We always set 'key->private.mm' to 'current->mm', getting an extra
reference on 'current->mm' is quite pointless, because as long as the
task is blocked it isn't going to go away.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
static inline void compat_exit_robust_list(struct task_struct *curr) { }
#endif
-static inline void futex_get_mm(union futex_key *key)
-{
- mmgrab(key->private.mm);
- /*
- * Ensure futex_get_mm() implies a full barrier such that
- * get_futex_key() implies a full barrier. This is relied upon
- * as smp_mb(); (B), see the ordering comment above.
- */
- smp_mb__after_atomic();
-}
-
/*
* Reflects a new waiter being added to the waitqueue.
*/
smp_mb(); /* explicit smp_mb(); (B) */
break;
case FUT_OFF_MMSHARED:
- futex_get_mm(key); /* implies smp_mb(); (B) */
+ smp_mb(); /* explicit smp_mb(); (B) */
break;
default:
/*
case FUT_OFF_INODE:
break;
case FUT_OFF_MMSHARED:
- mmdrop(key->private.mm);
break;
}
}