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

Pull RCU updates from Ingo Molnar:
 "The biggest RCU changes in this cycle were:

   - Convert RCU's BUG_ON() and similar calls to WARN_ON() and similar.

   - Replace calls of RCU-bh and RCU-sched update-side functions to
     their vanilla RCU counterparts. This series is a step towards
     complete removal of the RCU-bh and RCU-sched update-side functions.

     ( Note that some of these conversions are going upstream via their
       respective maintainers. )

   - Documentation updates, including a number of flavor-consolidation
     updates from Joel Fernandes.

   - Miscellaneous fixes.

   - Automate generation of the initrd filesystem used for rcutorture
     testing.

   - Convert spin_is_locked() assertions to instead use lockdep.

     ( Note that some of these conversions are going upstream via their
       respective maintainers. )

   - SRCU updates, especially including a fix from Dennis Krein for a
     bag-on-head-class bug.

   - RCU torture-test updates"

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (112 commits)
  rcutorture: Don't do busted forward-progress testing
  rcutorture: Use 100ms buckets for forward-progress callback histograms
  rcutorture: Recover from OOM during forward-progress tests
  rcutorture: Print forward-progress test age upon failure
  rcutorture: Print time since GP end upon forward-progress failure
  rcutorture: Print histogram of CB invocation at OOM time
  rcutorture: Print GP age upon forward-progress failure
  rcu: Print per-CPU callback counts for forward-progress failures
  rcu: Account for nocb-CPU callback counts in RCU CPU stall warnings
  rcutorture: Dump grace-period diagnostics upon forward-progress OOM
  rcutorture: Prepare for asynchronous access to rcu_fwd_startat
  torture: Remove unnecessary "ret" variables
  rcutorture: Affinity forward-progress test to avoid housekeeping CPUs
  rcutorture: Break up too-long rcu_torture_fwd_prog() function
  rcutorture: Remove cbflood facility
  torture: Bring any extra CPUs online during kernel startup
  rcutorture: Add call_rcu() flooding forward-progress tests
  rcutorture/formal: Replace synchronize_sched() with synchronize_rcu()
  tools/kernel.h: Replace synchronize_sched() with synchronize_rcu()
  net/decnet: Replace rcu_barrier_bh() with rcu_barrier()
  ...

1 files changed, 12 insertions, 12 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index e23eb9fc77aa..f0ff24173a0b 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -173,7 +173,7 @@ static void ftrace_sync(struct work_struct *work)
 {
         /*
          * This function is just a stub to implement a hard force
-         * of synchronize_sched(). This requires synchronizing
+         * of synchronize_rcu(). This requires synchronizing
          * tasks even in userspace and idle.
          *
          * Yes, function tracing is rude.
@@ -934,7 +934,7 @@ ftrace_profile_write(struct file *filp, const char __user *ubuf,
                         ftrace_profile_enabled = 0;
                         /*
                          * unregister_ftrace_profiler calls stop_machine
-                         * so this acts like an synchronize_sched.
+                         * so this acts like an synchronize_rcu.
                          */
                         unregister_ftrace_profiler();
                 }
@@ -1086,7 +1086,7 @@ struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr)
 
         /*
          * Some of the ops may be dynamically allocated,
-         * they are freed after a synchronize_sched().
+         * they are freed after a synchronize_rcu().
          */
         preempt_disable_notrace();
 
@@ -1286,7 +1286,7 @@ static void free_ftrace_hash_rcu(struct ftrace_hash *hash)
 {
         if (!hash || hash == EMPTY_HASH)
                 return;
-        call_rcu_sched(&hash->rcu, __free_ftrace_hash_rcu);
+        call_rcu(&hash->rcu, __free_ftrace_hash_rcu);
 }
 
 void ftrace_free_filter(struct ftrace_ops *ops)
@@ -1501,7 +1501,7 @@ static bool hash_contains_ip(unsigned long ip,
  * the ip is not in the ops->notrace_hash.
  *
  * This needs to be called with preemption disabled as
- * the hashes are freed with call_rcu_sched().
+ * the hashes are freed with call_rcu().
  */
 static int
 ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
@@ -4496,7 +4496,7 @@ unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
         if (ftrace_enabled && !ftrace_hash_empty(hash))
                 ftrace_run_modify_code(&probe->ops, FTRACE_UPDATE_CALLS,
                                        &old_hash_ops);
-        synchronize_sched();
+        synchronize_rcu();
 
         hlist_for_each_entry_safe(entry, tmp, &hhd, hlist) {
                 hlist_del(&entry->hlist);
@@ -5314,7 +5314,7 @@ ftrace_graph_release(struct inode *inode, struct file *file)
                 mutex_unlock(&graph_lock);
 
                 /* Wait till all users are no longer using the old hash */
-                synchronize_sched();
+                synchronize_rcu();
 
                 free_ftrace_hash(old_hash);
         }
@@ -5708,7 +5708,7 @@ void ftrace_release_mod(struct module *mod)
         list_for_each_entry_safe(mod_map, n, &ftrace_mod_maps, list) {
                 if (mod_map->mod == mod) {
                         list_del_rcu(&mod_map->list);
-                        call_rcu_sched(&mod_map->rcu, ftrace_free_mod_map);
+                        call_rcu(&mod_map->rcu, ftrace_free_mod_map);
                         break;
                 }
         }
@@ -5928,7 +5928,7 @@ ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
         struct ftrace_mod_map *mod_map;
         const char *ret = NULL;
 
-        /* mod_map is freed via call_rcu_sched() */
+        /* mod_map is freed via call_rcu() */
         preempt_disable();
         list_for_each_entry_rcu(mod_map, &ftrace_mod_maps, list) {
                 ret = ftrace_func_address_lookup(mod_map, addr, size, off, sym);
@@ -6263,7 +6263,7 @@ __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
 
         /*
          * Some of the ops may be dynamically allocated,
-         * they must be freed after a synchronize_sched().
+         * they must be freed after a synchronize_rcu().
          */
         preempt_disable_notrace();
 
@@ -6434,7 +6434,7 @@ static void clear_ftrace_pids(struct trace_array *tr)
         rcu_assign_pointer(tr->function_pids, NULL);
 
         /* Wait till all users are no longer using pid filtering */
-        synchronize_sched();
+        synchronize_rcu();
 
         trace_free_pid_list(pid_list);
 }
@@ -6581,7 +6581,7 @@ ftrace_pid_write(struct file *filp, const char __user *ubuf,
         rcu_assign_pointer(tr->function_pids, pid_list);
 
         if (filtered_pids) {
-                synchronize_sched();
+                synchronize_rcu();
                 trace_free_pid_list(filtered_pids);
         } else if (pid_list) {
                 /* Register a probe to set whether to ignore the tracing of a task */