4 files changed, 43 insertions, 19 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 0c621604baa1..e3d00fdb858d 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -525,13 +525,21 @@ static inline struct cgroup_subsys_state *cgroup_subsys_state(
         return cgrp->subsys[subsys_id];
 }
 
-static inline struct cgroup_subsys_state *task_subsys_state(
-        struct task_struct *task, int subsys_id)
+/*
+ * function to get the cgroup_subsys_state which allows for extra
+ * rcu_dereference_check() conditions, such as locks used during the
+ * cgroup_subsys::attach() methods.
+ */
+#define task_subsys_state_check(task, subsys_id, __c)                   \
+        rcu_dereference_check(task->cgroups->subsys[subsys_id],         \
+                              rcu_read_lock_held() ||                   \
+                              lockdep_is_held(&task->alloc_lock) ||     \
+                              cgroup_lock_is_held() || (__c))
+
+static inline struct cgroup_subsys_state *
+task_subsys_state(struct task_struct *task, int subsys_id)
 {
-        return rcu_dereference_check(task->cgroups->subsys[subsys_id],
-                                     rcu_read_lock_held() ||
-                                     lockdep_is_held(&task->alloc_lock) ||
-                                     cgroup_lock_is_held());
+        return task_subsys_state_check(task, subsys_id, false);
 }
 
 static inline struct cgroup* task_cgroup(struct task_struct *task,
diff --git a/include/linux/list.h b/include/linux/list.h
index 8392884a2977..5d57a3a1fa1b 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -544,6 +544,21 @@ static inline void list_splice_tail_init(struct list_head *list,
              &pos->member != (head);                                    \
              pos = n, n = list_entry(n->member.prev, typeof(*n), member))
 
+/**
+ * list_safe_reset_next - reset a stale list_for_each_entry_safe loop
+ * @pos:        the loop cursor used in the list_for_each_entry_safe loop
+ * @n:          temporary storage used in list_for_each_entry_safe
+ * @member:     the name of the list_struct within the struct.
+ *
+ * list_safe_reset_next is not safe to use in general if the list may be
+ * modified concurrently (eg. the lock is dropped in the loop body). An
+ * exception to this is if the cursor element (pos) is pinned in the list,
+ * and list_safe_reset_next is called after re-taking the lock and before
+ * completing the current iteration of the loop body.
+ */
+#define list_safe_reset_next(pos, n, member)                            \
+        n = list_entry(pos->member.next, typeof(*pos), member)
+
 /*
  * Double linked lists with a single pointer list head.
  * Mostly useful for hash tables where the two pointer list head is
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 5e781d824e6d..bc7d6bb4cd8e 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -256,22 +256,22 @@ static inline int hibernate(void) { return -ENOSYS; }
 static inline bool system_entering_hibernation(void) { return false; }
 #endif /* CONFIG_HIBERNATION */
 
-#ifdef CONFIG_HIBERNATION_NVS
-extern int hibernate_nvs_register(unsigned long start, unsigned long size);
-extern int hibernate_nvs_alloc(void);
-extern void hibernate_nvs_free(void);
-extern void hibernate_nvs_save(void);
-extern void hibernate_nvs_restore(void);
-#else /* CONFIG_HIBERNATION_NVS */
-static inline int hibernate_nvs_register(unsigned long a, unsigned long b)
+#ifdef CONFIG_SUSPEND_NVS
+extern int suspend_nvs_register(unsigned long start, unsigned long size);
+extern int suspend_nvs_alloc(void);
+extern void suspend_nvs_free(void);
+extern void suspend_nvs_save(void);
+extern void suspend_nvs_restore(void);
+#else /* CONFIG_SUSPEND_NVS */
+static inline int suspend_nvs_register(unsigned long a, unsigned long b)
 {
         return 0;
 }
-static inline int hibernate_nvs_alloc(void) { return 0; }
-static inline void hibernate_nvs_free(void) {}
-static inline void hibernate_nvs_save(void) {}
-static inline void hibernate_nvs_restore(void) {}
-#endif /* CONFIG_HIBERNATION_NVS */
+static inline int suspend_nvs_alloc(void) { return 0; }
+static inline void suspend_nvs_free(void) {}
+static inline void suspend_nvs_save(void) {}
+static inline void suspend_nvs_restore(void) {}
+#endif /* CONFIG_SUSPEND_NVS */
 
 #ifdef CONFIG_PM_SLEEP
 void save_processor_state(void);
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 9a59d1f98cd4..103d1b61aacb 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -14,6 +14,7 @@
  * See the file COPYING for more details.
  */
 
+#include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/rcupdate.h>