Merge commit '3cf2f34' into sched/core, to fix build error

Fix this dependency on the locking tree's smp_mb*() API changes:

  kernel/sched/idle.c:247:3: error: implicit declaration of function ‘smp_mb__after_atomic’ [-Werror=implicit-function-declaration]

Signed-off-by: Ingo Molnar <mingo@kernel.org>

10 files changed, 74 insertions, 20 deletions

diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index 5b08a8540ecf..fef3a809e7cf 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -3,6 +3,42 @@
 #define _LINUX_ATOMIC_H
 #include <asm/atomic.h>
 
+/*
+ * Provide __deprecated wrappers for the new interface, avoid flag day changes.
+ * We need the ugly external functions to break header recursion hell.
+ */
+#ifndef smp_mb__before_atomic_inc
+static inline void __deprecated smp_mb__before_atomic_inc(void)
+{
+        extern void __smp_mb__before_atomic(void);
+        __smp_mb__before_atomic();
+}
+#endif
+
+#ifndef smp_mb__after_atomic_inc
+static inline void __deprecated smp_mb__after_atomic_inc(void)
+{
+        extern void __smp_mb__after_atomic(void);
+        __smp_mb__after_atomic();
+}
+#endif
+
+#ifndef smp_mb__before_atomic_dec
+static inline void __deprecated smp_mb__before_atomic_dec(void)
+{
+        extern void __smp_mb__before_atomic(void);
+        __smp_mb__before_atomic();
+}
+#endif
+
+#ifndef smp_mb__after_atomic_dec
+static inline void __deprecated smp_mb__after_atomic_dec(void)
+{
+        extern void __smp_mb__after_atomic(void);
+        __smp_mb__after_atomic();
+}
+#endif
+
 /**
  * atomic_add_unless - add unless the number is already a given value
  * @v: pointer of type atomic_t
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index be5fd38bd5a0..cbc5833fb221 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -32,6 +32,26 @@ extern unsigned long __sw_hweight64(__u64 w);
  */
 #include <asm/bitops.h>
 
+/*
+ * Provide __deprecated wrappers for the new interface, avoid flag day changes.
+ * We need the ugly external functions to break header recursion hell.
+ */
+#ifndef smp_mb__before_clear_bit
+static inline void __deprecated smp_mb__before_clear_bit(void)
+{
+        extern void __smp_mb__before_atomic(void);
+        __smp_mb__before_atomic();
+}
+#endif
+
+#ifndef smp_mb__after_clear_bit
+static inline void __deprecated smp_mb__after_clear_bit(void)
+{
+        extern void __smp_mb__after_atomic(void);
+        __smp_mb__after_atomic();
+}
+#endif
+
 #define for_each_set_bit(bit, addr, size) \
         for ((bit) = find_first_bit((addr), (size));            \
              (bit) < (size);                                    \
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index c40302f909ce..7cbf837a279c 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -278,7 +278,7 @@ static inline void get_bh(struct buffer_head *bh)
 
 static inline void put_bh(struct buffer_head *bh)
 {
-        smp_mb__before_atomic_dec();
+        smp_mb__before_atomic();
         atomic_dec(&bh->b_count);
 }
 
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 9f3c275e053e..ec274e0f4ed2 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -649,7 +649,7 @@ static inline void hd_ref_init(struct hd_struct *part)
 static inline void hd_struct_get(struct hd_struct *part)
 {
         atomic_inc(&part->ref);
-        smp_mb__after_atomic_inc();
+        smp_mb__after_atomic();
 }
 
 static inline int hd_struct_try_get(struct hd_struct *part)
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 051c85032f48..cb19f09d7e3e 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -491,7 +491,7 @@ static inline int tasklet_trylock(struct tasklet_struct *t)
 
 static inline void tasklet_unlock(struct tasklet_struct *t)
 {
-        smp_mb__before_clear_bit(); 
+        smp_mb__before_atomic();
         clear_bit(TASKLET_STATE_RUN, &(t)->state);
 }
 
@@ -539,7 +539,7 @@ static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
 {
         atomic_inc(&t->count);
-        smp_mb__after_atomic_inc();
+        smp_mb__after_atomic();
 }
 
 static inline void tasklet_disable(struct tasklet_struct *t)
@@ -551,13 +551,13 @@ static inline void tasklet_disable(struct tasklet_struct *t)
 
 static inline void tasklet_enable(struct tasklet_struct *t)
 {
-        smp_mb__before_atomic_dec();
+        smp_mb__before_atomic();
         atomic_dec(&t->count);
 }
 
 static inline void tasklet_hi_enable(struct tasklet_struct *t)
 {
-        smp_mb__before_atomic_dec();
+        smp_mb__before_atomic();
         atomic_dec(&t->count);
 }
 
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7ed3a3aa6604..616415a4fee4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -493,7 +493,7 @@ static inline void napi_disable(struct napi_struct *n)
 static inline void napi_enable(struct napi_struct *n)
 {
         BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
-        smp_mb__before_clear_bit();
+        smp_mb__before_atomic();
         clear_bit(NAPI_STATE_SCHED, &n->state);
 }
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ce93768a3312..b4f6bf982921 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2795,10 +2795,8 @@ static inline bool __must_check current_set_polling_and_test(void)
         /*
          * Polling state must be visible before we test NEED_RESCHED,
          * paired by resched_task()
-         *
-         * XXX: assumes set/clear bit are identical barrier wise.
          */
-        smp_mb__after_clear_bit();
+        smp_mb__after_atomic();
 
         return unlikely(tif_need_resched());
 }
@@ -2816,7 +2814,7 @@ static inline bool __must_check current_clr_polling_and_test(void)
          * Polling state must be visible before we test NEED_RESCHED,
          * paired by resched_task()
          */
-        smp_mb__after_clear_bit();
+        smp_mb__after_atomic();
 
         return unlikely(tif_need_resched());
 }
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 3a847de83fab..ad7dbe2cfecd 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -142,18 +142,18 @@ struct rpc_task_setup {
                                 test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
 #define rpc_clear_running(t)    \
         do { \
-                smp_mb__before_clear_bit(); \
+                smp_mb__before_atomic(); \
                 clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
-                smp_mb__after_clear_bit(); \
+                smp_mb__after_atomic(); \
         } while (0)
 
 #define RPC_IS_QUEUED(t)        test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
 #define rpc_set_queued(t)       set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
 #define rpc_clear_queued(t)     \
         do { \
-                smp_mb__before_clear_bit(); \
+                smp_mb__before_atomic(); \
                 clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
-                smp_mb__after_clear_bit(); \
+                smp_mb__after_atomic(); \
         } while (0)
 
 #define RPC_IS_ACTIVATED(t)     test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 3e5efb2b236e..3876f0f1dfd3 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -379,9 +379,9 @@ static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
 
 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
 {
-        smp_mb__before_clear_bit();
+        smp_mb__before_atomic();
         clear_bit(XPRT_CONNECTING, &xprt->state);
-        smp_mb__after_clear_bit();
+        smp_mb__after_atomic();
 }
 
 static inline int xprt_connecting(struct rpc_xprt *xprt)
@@ -411,9 +411,9 @@ static inline void xprt_clear_bound(struct rpc_xprt *xprt)
 
 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
 {
-        smp_mb__before_clear_bit();
+        smp_mb__before_atomic();
         clear_bit(XPRT_BINDING, &xprt->state);
-        smp_mb__after_clear_bit();
+        smp_mb__after_atomic();
 }
 
 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 1e98b5530425..6f8ab7da27c4 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -191,7 +191,7 @@ static inline void tracehook_notify_resume(struct pt_regs *regs)
          * pairs with task_work_add()->set_notify_resume() after
          * hlist_add_head(task->task_works);
          */
-        smp_mb__after_clear_bit();
+        smp_mb__after_atomic();
         if (unlikely(current->task_works))
                 task_work_run();
 }