[PATCH] fix/simplify mutex debugging code

Let's switch mutex_debug_check_no_locks_freed() to take (addr, len) as
arguments instead, since all its callers were just calculating the 'to'
address for themselves anyway... (and sometimes doing so badly).

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/kernel/mutex-debug.c b/kernel/mutex-debug.c
index 6f829058ae4a..f4913c376950 100644
--- a/kernel/mutex-debug.c
+++ b/kernel/mutex-debug.c
@@ -333,9 +333,10 @@ void mutex_debug_check_no_locks_held(struct task_struct *task)
  * is destroyed or reinitialized - this code checks whether there is
  * any held lock in the memory range of <from> to <to>:
  */
-void mutex_debug_check_no_locks_freed(const void *from, const void *to)
+void mutex_debug_check_no_locks_freed(const void *from, unsigned long len)
 {
         struct list_head *curr, *next;
+        const void *to = from + len;
         unsigned long flags;
         struct mutex *lock;
         void *lock_addr;
@@ -437,7 +438,7 @@ void debug_mutex_init(struct mutex *lock, const char *name)
         /*
          * Make sure we are not reinitializing a held lock:
          */
-        mutex_debug_check_no_locks_freed((void *)lock, (void *)(lock + 1));
+        mutex_debug_check_no_locks_freed((void *)lock, sizeof(*lock));
         lock->owner = NULL;
         INIT_LIST_HEAD(&lock->held_list);
         lock->name = name;