Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

1 files changed, 90 insertions, 0 deletions

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
new file mode 100644
index 00000000000..5e75e26d478
--- /dev/null
+++ b/include/linux/freezer.h
@@ -0,0 +1,90 @@
+/* Freezer declarations */
+
+#include <linux/sched.h>
+
+#ifdef CONFIG_PM
+/*
+ * Check if a process has been frozen
+ */
+static inline int frozen(struct task_struct *p)
+{
+	return p->flags & PF_FROZEN;
+}
+
+/*
+ * Check if there is a request to freeze a process
+ */
+static inline int freezing(struct task_struct *p)
+{
+	return test_tsk_thread_flag(p, TIF_FREEZE);
+}
+
+/*
+ * Request that a process be frozen
+ */
+static inline void freeze(struct task_struct *p)
+{
+	set_tsk_thread_flag(p, TIF_FREEZE);
+}
+
+/*
+ * Sometimes we may need to cancel the previous 'freeze' request
+ */
+static inline void do_not_freeze(struct task_struct *p)
+{
+	clear_tsk_thread_flag(p, TIF_FREEZE);
+}
+
+/*
+ * Wake up a frozen process
+ */
+static inline int thaw_process(struct task_struct *p)
+{
+	if (frozen(p)) {
+		p->flags &= ~PF_FROZEN;
+		wake_up_process(p);
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * freezing is complete, mark process as frozen
+ */
+static inline void frozen_process(struct task_struct *p)
+{
+	p->flags |= PF_FROZEN;
+	wmb();
+	clear_tsk_thread_flag(p, TIF_FREEZE);
+}
+
+extern void refrigerator(void);
+extern int freeze_processes(void);
+extern void thaw_processes(void);
+
+static inline int try_to_freeze(void)
+{
+	if (freezing(current)) {
+		refrigerator();
+		return 1;
+	} else
+		return 0;
+}
+
+extern void thaw_some_processes(int all);
+
+#else
+static inline int frozen(struct task_struct *p) { return 0; }
+static inline int freezing(struct task_struct *p) { return 0; }
+static inline void freeze(struct task_struct *p) { BUG(); }
+static inline int thaw_process(struct task_struct *p) { return 1; }
+static inline void frozen_process(struct task_struct *p) { BUG(); }
+
+static inline void refrigerator(void) {}
+static inline int freeze_processes(void) { BUG(); return 0; }
+static inline void thaw_processes(void) {}
+
+static inline int try_to_freeze(void) { return 0; }
+
+
+#endif