arm64: configs: rockchip_defconfig: enable rk3368 thermal

[firefly-linux-kernel-4.4.55.git] / ipc / util.h

diff --git a/ipc/util.h b/ipc/util.h
index 2b0bdd5d92ce51415ae3243766f0acac1caffd33..3a8a5a0eca6252f04cf188fa6921291f9ec6fc31 100644 (file)
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -15,9 +15,9 @@
 
 #define SEQ_MULTIPLIER (IPCMNI)
 
-void sem_init (void);
-void msg_init (void);
-void shm_init (void);
+void sem_init(void);
+void msg_init(void);
+void shm_init(void);
 
 struct ipc_namespace;
 
@@ -47,6 +47,13 @@ static inline void msg_exit_ns(struct ipc_namespace *ns) { }
 static inline void shm_exit_ns(struct ipc_namespace *ns) { }
 #endif
 
+struct ipc_rcu {
+       struct rcu_head rcu;
+       atomic_t refcount;
+} ____cacheline_aligned_in_smp;
+
+#define ipc_rcu_to_struct(p)  ((void *)(p+1))
+
 /*
  * Structure that holds the parameters needed by the ipc operations
  * (see after)
@@ -71,9 +78,9 @@ struct ipc_params {
  *      . routine to call for an extra check if needed
  */
 struct ipc_ops {
-       int (*getnew) (struct ipc_namespace *, struct ipc_params *);
-       int (*associate) (struct kern_ipc_perm *, int);
-       int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *);
+       int (*getnew)(struct ipc_namespace *, struct ipc_params *);
+       int (*associate)(struct kern_ipc_perm *, int);
+       int (*more_checks)(struct kern_ipc_perm *, struct ipc_params *);
 };
 
 struct seq_file;
@@ -93,11 +100,12 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
 
 #define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER)
 #define ipcid_to_seqx(id) ((id) / SEQ_MULTIPLIER)
+#define IPCID_SEQ_MAX min_t(int, INT_MAX/SEQ_MULTIPLIER, USHRT_MAX)
 
-/* must be called with ids->rw_mutex acquired for writing */
+/* must be called with ids->rwsem acquired for writing */
 int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
 
-/* must be called with ids->rw_mutex acquired for reading */
+/* must be called with ids->rwsem acquired for reading */
 int ipc_get_maxid(struct ipc_ids *);
 
 /* must be called with both locks acquired. */
@@ -109,8 +117,8 @@ int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg);
 /* for rare, potentially huge allocations.
  * both function can sleep
  */
-void* ipc_alloc(int size);
-void ipc_free(void* ptr, int size);
+void *ipc_alloc(int size);
+void ipc_free(void *ptr, int size);
 
 /*
  * For allocation that need to be freed by RCU.
@@ -118,12 +126,13 @@ void ipc_free(void* ptr, int size);
  * getref increases the refcount, the putref call that reduces the recount
  * to 0 schedules the rcu destruction. Caller must guarantee locking.
  */
-void* ipc_rcu_alloc(int size);
+void *ipc_rcu_alloc(int size);
 int ipc_rcu_getref(void *ptr);
-void ipc_rcu_putref(void *ptr);
+void ipc_rcu_putref(void *ptr, void (*func)(struct rcu_head *head));
+void ipc_rcu_free(struct rcu_head *head);
 
 struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int);
-struct kern_ipc_perm *ipc_obtain_object(struct ipc_ids *ids, int id);
+struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id);
 
 void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
 void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
@@ -131,21 +140,18 @@ int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
 struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns,
                                             struct ipc_ids *ids, int id, int cmd,
                                             struct ipc64_perm *perm, int extra_perm);
-struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns,
-                                     struct ipc_ids *ids, int id, int cmd,
-                                     struct ipc64_perm *perm, int extra_perm);
 
 #ifndef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
-  /* On IA-64, we always use the "64-bit version" of the IPC structures.  */ 
+/* On IA-64, we always use the "64-bit version" of the IPC structures.  */
 # define ipc_parse_version(cmd)        IPC_64
 #else
-int ipc_parse_version (int *cmd);
+int ipc_parse_version(int *cmd);
 #endif
 
 extern void free_msg(struct msg_msg *msg);
-extern struct msg_msg *load_msg(const void __user *src, int len);
+extern struct msg_msg *load_msg(const void __user *src, size_t len);
 extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst);
-extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
+extern int store_msg(void __user *dest, struct msg_msg *msg, size_t len);
 
 extern void recompute_msgmni(struct ipc_namespace *);
 
@@ -159,27 +165,43 @@ static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid)
        return uid / SEQ_MULTIPLIER != ipcp->seq;
 }
 
-static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
+static inline void ipc_lock_object(struct kern_ipc_perm *perm)
 {
-       rcu_read_lock();
        spin_lock(&perm->lock);
 }
 
-static inline void ipc_unlock(struct kern_ipc_perm *perm)
+static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
 {
        spin_unlock(&perm->lock);
+}
+
+static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)
+{
+       assert_spin_locked(&perm->lock);
+}
+
+static inline void ipc_unlock(struct kern_ipc_perm *perm)
+{
+       ipc_unlock_object(perm);
        rcu_read_unlock();
 }
 
-static inline void ipc_lock_object(struct kern_ipc_perm *perm)
+/*
+ * ipc_valid_object() - helper to sort out IPC_RMID races for codepaths
+ * where the respective ipc_ids.rwsem is not being held down.
+ * Checks whether the ipc object is still around or if it's gone already, as
+ * ipc_rmid() may have already freed the ID while the ipc lock was spinning.
+ * Needs to be called with kern_ipc_perm.lock held -- exception made for one
+ * checkpoint case at sys_semtimedop() as noted in code commentary.
+ */
+static inline bool ipc_valid_object(struct kern_ipc_perm *perm)
 {
-       spin_lock(&perm->lock);
+       return !perm->deleted;
 }
 
-struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id);
 struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
 int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
-                       struct ipc_ops *ops, struct ipc_params *params);
+                       const struct ipc_ops *ops, struct ipc_params *params);
 void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
                void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));
 #endif