diff options
| -rw-r--r-- | include/linux/futex.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/futex.h b/include/linux/futex.h index eccc99751bd9..168ffd5996b4 100644 --- a/include/linux/futex.h +++ b/include/linux/futex.h @@ -88,7 +88,14 @@ void futex_hash_free(struct mm_struct *mm); static inline void futex_mm_init(struct mm_struct *mm) { - rcu_assign_pointer(mm->futex_phash, NULL); + /* + * No need for rcu_assign_pointer() here, as we can rely on + * tasklist_lock write-ordering in copy_process(), before + * the task's MM becomes visible and the ->futex_phash + * becomes externally observable: + */ + mm->futex_phash = NULL; + mutex_init(&mm->futex_hash_lock); } |