aio: make the lookup_ioctx() lockless

[~andy/linux] / arch / s390 / mm / pgtable.c

diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index ef3635b52fc0ce1420945fdbd42cf32845ecf671..0767827540b1778b0d88fa555d957ca457dc1d41 100644 (file)
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -263,7 +263,7 @@ int s390_enable_sie(void)
        /* lets check if we are allowed to replace the mm */
        task_lock(tsk);
        if (!tsk->mm || atomic_read(&tsk->mm->mm_users) > 1 ||
-           tsk->mm != tsk->active_mm || tsk->mm->ioctx_list) {
+           tsk->mm != tsk->active_mm || !hlist_empty(&tsk->mm->ioctx_list)) {
                task_unlock(tsk);
                return -EINVAL;
        }
@@ -279,7 +279,7 @@ int s390_enable_sie(void)
        /* Now lets check again if something happened */
        task_lock(tsk);
        if (!tsk->mm || atomic_read(&tsk->mm->mm_users) > 1 ||
-           tsk->mm != tsk->active_mm || tsk->mm->ioctx_list) {
+           tsk->mm != tsk->active_mm || !hlist_empty(&tsk->mm->ioctx_list)) {
                mmput(mm);
                task_unlock(tsk);
                return -EINVAL;