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mm: kmemleak: factor object reference updating out of scan_block() 

scan_block() updates the number of references (pointers) to objects,
adding them to the gray_list when object->min_count is reached.  The
patch factors out this functionality into a separate update_refs()
function.

Link: http://lkml.kernel.org/r/1495726937-23557-3-git-send-email-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Catalin Marinas 2017-07-06 15:40:19 -07:00 committed by Linus Torvalds
parent f66abf09e0
commit 04f70d13ca
1 changed files with 25 additions and 18 deletions
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43
mm/kmemleak.c
View File

@ -1187,6 +1187,30 @@ static bool update_checksum(struct kmemleak_object *object)
return object->checksum != old_csum;
}
/*
* Update an object's references. object->lock must be held by the caller.
*/
static void update_refs(struct kmemleak_object *object)
{
if (!color_white(object)) {
/* non-orphan, ignored or new */
return;
}
/*
* Increase the object's reference count (number of pointers to the
* memory block). If this count reaches the required minimum, the
* object's color will become gray and it will be added to the
* gray_list.
*/
object->count++;
if (color_gray(object)) {
/* put_object() called when removing from gray_list */
WARN_ON(!get_object(object));
list_add_tail(&object->gray_list, &gray_list);
}
}
/*
* Memory scanning is a long process and it needs to be interruptable. This
* function checks whether such interrupt condition occurred.
@ -1259,24 +1283,7 @@ static void scan_block(void *_start, void *_end,
* enclosed by scan_mutex.
*/
spin_lock_nested(&object->lock, SINGLE_DEPTH_NESTING);
if (!color_white(object)) {
/* non-orphan, ignored or new */
spin_unlock(&object->lock);
continue;
}
/*
* Increase the object's reference count (number of pointers
* to the memory block). If this count reaches the required
* minimum, the object's color will become gray and it will be
* added to the gray_list.
*/
object->count++;
if (color_gray(object)) {
/* put_object() called when removing from gray_list */
WARN_ON(!get_object(object));
list_add_tail(&object->gray_list, &gray_list);
}
update_refs(object);
spin_unlock(&object->lock);
}
read_unlock_irqrestore(&kmemleak_lock, flags);