,17 +313,19 @@ static void hex_dump_object(struct seq_file *seq,
  */
 static bool color_white(const struct kmemleak_object *object)
 {
-       return object->count != -1 && object->count < object->min_count;
+       return object->count != KMEMLEAK_BLACK &&
+               object->count < object->min_count;
 }
 
 static bool color_gray(const struct kmemleak_object *object)
 {
-       return object->min_count != -1 && object->count >= object->min_count;
+       return object->min_count != KMEMLEAK_BLACK &&
+               object->count >= object->min_count;
 }
 
 static bool color_black(const struct kmemleak_object *object)
 {
-       return object->min_count == -1;
+       return object->min_count == KMEMLEAK_BLACK;
 }
 
 /*
@@ -550,6 +555,7 @@ static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
        object->tree_node.last = ptr + size - 1;
 
        write_lock_irqsave(&kmemleak_lock, flags);
+
        min_addr = min(min_addr, ptr);
        max_addr = max(max_addr, ptr + size);
        node = prio_tree_insert(&object_tree_root, &object->tree_node);
@@ -560,14 +566,12 @@ static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
         * random memory blocks.
         */
        if (node != &object->tree_node) {
-               unsigned long flags;
-
                kmemleak_stop("Cannot insert 0x%lx into the object search tree "
                              "(already existing)\n", ptr);
                object = lookup_object(ptr, 1);
-               spin_lock_irqsave(&object->lock, flags);
+               spin_lock(&object->lock);
                dump_object_info(object);
-               spin_unlock_irqrestore(&object->lock, flags);
+               spin_unlock(&object->lock);
 
                goto out;
        }
@@ -661,47 +665,55 @@ static void delete_object_part(unsigned long ptr, size_t size)
 
        put_object(object);
 }
-/*
- * Make a object permanently as gray-colored so that it can no longer be
- * reported as a leak. This is used in general to mark a false positive.
- */
-static void make_gray_object(unsigned long ptr)
+
+static void __paint_it(struct kmemleak_object *object, int color)
+{
+       object->min_count = color;
+       if (color == KMEMLEAK_BLACK)
+               object->flags |= OBJECT_NO_SCAN;
+}
+
+static void paint_it(struct kmemleak_object *object, int color)
 {
        unsigned long flags;
+
+       spin_lock_irqsave(&object->lock, flags);
+       __paint_it(object, color);
+       spin_unlock_irqrestore(&object->lock, flags);
+}
+
+static void paint_ptr(unsigned long ptr, int color)
+{
        struct kmemleak_object *object;
 
        object = find_and_get_object(ptr, 0);
        if (!object) {
-               kmemleak_warn("Graying unknown object at 0x%08lx\n", ptr);
+               kmemleak_warn("Trying to color unknown object "
+                             "at 0x%08lx as %s\n", ptr,
+                             (color == KMEMLEAK_GREY) ? "Grey" :
+                             (color == KMEMLEAK_BLACK) ? "Black" : "Unknown");
                return;
        }
-
-       spin_lock_irqsave(&object->lock, flags);
-       object->min_count = 0;
-       spin_unlock_irqrestore(&object->lock, flags);
+       paint_it(object, color);
        put_object(object);
 }
 
 /*
+ * Make a object permanently as gray-colored so that it can no longer be
+ * reported as a leak. This is used in general to mark a false positive.
+ */
+static void make_gray_object(unsigned long ptr)
+{
+       paint_ptr(ptr, KMEMLEAK_GREY);
+}
+
+/*
  * Mark the object as black-colored so that it is ignored from scans and
  * reporting.
  */
 static void make_black_object(unsigned long ptr)
 {
-       unsigned long flags;
-       struct kmemleak_object *object;
-
-       object = find_and_get_object(ptr, 0);
-       if (!object) {
-               kmemleak_warn("Blacking unknown object at 0x%08lx\n", ptr);
-               return;
-       }
-
-       spin_lock_irqsave(&object->lock, flags);
-       object->min_count = -1;
-       object->flags |= OBJECT_NO_SCAN;
-       spin_unlock_irqrestore(&object->lock, flags);
-       put_object(object);
+       paint_ptr(ptr, KMEMLEAK_BLACK);
 }
 
 /*
@@ -780,7 +792,8 @@ static void __init log_early(int op_type, const void *ptr, size_t size,
        struct early_log *log;
 
        if (crt_early_log >= ARRAY_SIZE(early_log)) {
-               pr_warning("Early log buffer exceeded\n");
+               pr_warning("Early log buffer exceeded, "
+                          "please increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE\n");
                kmemleak_disable();
                return;
        }
@@ -820,12 +833,15 @@ static void early_alloc(struct early_log *log)
         */
        rcu_read_lock();
        object = create_object((unsigned long)log->ptr, log->size,
-                              log->min_count, GFP_KERNEL);
+                              log->min_count, GFP_ATOMIC);
+       if (!object)
+               goto out;
        spin_lock_irqsave(&object->lock, flags);
        for (i = 0; i < log->trace_len; i++)
                object->trace[i] = log->trace[i];
        object->trace_len = log->trace_len;
        spin_unlock_irqrestore(&object->lock, flags);
+out:
        rcu_read_unlock();
 }
 
@@ -1275,7 +1291,7 @@ static int kmemleak_scan_thread(void *arg)
  * Start the automatic memory scanning thread. This function must be called
  * with the scan_mutex held.
  */
-void start_scan_thread(void)
+static void start_scan_thread(void)
 {
        if (scan_thread)
                return;
@@ -1290,7 +1306,7 @@ void start_scan_thread(void)
  * Stop the automatic memory scanning thread. This function must be called
  * with the scan_mutex held.
  */
-void stop_scan_thread(void)
+static void stop_scan_thread(void)
 {
        if (scan_thread) {
                kthread_stop(scan_thread);
@@ -1436,7 +1452,7 @@ static void kmemleak_clear(void)
                spin_lock_irqsave(&object->lock, flags);
                if ((object->flags & OBJECT_REPORTED) &&
                    unreferenced_object(object))
-                       object->min_count = 0;
+                       __paint_it(object, KMEMLEAK_GREY);
                spin_unlock_irqrestore(&object->lock, flags);
        }
        rcu_read_unlock();