add hrtimer specific debugobjects code

hrtimers have now dynamic users in the network code.  Put them under
debugobjects surveillance as well.

Add calls to the generic object debugging infrastructure and provide fixup
functions which allow to keep the system alive when recoverable problems have
been detected by the object debugging core code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 3 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index e43945e995f5..98092c9817f4 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1266,11 +1266,13 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
                 if (!abs_time)
                         schedule();
                 else {
-                        hrtimer_init(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+                        hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC,
+                                                HRTIMER_MODE_ABS);
                         hrtimer_init_sleeper(&t, current);
                         t.timer.expires = *abs_time;
 
-                        hrtimer_start(&t.timer, t.timer.expires, HRTIMER_MODE_ABS);
+                        hrtimer_start(&t.timer, t.timer.expires,
+                                                HRTIMER_MODE_ABS);
                         if (!hrtimer_active(&t.timer))
                                 t.task = NULL;
 
@@ -1286,6 +1288,8 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 
                         /* Flag if a timeout occured */
                         rem = (t.task == NULL);
+
+                        destroy_hrtimer_on_stack(&t.timer);
                 }
         }
         __set_current_state(TASK_RUNNING);
@@ -1367,7 +1371,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 
         if (time) {
                 to = &timeout;
-                hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
+                hrtimer_init_on_stack(&to->timer, CLOCK_REALTIME,
+                                      HRTIMER_MODE_ABS);
                 hrtimer_init_sleeper(to, current);
                 to->timer.expires = *time;
         }
@@ -1581,6 +1586,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
         unqueue_me_pi(&q);
         futex_unlock_mm(fshared);
 
+        if (to)
+                destroy_hrtimer_on_stack(&to->timer);
         return ret != -EINTR ? ret : -ERESTARTNOINTR;
 
  out_unlock_release_sem:
@@ -1588,6 +1595,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 
  out_release_sem:
         futex_unlock_mm(fshared);
+        if (to)
+                destroy_hrtimer_on_stack(&to->timer);
         return ret;
 
  uaddr_faulted:
@@ -1615,6 +1624,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
         if (!ret && (uval != -EFAULT))
                 goto retry;
 
+        if (to)
+                destroy_hrtimer_on_stack(&to->timer);
         return ret;
 }