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-rw-r--r--include/linux/mm_types.h13
1 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index eb7c16cc955..02a27ae7853 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -226,8 +226,17 @@ struct mm_struct {
rwlock_t ioctx_list_lock; /* aio lock */
struct kioctx *ioctx_list;
#ifdef CONFIG_MM_OWNER
- struct task_struct *owner; /* The thread group leader that */
- /* owns the mm_struct. */
+ /*
+ * "owner" points to a task that is regarded as the canonical
+ * user/owner of this mm. All of the following must be true in
+ * order for it to be changed:
+ *
+ * current == mm->owner
+ * current->mm != mm
+ * new_owner->mm == mm
+ * new_owner->alloc_lock is held
+ */
+ struct task_struct *owner;
#endif
#ifdef CONFIG_PROC_FS