kmemleak: move common painting code together
Luis R. Rodriguez [Sat, 5 Sep 2009 00:44:52 +0000 (17:44 -0700)]
When painting grey or black we do the same thing, bring
this together into a helper and identify coloring grey or
black explicitly with defines. This makes this a little
easier to read.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

mm/kmemleak.c

index c17dbc7..b18d9ca 100644 (file)
@@ -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;
 }
 
 /*
@@ -661,47 +666,55 @@ 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);
 }
 
 /*
@@ -1436,7 +1449,7 @@ 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();