Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (45 commits)
  rcu: Move propagation of ->completed from rcu_start_gp() to rcu_report_qs_rsp()
  rcu: Remove rcu_needs_cpu_flush() to avoid false quiescent states
  rcu: Wire up RCU_BOOST_PRIO for rcutree
  rcu: Make rcu_torture_boost() exit loops at end of test
  rcu: Make rcu_torture_fqs() exit loops at end of test
  rcu: Permit rt_mutex_unlock() with irqs disabled
  rcu: Avoid having just-onlined CPU resched itself when RCU is idle
  rcu: Suppress NMI backtraces when stall ends before dump
  rcu: Prohibit grace periods during early boot
  rcu: Simplify unboosting checks
  rcu: Prevent early boot set_need_resched() from __rcu_pending()
  rcu: Dump local stack if cannot dump all CPUs' stacks
  rcu: Move __rcu_read_unlock()'s barrier() within if-statement
  rcu: Improve rcu_assign_pointer() and RCU_INIT_POINTER() documentation
  rcu: Make rcu_assign_pointer() unconditionally insert a memory barrier
  rcu: Make rcu_implicit_dynticks_qs() locals be correct size
  rcu: Eliminate in_irq() checks in rcu_enter_nohz()
  nohz: Remove nohz_cpu_mask
  rcu: Document interpretation of RCU-lockdep splats
  rcu: Allow rcutorture's stat_interval parameter to be changed at runtime
  ...

1 files changed, 47 insertions, 37 deletions

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index c081fa967c8f..e69434b070da 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -1145,10 +1145,11 @@ print_circular_bug_header(struct lock_list *entry, unsigned int depth,
         if (debug_locks_silent)
                 return 0;
 
-        printk("\n=======================================================\n");
-        printk(  "[ INFO: possible circular locking dependency detected ]\n");
+        printk("\n");
+        printk("======================================================\n");
+        printk("[ INFO: possible circular locking dependency detected ]\n");
         print_kernel_version();
-        printk(  "-------------------------------------------------------\n");
+        printk("-------------------------------------------------------\n");
         printk("%s/%d is trying to acquire lock:\n",
                 curr->comm, task_pid_nr(curr));
         print_lock(check_src);
@@ -1482,11 +1483,12 @@ print_bad_irq_dependency(struct task_struct *curr,
         if (!debug_locks_off_graph_unlock() || debug_locks_silent)
                 return 0;
 
-        printk("\n======================================================\n");
-        printk(  "[ INFO: %s-safe -> %s-unsafe lock order detected ]\n",
+        printk("\n");
+        printk("======================================================\n");
+        printk("[ INFO: %s-safe -> %s-unsafe lock order detected ]\n",
                 irqclass, irqclass);
         print_kernel_version();
-        printk(  "------------------------------------------------------\n");
+        printk("------------------------------------------------------\n");
         printk("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n",
                 curr->comm, task_pid_nr(curr),
                 curr->hardirq_context, hardirq_count() >> HARDIRQ_SHIFT,
@@ -1711,10 +1713,11 @@ print_deadlock_bug(struct task_struct *curr, struct held_lock *prev,
         if (!debug_locks_off_graph_unlock() || debug_locks_silent)
                 return 0;
 
-        printk("\n=============================================\n");
-        printk(  "[ INFO: possible recursive locking detected ]\n");
+        printk("\n");
+        printk("=============================================\n");
+        printk("[ INFO: possible recursive locking detected ]\n");
         print_kernel_version();
-        printk(  "---------------------------------------------\n");
+        printk("---------------------------------------------\n");
         printk("%s/%d is trying to acquire lock:\n",
                 curr->comm, task_pid_nr(curr));
         print_lock(next);
@@ -2217,10 +2220,11 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this,
         if (!debug_locks_off_graph_unlock() || debug_locks_silent)
                 return 0;
 
-        printk("\n=================================\n");
-        printk(  "[ INFO: inconsistent lock state ]\n");
+        printk("\n");
+        printk("=================================\n");
+        printk("[ INFO: inconsistent lock state ]\n");
         print_kernel_version();
-        printk(  "---------------------------------\n");
+        printk("---------------------------------\n");
 
         printk("inconsistent {%s} -> {%s} usage.\n",
                 usage_str[prev_bit], usage_str[new_bit]);
@@ -2281,10 +2285,11 @@ print_irq_inversion_bug(struct task_struct *curr,
         if (!debug_locks_off_graph_unlock() || debug_locks_silent)
                 return 0;
 
-        printk("\n=========================================================\n");
-        printk(  "[ INFO: possible irq lock inversion dependency detected ]\n");
+        printk("\n");
+        printk("=========================================================\n");
+        printk("[ INFO: possible irq lock inversion dependency detected ]\n");
         print_kernel_version();
-        printk(  "---------------------------------------------------------\n");
+        printk("---------------------------------------------------------\n");
         printk("%s/%d just changed the state of lock:\n",
                 curr->comm, task_pid_nr(curr));
         print_lock(this);
@@ -3161,9 +3166,10 @@ print_unlock_inbalance_bug(struct task_struct *curr, struct lockdep_map *lock,
         if (debug_locks_silent)
                 return 0;
 
-        printk("\n=====================================\n");
-        printk(  "[ BUG: bad unlock balance detected! ]\n");
-        printk(  "-------------------------------------\n");
+        printk("\n");
+        printk("=====================================\n");
+        printk("[ BUG: bad unlock balance detected! ]\n");
+        printk("-------------------------------------\n");
         printk("%s/%d is trying to release lock (",
                 curr->comm, task_pid_nr(curr));
         print_lockdep_cache(lock);
@@ -3604,9 +3610,10 @@ print_lock_contention_bug(struct task_struct *curr, struct lockdep_map *lock,
         if (debug_locks_silent)
                 return 0;
 
-        printk("\n=================================\n");
-        printk(  "[ BUG: bad contention detected! ]\n");
-        printk(  "---------------------------------\n");
+        printk("\n");
+        printk("=================================\n");
+        printk("[ BUG: bad contention detected! ]\n");
+        printk("---------------------------------\n");
         printk("%s/%d is trying to contend lock (",
                 curr->comm, task_pid_nr(curr));
         print_lockdep_cache(lock);
@@ -3977,9 +3984,10 @@ print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
         if (debug_locks_silent)
                 return;
 
-        printk("\n=========================\n");
-        printk(  "[ BUG: held lock freed! ]\n");
-        printk(  "-------------------------\n");
+        printk("\n");
+        printk("=========================\n");
+        printk("[ BUG: held lock freed! ]\n");
+        printk("-------------------------\n");
         printk("%s/%d is freeing memory %p-%p, with a lock still held there!\n",
                 curr->comm, task_pid_nr(curr), mem_from, mem_to-1);
         print_lock(hlock);
@@ -4033,9 +4041,10 @@ static void print_held_locks_bug(struct task_struct *curr)
         if (debug_locks_silent)
                 return;
 
-        printk("\n=====================================\n");
-        printk(  "[ BUG: lock held at task exit time! ]\n");
-        printk(  "-------------------------------------\n");
+        printk("\n");
+        printk("=====================================\n");
+        printk("[ BUG: lock held at task exit time! ]\n");
+        printk("-------------------------------------\n");
         printk("%s/%d is exiting with locks still held!\n",
                 curr->comm, task_pid_nr(curr));
         lockdep_print_held_locks(curr);
@@ -4129,16 +4138,17 @@ void lockdep_sys_exit(void)
         if (unlikely(curr->lockdep_depth)) {
                 if (!debug_locks_off())
                         return;
-                printk("\n================================================\n");
-                printk(  "[ BUG: lock held when returning to user space! ]\n");
-                printk(  "------------------------------------------------\n");
+                printk("\n");
+                printk("================================================\n");
+                printk("[ BUG: lock held when returning to user space! ]\n");
+                printk("------------------------------------------------\n");
                 printk("%s/%d is leaving the kernel with locks still held!\n",
                                 curr->comm, curr->pid);
                 lockdep_print_held_locks(curr);
         }
 }
 
-void lockdep_rcu_dereference(const char *file, const int line)
+void lockdep_rcu_suspicious(const char *file, const int line, const char *s)
 {
         struct task_struct *curr = current;
 
@@ -4147,15 +4157,15 @@ void lockdep_rcu_dereference(const char *file, const int line)
                 return;
 #endif /* #ifdef CONFIG_PROVE_RCU_REPEATEDLY */
         /* Note: the following can be executed concurrently, so be careful. */
-        printk("\n===================================================\n");
-        printk(  "[ INFO: suspicious rcu_dereference_check() usage. ]\n");
-        printk(  "---------------------------------------------------\n");
-        printk("%s:%d invoked rcu_dereference_check() without protection!\n",
-                        file, line);
+        printk("\n");
+        printk("===============================\n");
+        printk("[ INFO: suspicious RCU usage. ]\n");
+        printk("-------------------------------\n");
+        printk("%s:%d %s!\n", file, line, s);
         printk("\nother info that might help us debug this:\n\n");
         printk("\nrcu_scheduler_active = %d, debug_locks = %d\n", rcu_scheduler_active, debug_locks);
         lockdep_print_held_locks(curr);
         printk("\nstack backtrace:\n");
         dump_stack();
 }
-EXPORT_SYMBOL_GPL(lockdep_rcu_dereference);
+EXPORT_SYMBOL_GPL(lockdep_rcu_suspicious);