8 files changed, 65 insertions, 14 deletions

diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
index 9089b0421191..7667db448aa7 100644
--- a/arch/powerpc/platforms/powermac/pic.c
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -715,7 +715,8 @@ static struct syscore_ops pmacpic_syscore_ops = {
 
 static int __init init_pmacpic_syscore(void)
 {
-        register_syscore_ops(&pmacpic_syscore_ops);
+        if (pmac_irq_hw[0])
+                register_syscore_ops(&pmacpic_syscore_ops);
         return 0;
 }
 
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index f5abe3a245b8..90b06d4daee2 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -8,6 +8,7 @@ CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE)
 
 ifdef CONFIG_FUNCTION_TRACER
 # Do not profile debug and lowlevel utilities
+CFLAGS_REMOVE_tsc.o = -pg
 CFLAGS_REMOVE_rtc.o = -pg
 CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
 CFLAGS_REMOVE_pvclock.o = -pg
@@ -28,6 +29,7 @@ CFLAGS_paravirt.o	:= $(nostackp)
 GCOV_PROFILE_vsyscall_64.o      := n
 GCOV_PROFILE_hpet.o             := n
 GCOV_PROFILE_tsc.o              := n
+GCOV_PROFILE_vread_tsc_64.o     := n
 GCOV_PROFILE_paravirt.o         := n
 
 # vread_tsc_64 is hot and should be fully optimized:
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 426a5b66f7e4..2e4928d45a2d 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -642,7 +642,7 @@ static int __init idle_setup(char *str)
                 boot_option_idle_override = IDLE_POLL;
         } else if (!strcmp(str, "mwait")) {
                 boot_option_idle_override = IDLE_FORCE_MWAIT;
-                WARN_ONCE(1, "\idle=mwait\" will be removed in 2012\"\n");
+                WARN_ONCE(1, "\"idle=mwait\" will be removed in 2012\n");
         } else if (!strcmp(str, "halt")) {
                 /*
                  * When the boot option of idle=halt is added, halt is
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index eefd96765e79..33a0c11797de 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1332,7 +1332,7 @@ static inline void mwait_play_dead(void)
         void *mwait_ptr;
         struct cpuinfo_x86 *c = __this_cpu_ptr(&cpu_info);
 
-        if (!this_cpu_has(X86_FEATURE_MWAIT) && mwait_usable(c))
+        if (!(this_cpu_has(X86_FEATURE_MWAIT) && mwait_usable(c)))
                 return;
         if (!this_cpu_has(X86_FEATURE_CLFLSH))
                 return;
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 87d95a8cddbc..f55ae23b137e 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -583,8 +583,6 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
         if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
                 return -EACCES;
 
-        dentry_unhash(dentry);
-
         if (atomic_dec_and_test(&ino->count)) {
                 p_ino = autofs4_dentry_ino(dentry->d_parent);
                 if (p_ino && dentry->d_parent != dentry)
diff --git a/fs/namei.c b/fs/namei.c
index 1ab641f2e78e..e2e4e8d032ee 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2579,6 +2579,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
         if (error)
                 goto out;
 
+        shrink_dcache_parent(dentry);
         error = dir->i_op->rmdir(dir, dentry);
         if (error)
                 goto out;
@@ -2993,6 +2994,8 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
         if (d_mountpoint(old_dentry) || d_mountpoint(new_dentry))
                 goto out;
 
+        if (target)
+                shrink_dcache_parent(new_dentry);
         error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
         if (error)
                 goto out;
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 77a7671dd147..89419ff92e99 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1648,7 +1648,6 @@ static int __cpuinit rcu_spawn_one_cpu_kthread(int cpu)
         if (IS_ERR(t))
                 return PTR_ERR(t);
         kthread_bind(t, cpu);
-        set_task_state(t, TASK_INTERRUPTIBLE);
         per_cpu(rcu_cpu_kthread_cpu, cpu) = cpu;
         WARN_ON_ONCE(per_cpu(rcu_cpu_kthread_task, cpu) != NULL);
         per_cpu(rcu_cpu_kthread_task, cpu) = t;
@@ -1756,7 +1755,6 @@ static int __cpuinit rcu_spawn_one_node_kthread(struct rcu_state *rsp,
                 if (IS_ERR(t))
                         return PTR_ERR(t);
                 raw_spin_lock_irqsave(&rnp->lock, flags);
-                set_task_state(t, TASK_INTERRUPTIBLE);
                 rnp->node_kthread_task = t;
                 raw_spin_unlock_irqrestore(&rnp->lock, flags);
                 sp.sched_priority = 99;
@@ -1765,6 +1763,8 @@ static int __cpuinit rcu_spawn_one_node_kthread(struct rcu_state *rsp,
         return rcu_spawn_one_boost_kthread(rsp, rnp, rnp_index);
 }
 
+static void rcu_wake_one_boost_kthread(struct rcu_node *rnp);
+
 /*
  * Spawn all kthreads -- called as soon as the scheduler is running.
  */
@@ -1772,18 +1772,30 @@ static int __init rcu_spawn_kthreads(void)
 {
         int cpu;
         struct rcu_node *rnp;
+        struct task_struct *t;
 
         rcu_kthreads_spawnable = 1;
         for_each_possible_cpu(cpu) {
                 per_cpu(rcu_cpu_has_work, cpu) = 0;
-                if (cpu_online(cpu))
+                if (cpu_online(cpu)) {
                         (void)rcu_spawn_one_cpu_kthread(cpu);
+                        t = per_cpu(rcu_cpu_kthread_task, cpu);
+                        if (t)
+                                wake_up_process(t);
+                }
         }
         rnp = rcu_get_root(rcu_state);
         (void)rcu_spawn_one_node_kthread(rcu_state, rnp);
+        if (rnp->node_kthread_task)
+                wake_up_process(rnp->node_kthread_task);
         if (NUM_RCU_NODES > 1) {
-                rcu_for_each_leaf_node(rcu_state, rnp)
+                rcu_for_each_leaf_node(rcu_state, rnp) {
                         (void)rcu_spawn_one_node_kthread(rcu_state, rnp);
+                        t = rnp->node_kthread_task;
+                        if (t)
+                                wake_up_process(t);
+                        rcu_wake_one_boost_kthread(rnp);
+                }
         }
         return 0;
 }
@@ -2188,14 +2200,14 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptible)
         raw_spin_unlock_irqrestore(&rsp->onofflock, flags);
 }
 
-static void __cpuinit rcu_online_cpu(int cpu)
+static void __cpuinit rcu_prepare_cpu(int cpu)
 {
         rcu_init_percpu_data(cpu, &rcu_sched_state, 0);
         rcu_init_percpu_data(cpu, &rcu_bh_state, 0);
         rcu_preempt_init_percpu_data(cpu);
 }
 
-static void __cpuinit rcu_online_kthreads(int cpu)
+static void __cpuinit rcu_prepare_kthreads(int cpu)
 {
         struct rcu_data *rdp = per_cpu_ptr(rcu_state->rda, cpu);
         struct rcu_node *rnp = rdp->mynode;
@@ -2209,6 +2221,31 @@ static void __cpuinit rcu_online_kthreads(int cpu)
 }
 
 /*
+ * kthread_create() creates threads in TASK_UNINTERRUPTIBLE state,
+ * but the RCU threads are woken on demand, and if demand is low this
+ * could be a while triggering the hung task watchdog.
+ *
+ * In order to avoid this, poke all tasks once the CPU is fully
+ * up and running.
+ */
+static void __cpuinit rcu_online_kthreads(int cpu)
+{
+        struct rcu_data *rdp = per_cpu_ptr(rcu_state->rda, cpu);
+        struct rcu_node *rnp = rdp->mynode;
+        struct task_struct *t;
+
+        t = per_cpu(rcu_cpu_kthread_task, cpu);
+        if (t)
+                wake_up_process(t);
+
+        t = rnp->node_kthread_task;
+        if (t)
+                wake_up_process(t);
+
+        rcu_wake_one_boost_kthread(rnp);
+}
+
+/*
  * Handle CPU online/offline notification events.
  */
 static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
@@ -2221,10 +2258,11 @@ static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
         switch (action) {
         case CPU_UP_PREPARE:
         case CPU_UP_PREPARE_FROZEN:
-                rcu_online_cpu(cpu);
-                rcu_online_kthreads(cpu);
+                rcu_prepare_cpu(cpu);
+                rcu_prepare_kthreads(cpu);
                 break;
         case CPU_ONLINE:
+                rcu_online_kthreads(cpu);
         case CPU_DOWN_FAILED:
                 rcu_node_kthread_setaffinity(rnp, -1);
                 rcu_cpu_kthread_setrt(cpu, 1);
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index a767b7dac365..c8bff3099a89 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -1295,7 +1295,6 @@ static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
         if (IS_ERR(t))
                 return PTR_ERR(t);
         raw_spin_lock_irqsave(&rnp->lock, flags);
-        set_task_state(t, TASK_INTERRUPTIBLE);
         rnp->boost_kthread_task = t;
         raw_spin_unlock_irqrestore(&rnp->lock, flags);
         sp.sched_priority = RCU_KTHREAD_PRIO;
@@ -1303,6 +1302,12 @@ static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
         return 0;
 }
 
+static void __cpuinit rcu_wake_one_boost_kthread(struct rcu_node *rnp)
+{
+        if (rnp->boost_kthread_task)
+                wake_up_process(rnp->boost_kthread_task);
+}
+
 #else /* #ifdef CONFIG_RCU_BOOST */
 
 static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
@@ -1326,6 +1331,10 @@ static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
         return 0;
 }
 
+static void __cpuinit rcu_wake_one_boost_kthread(struct rcu_node *rnp)
+{
+}
+
 #endif /* #else #ifdef CONFIG_RCU_BOOST */
 
 #ifndef CONFIG_SMP