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-rw-r--r--kernel/freezer.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/freezer.c b/kernel/freezer.c
index 95a123844241..b1e7a7b3d2cd 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -171,3 +171,28 @@ void __thaw_task(struct task_struct *p)
}
spin_unlock_irqrestore(&freezer_lock, flags);
}
+
+/**
+ * __set_freezable - make %current freezable
+ * @with_signal: do we want %TIF_SIGPENDING for notification too?
+ *
+ * Mark %current freezable and enter refrigerator if necessary.
+ */
+bool __set_freezable(bool with_signal)
+{
+ might_sleep();
+
+ /*
+ * Modify flags while holding freezer_lock. This ensures the
+ * freezer notices that we aren't frozen yet or the freezing
+ * condition is visible to try_to_freeze() below.
+ */
+ spin_lock_irq(&freezer_lock);
+ current->flags &= ~PF_NOFREEZE;
+ if (with_signal)
+ current->flags &= ~PF_FREEZER_NOSIG;
+ spin_unlock_irq(&freezer_lock);
+
+ return try_to_freeze();
+}
+EXPORT_SYMBOL(__set_freezable);