26 files changed, 227 insertions, 136 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index e0f2831634b4..5669f71dfdd5 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -122,7 +122,7 @@ $(obj)/configs.o: $(obj)/config_data.h
 # config_data.h contains the same information as ikconfig.h but gzipped.
 # Info from config_data can be extracted from /proc/config*
 targets += config_data.gz
-$(obj)/config_data.gz: .config FORCE
+$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
 	$(call if_changed,gzip)
 
 quiet_cmd_ikconfiggz = IKCFG   $@
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 66a416b42c18..51cddc11cd85 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -763,6 +763,8 @@ EXPORT_SYMBOL_GPL(cgroup_unlock);
  * -> cgroup_mkdir.
  */
 
+static struct dentry *cgroup_lookup(struct inode *dir,
+			struct dentry *dentry, struct nameidata *nd);
 static int cgroup_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry);
 static int cgroup_populate_dir(struct cgroup *cgrp);
@@ -874,25 +876,29 @@ static void cgroup_clear_directory(struct dentry *dentry)
 	struct list_head *node;
 
 	BUG_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
-	spin_lock(&dcache_lock);
+	spin_lock(&dentry->d_lock);
 	node = dentry->d_subdirs.next;
 	while (node != &dentry->d_subdirs) {
 		struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
+
+		spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
 		list_del_init(node);
 		if (d->d_inode) {
 			/* This should never be called on a cgroup
 			 * directory with child cgroups */
 			BUG_ON(d->d_inode->i_mode & S_IFDIR);
-			d = dget_locked(d);
-			spin_unlock(&dcache_lock);
+			dget_dlock(d);
+			spin_unlock(&d->d_lock);
+			spin_unlock(&dentry->d_lock);
 			d_delete(d);
 			simple_unlink(dentry->d_inode, d);
 			dput(d);
-			spin_lock(&dcache_lock);
-		}
+			spin_lock(&dentry->d_lock);
+		} else
+			spin_unlock(&d->d_lock);
 		node = dentry->d_subdirs.next;
 	}
-	spin_unlock(&dcache_lock);
+	spin_unlock(&dentry->d_lock);
 }
 
 /*
@@ -900,11 +906,16 @@ static void cgroup_clear_directory(struct dentry *dentry)
  */
 static void cgroup_d_remove_dir(struct dentry *dentry)
 {
+	struct dentry *parent;
+
 	cgroup_clear_directory(dentry);
 
-	spin_lock(&dcache_lock);
+	parent = dentry->d_parent;
+	spin_lock(&parent->d_lock);
+	spin_lock(&dentry->d_lock);
 	list_del_init(&dentry->d_u.d_child);
-	spin_unlock(&dcache_lock);
+	spin_unlock(&dentry->d_lock);
+	spin_unlock(&parent->d_lock);
 	remove_dir(dentry);
 }
 
@@ -2180,7 +2191,7 @@ static const struct file_operations cgroup_file_operations = {
 };
 
 static const struct inode_operations cgroup_dir_inode_operations = {
-	.lookup = simple_lookup,
+	.lookup = cgroup_lookup,
 	.mkdir = cgroup_mkdir,
 	.rmdir = cgroup_rmdir,
 	.rename = cgroup_rename,
@@ -2196,13 +2207,29 @@ static inline struct cftype *__file_cft(struct file *file)
 	return __d_cft(file->f_dentry);
 }
 
-static int cgroup_create_file(struct dentry *dentry, mode_t mode,
-				struct super_block *sb)
+static int cgroup_delete_dentry(const struct dentry *dentry)
+{
+	return 1;
+}
+
+static struct dentry *cgroup_lookup(struct inode *dir,
+			struct dentry *dentry, struct nameidata *nd)
 {
-	static const struct dentry_operations cgroup_dops = {
+	static const struct dentry_operations cgroup_dentry_operations = {
+		.d_delete = cgroup_delete_dentry,
 		.d_iput = cgroup_diput,
 	};
 
+	if (dentry->d_name.len > NAME_MAX)
+		return ERR_PTR(-ENAMETOOLONG);
+	d_set_d_op(dentry, &cgroup_dentry_operations);
+	d_add(dentry, NULL);
+	return NULL;
+}
+
+static int cgroup_create_file(struct dentry *dentry, mode_t mode,
+				struct super_block *sb)
+{
 	struct inode *inode;
 
 	if (!dentry)
@@ -2228,7 +2255,6 @@ static int cgroup_create_file(struct dentry *dentry, mode_t mode,
 		inode->i_size = 0;
 		inode->i_fop = &cgroup_file_operations;
 	}
-	dentry->d_op = &cgroup_dops;
 	d_instantiate(dentry, inode);
 	dget(dentry);	/* Extra count - pin the dentry in core */
 	return 0;
@@ -3638,9 +3664,7 @@ again:
 	list_del(&cgrp->sibling);
 	cgroup_unlock_hierarchy(cgrp->root);
 
-	spin_lock(&cgrp->dentry->d_lock);
 	d = dget(cgrp->dentry);
-	spin_unlock(&d->d_lock);
 
 	cgroup_d_remove_dir(d);
 	dput(d);
diff --git a/kernel/exit.c b/kernel/exit.c
index 8cb89045ecf3..f9a45ebcc7b1 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -69,7 +69,7 @@ static void __unhash_process(struct task_struct *p, bool group_dead)
 
 		list_del_rcu(&p->tasks);
 		list_del_init(&p->sibling);
-		__get_cpu_var(process_counts)--;
+		__this_cpu_dec(process_counts);
 	}
 	list_del_rcu(&p->thread_group);
 }
diff --git a/kernel/fork.c b/kernel/fork.c
index 7d164e25b0f0..d9b44f20b6b0 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -169,15 +169,14 @@ EXPORT_SYMBOL(free_task);
 static inline void free_signal_struct(struct signal_struct *sig)
 {
 	taskstats_tgid_free(sig);
+	sched_autogroup_exit(sig);
 	kmem_cache_free(signal_cachep, sig);
 }
 
 static inline void put_signal_struct(struct signal_struct *sig)
 {
-	if (atomic_dec_and_test(&sig->sigcnt)) {
-		sched_autogroup_exit(sig);
+	if (atomic_dec_and_test(&sig->sigcnt))
 		free_signal_struct(sig);
-	}
 }
 
 void __put_task_struct(struct task_struct *tsk)
@@ -1286,7 +1285,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 			attach_pid(p, PIDTYPE_SID, task_session(current));
 			list_add_tail(&p->sibling, &p->real_parent->children);
 			list_add_tail_rcu(&p->tasks, &init_task.tasks);
-			__get_cpu_var(process_counts)++;
+			__this_cpu_inc(process_counts);
 		}
 		attach_pid(p, PIDTYPE_PID, pid);
 		nr_threads++;
@@ -1318,7 +1317,7 @@ bad_fork_cleanup_mm:
 	}
 bad_fork_cleanup_signal:
 	if (!(clone_flags & CLONE_THREAD))
-		put_signal_struct(p->signal);
+		free_signal_struct(p->signal);
 bad_fork_cleanup_sighand:
 	__cleanup_sighand(p->sighand);
 bad_fork_cleanup_fs:
diff --git a/kernel/freezer.c b/kernel/freezer.c
index bd1d42b17cb2..66ecd2ead215 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -104,8 +104,13 @@ bool freeze_task(struct task_struct *p, bool sig_only)
 	}
 
 	if (should_send_signal(p)) {
-		if (!signal_pending(p))
-			fake_signal_wake_up(p);
+		fake_signal_wake_up(p);
+		/*
+		 * fake_signal_wake_up() goes through p's scheduler
+		 * lock and guarantees that TASK_STOPPED/TRACED ->
+		 * TASK_RUNNING transition can't race with task state
+		 * testing in try_to_freeze_tasks().
+		 */
 	} else if (sig_only) {
 		return false;
 	} else {
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index f2429fc3438c..45da2b6920ab 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -497,7 +497,7 @@ static inline int hrtimer_is_hres_enabled(void)
  */
 static inline int hrtimer_hres_active(void)
 {
-	return __get_cpu_var(hrtimer_bases).hres_active;
+	return __this_cpu_read(hrtimer_bases.hres_active);
 }
 
 /*
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 91a5fa25054e..0caa59f747dd 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -577,7 +577,7 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
  */
 static int irq_thread(void *data)
 {
-	static struct sched_param param = {
+	static const struct sched_param param = {
 		.sched_priority = MAX_USER_RT_PRIO/2,
 	};
 	struct irqaction *action = data;
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 90f881904bb1..c58fa7da8aef 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -77,21 +77,21 @@ void __weak arch_irq_work_raise(void)
  */
 static void __irq_work_queue(struct irq_work *entry)
 {
-	struct irq_work **head, *next;
+	struct irq_work *next;
 
-	head = &get_cpu_var(irq_work_list);
+	preempt_disable();
 
 	do {
-		next = *head;
+		next = __this_cpu_read(irq_work_list);
 		/* Can assign non-atomic because we keep the flags set. */
 		entry->next = next_flags(next, IRQ_WORK_FLAGS);
-	} while (cmpxchg(head, next, entry) != next);
+	} while (this_cpu_cmpxchg(irq_work_list, next, entry) != next);
 
 	/* The list was empty, raise self-interrupt to start processing. */
 	if (!irq_work_next(entry))
 		arch_irq_work_raise();
 
-	put_cpu_var(irq_work_list);
+	preempt_enable();
 }
 
 /*
@@ -120,16 +120,16 @@ EXPORT_SYMBOL_GPL(irq_work_queue);
  */
 void irq_work_run(void)
 {
-	struct irq_work *list, **head;
+	struct irq_work *list;
 
-	head = &__get_cpu_var(irq_work_list);
-	if (*head == NULL)
+	if (this_cpu_read(irq_work_list) == NULL)
 		return;
 
 	BUG_ON(!in_irq());
 	BUG_ON(!irqs_disabled());
 
-	list = xchg(head, NULL);
+	list = this_cpu_xchg(irq_work_list, NULL);
+
 	while (list != NULL) {
 		struct irq_work *entry = list;
 
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 7663e5df0e6f..77981813a1e7 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -317,12 +317,12 @@ void __kprobes free_optinsn_slot(kprobe_opcode_t * slot, int dirty)
 /* We have preemption disabled.. so it is safe to use __ versions */
 static inline void set_kprobe_instance(struct kprobe *kp)
 {
-	__get_cpu_var(kprobe_instance) = kp;
+	__this_cpu_write(kprobe_instance, kp);
 }
 
 static inline void reset_kprobe_instance(void)
 {
-	__get_cpu_var(kprobe_instance) = NULL;
+	__this_cpu_write(kprobe_instance, NULL);
 }
 
 /*
@@ -965,7 +965,7 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
 static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
 					int trapnr)
 {
-	struct kprobe *cur = __get_cpu_var(kprobe_instance);
+	struct kprobe *cur = __this_cpu_read(kprobe_instance);
 
 	/*
 	 * if we faulted "during" the execution of a user specified
@@ -980,7 +980,7 @@ static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
 
 static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
 {
-	struct kprobe *cur = __get_cpu_var(kprobe_instance);
+	struct kprobe *cur = __this_cpu_read(kprobe_instance);
 	int ret = 0;
 
 	if (cur && cur->break_handler) {
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 5355cfd44a3f..c55afba990a3 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -148,7 +148,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
 	wait_for_completion(&create.done);
 
 	if (!IS_ERR(create.result)) {
-		static struct sched_param param = { .sched_priority = 0 };
+		static const struct sched_param param = { .sched_priority = 0 };
 		va_list args;
 
 		va_start(args, namefmt);
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index f9063c6b185d..b75597235d85 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -1,7 +1,4 @@
-
-ifeq ($(CONFIG_PM_DEBUG),y)
-EXTRA_CFLAGS	+=	-DDEBUG
-endif
+ccflags-$(CONFIG_PM_DEBUG)	:=	-DDEBUG
 
 obj-$(CONFIG_PM)		+= main.o
 obj-$(CONFIG_PM_SLEEP)		+= console.o
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 048d0b514831..870f72bc72ae 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -62,7 +62,7 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
 {
 	if (ops && !(ops->begin && ops->end &&  ops->pre_snapshot
 	    && ops->prepare && ops->finish && ops->enter && ops->pre_restore
-	    && ops->restore_cleanup)) {
+	    && ops->restore_cleanup && ops->leave)) {
 		WARN_ON(1);
 		return;
 	}
@@ -278,7 +278,7 @@ static int create_image(int platform_mode)
 		goto Enable_irqs;
 	}
 
-	if (hibernation_test(TEST_CORE) || !pm_check_wakeup_events())
+	if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
 		goto Power_up;
 
 	in_suspend = 1;
@@ -516,7 +516,7 @@ int hibernation_platform_enter(void)
 
 	local_irq_disable();
 	sysdev_suspend(PMSG_HIBERNATE);
-	if (!pm_check_wakeup_events()) {
+	if (pm_wakeup_pending()) {
 		error = -EAGAIN;
 		goto Power_up;
 	}
@@ -647,6 +647,7 @@ int hibernate(void)
 		swsusp_free();
 		if (!error)
 			power_down();
+		in_suspend = 0;
 		pm_restore_gfp_mask();
 	} else {
 		pr_debug("PM: Image restored successfully.\n");
diff --git a/kernel/power/process.c b/kernel/power/process.c
index e50b4c1b2a0f..d6d2a10320e0 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -64,6 +64,12 @@ static int try_to_freeze_tasks(bool sig_only)
 			 * perturb a task in TASK_STOPPED or TASK_TRACED.
 			 * It is "frozen enough".  If the task does wake
 			 * up, it will immediately call try_to_freeze.
+			 *
+			 * Because freeze_task() goes through p's
+			 * scheduler lock after setting TIF_FREEZE, it's
+			 * guaranteed that either we see TASK_RUNNING or
+			 * try_to_stop() after schedule() in ptrace/signal
+			 * stop sees TIF_FREEZE.
 			 */
 			if (!task_is_stopped_or_traced(p) &&
 			    !freezer_should_skip(p))
@@ -79,7 +85,7 @@ static int try_to_freeze_tasks(bool sig_only)
 		if (!todo || time_after(jiffies, end_time))
 			break;
 
-		if (!pm_check_wakeup_events()) {
+		if (pm_wakeup_pending()) {
 			wakeup = true;
 			break;
 		}
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 031d5e3a6197..8850df68794d 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -164,7 +164,7 @@ static int suspend_enter(suspend_state_t state)
 
 	error = sysdev_suspend(PMSG_SUSPEND);
 	if (!error) {
-		if (!suspend_test(TEST_CORE) && pm_check_wakeup_events()) {
+		if (!(suspend_test(TEST_CORE) || pm_wakeup_pending())) {
 			error = suspend_ops->enter(state);
 			events_check_enabled = false;
 		}
diff --git a/kernel/printk.c b/kernel/printk.c
index ab3ffc5b3b64..f64b8997fc76 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -43,12 +43,6 @@
 #include <asm/uaccess.h>
 
 /*
- * for_each_console() allows you to iterate on each console
- */
-#define for_each_console(con) \
-	for (con = console_drivers; con != NULL; con = con->next)
-
-/*
  * Architectures can override it:
  */
 void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...)
@@ -279,12 +273,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
 	 * at open time.
 	 */
 	if (type == SYSLOG_ACTION_OPEN || !from_file) {
-		if (dmesg_restrict && !capable(CAP_SYS_ADMIN))
-			return -EPERM;
+		if (dmesg_restrict && !capable(CAP_SYSLOG))
+			goto warn; /* switch to return -EPERM after 2.6.39 */
 		if ((type != SYSLOG_ACTION_READ_ALL &&
 		     type != SYSLOG_ACTION_SIZE_BUFFER) &&
-		    !capable(CAP_SYS_ADMIN))
-			return -EPERM;
+		    !capable(CAP_SYSLOG))
+			goto warn; /* switch to return -EPERM after 2.6.39 */
 	}
 
 	error = security_syslog(type);
@@ -428,6 +422,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
 	}
 out:
 	return error;
+warn:
+	/* remove after 2.6.39 */
+	if (capable(CAP_SYS_ADMIN))
+		WARN_ONCE(1, "Attempt to access syslog with CAP_SYS_ADMIN "
+		  "but no CAP_SYSLOG (deprecated and denied).\n");
+	return -EPERM;
 }
 
 SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
@@ -1359,6 +1359,7 @@ void register_console(struct console *newcon)
 		spin_unlock_irqrestore(&logbuf_lock, flags);
 	}
 	release_console_sem();
+	console_sysfs_notify();
 
 	/*
 	 * By unregistering the bootconsoles after we enable the real console
@@ -1417,6 +1418,7 @@ int unregister_console(struct console *console)
 		console_drivers->flags |= CON_CONSDEV;
 
 	release_console_sem();
+	console_sysfs_notify();
 	return res;
 }
 EXPORT_SYMBOL(unregister_console);
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index d0ddfea6579d..dd4aea806f8e 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -364,8 +364,8 @@ void rcu_irq_exit(void)
 	WARN_ON_ONCE(rdtp->dynticks & 0x1);
 
 	/* If the interrupt queued a callback, get out of dyntick mode. */
-	if (__get_cpu_var(rcu_sched_data).nxtlist ||
-	    __get_cpu_var(rcu_bh_data).nxtlist)
+	if (__this_cpu_read(rcu_sched_data.nxtlist) ||
+	    __this_cpu_read(rcu_bh_data.nxtlist))
 		set_need_resched();
 }
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 04949089e760..a0eb0941fa84 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -278,14 +278,12 @@ struct task_group {
 #endif
 };
 
-#define root_task_group init_task_group
-
 /* task_group_lock serializes the addition/removal of task groups */
 static DEFINE_SPINLOCK(task_group_lock);
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
 
-# define INIT_TASK_GROUP_LOAD	NICE_0_LOAD
+# define ROOT_TASK_GROUP_LOAD	NICE_0_LOAD
 
 /*
  * A weight of 0 or 1 can cause arithmetics problems.
@@ -298,13 +296,13 @@ static DEFINE_SPINLOCK(task_group_lock);
 #define MIN_SHARES	2
 #define MAX_SHARES	(1UL << 18)
 
-static int init_task_group_load = INIT_TASK_GROUP_LOAD;
+static int root_task_group_load = ROOT_TASK_GROUP_LOAD;
 #endif
 
 /* Default task group.
  *	Every task in system belong to this group at bootup.
  */
-struct task_group init_task_group;
+struct task_group root_task_group;
 
 #endif	/* CONFIG_CGROUP_SCHED */
 
@@ -743,7 +741,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
 	buf[cnt] = 0;
 	cmp = strstrip(buf);
 
-	if (strncmp(buf, "NO_", 3) == 0) {
+	if (strncmp(cmp, "NO_", 3) == 0) {
 		neg = 1;
 		cmp += 3;
 	}
@@ -7848,7 +7846,7 @@ static void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
 	cfs_rq->tg = tg;
 
 	tg->se[cpu] = se;
-	/* se could be NULL for init_task_group */
+	/* se could be NULL for root_task_group */
 	if (!se)
 		return;
 
@@ -7908,18 +7906,18 @@ void __init sched_init(void)
 		ptr = (unsigned long)kzalloc(alloc_size, GFP_NOWAIT);
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-		init_task_group.se = (struct sched_entity **)ptr;
+		root_task_group.se = (struct sched_entity **)ptr;
 		ptr += nr_cpu_ids * sizeof(void **);
 
-		init_task_group.cfs_rq = (struct cfs_rq **)ptr;
+		root_task_group.cfs_rq = (struct cfs_rq **)ptr;
 		ptr += nr_cpu_ids * sizeof(void **);
 
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 #ifdef CONFIG_RT_GROUP_SCHED
-		init_task_group.rt_se = (struct sched_rt_entity **)ptr;
+		root_task_group.rt_se = (struct sched_rt_entity **)ptr;
 		ptr += nr_cpu_ids * sizeof(void **);
 
-		init_task_group.rt_rq = (struct rt_rq **)ptr;
+		root_task_group.rt_rq = (struct rt_rq **)ptr;
 		ptr += nr_cpu_ids * sizeof(void **);
 
 #endif /* CONFIG_RT_GROUP_SCHED */
@@ -7939,13 +7937,13 @@ void __init sched_init(void)
 			global_rt_period(), global_rt_runtime());
 
 #ifdef CONFIG_RT_GROUP_SCHED
-	init_rt_bandwidth(&init_task_group.rt_bandwidth,
+	init_rt_bandwidth(&root_task_group.rt_bandwidth,
 			global_rt_period(), global_rt_runtime());
 #endif /* CONFIG_RT_GROUP_SCHED */
 
 #ifdef CONFIG_CGROUP_SCHED
-	list_add(&init_task_group.list, &task_groups);
-	INIT_LIST_HEAD(&init_task_group.children);
+	list_add(&root_task_group.list, &task_groups);
+	INIT_LIST_HEAD(&root_task_group.children);
 	autogroup_init(&init_task);
 #endif /* CONFIG_CGROUP_SCHED */
 
@@ -7960,34 +7958,34 @@ void __init sched_init(void)
 		init_cfs_rq(&rq->cfs, rq);
 		init_rt_rq(&rq->rt, rq);
 #ifdef CONFIG_FAIR_GROUP_SCHED
-		init_task_group.shares = init_task_group_load;
+		root_task_group.shares = root_task_group_load;
 		INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
 		/*
-		 * How much cpu bandwidth does init_task_group get?
+		 * How much cpu bandwidth does root_task_group get?
 		 *
 		 * In case of task-groups formed thr' the cgroup filesystem, it
 		 * gets 100% of the cpu resources in the system. This overall
 		 * system cpu resource is divided among the tasks of
-		 * init_task_group and its child task-groups in a fair manner,
+		 * root_task_group and its child task-groups in a fair manner,
 		 * based on each entity's (task or task-group's) weight
 		 * (se->load.weight).
 		 *
-		 * In other words, if init_task_group has 10 tasks of weight
+		 * In other words, if root_task_group has 10 tasks of weight
 		 * 1024) and two child groups A0 and A1 (of weight 1024 each),
 		 * then A0's share of the cpu resource is:
 		 *
 		 *	A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
 		 *
-		 * We achieve this by letting init_task_group's tasks sit
-		 * directly in rq->cfs (i.e init_task_group->se[] = NULL).
+		 * We achieve this by letting root_task_group's tasks sit
+		 * directly in rq->cfs (i.e root_task_group->se[] = NULL).
 		 */
-		init_tg_cfs_entry(&init_task_group, &rq->cfs, NULL, i, NULL);
+		init_tg_cfs_entry(&root_task_group, &rq->cfs, NULL, i, NULL);
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
 		rq->rt.rt_runtime = def_rt_bandwidth.rt_runtime;
 #ifdef CONFIG_RT_GROUP_SCHED
 		INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
-		init_tg_rt_entry(&init_task_group, &rq->rt, NULL, i, NULL);
+		init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, NULL);
 #endif
 
 		for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
@@ -8379,6 +8377,7 @@ static void free_sched_group(struct task_group *tg)
 {
 	free_fair_sched_group(tg);
 	free_rt_sched_group(tg);
+	autogroup_free(tg);
 	kfree(tg);
 }
 
@@ -8812,7 +8811,7 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
 
 	if (!cgrp->parent) {
 		/* This is early initialization for the top cgroup */
-		return &init_task_group.css;
+		return &root_task_group.css;
 	}
 
 	parent = cgroup_tg(cgrp->parent);
diff --git a/kernel/sched_autogroup.c b/kernel/sched_autogroup.c
index c80fedcd476b..32a723b8f84c 100644
--- a/kernel/sched_autogroup.c
+++ b/kernel/sched_autogroup.c
@@ -9,10 +9,10 @@ unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
 static struct autogroup autogroup_default;
 static atomic_t autogroup_seq_nr;
 
-static void autogroup_init(struct task_struct *init_task)
+static void __init autogroup_init(struct task_struct *init_task)
 {
-	autogroup_default.tg = &init_task_group;
-	init_task_group.autogroup = &autogroup_default;
+	autogroup_default.tg = &root_task_group;
+	root_task_group.autogroup = &autogroup_default;
 	kref_init(&autogroup_default.kref);
 	init_rwsem(&autogroup_default.lock);
 	init_task->signal->autogroup = &autogroup_default;
@@ -63,7 +63,7 @@ static inline struct autogroup *autogroup_create(void)
 	if (!ag)
 		goto out_fail;
 
-	tg = sched_create_group(&init_task_group);
+	tg = sched_create_group(&root_task_group);
 
 	if (IS_ERR(tg))
 		goto out_free;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index d4d918a91881..0823778f87fc 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -70,7 +70,7 @@ char *softirq_to_name[NR_SOFTIRQS] = {
 static void wakeup_softirqd(void)
 {
 	/* Interrupts are disabled: no need to stop preemption */
-	struct task_struct *tsk = __get_cpu_var(ksoftirqd);
+	struct task_struct *tsk = __this_cpu_read(ksoftirqd);
 
 	if (tsk && tsk->state != TASK_RUNNING)
 		wake_up_process(tsk);
@@ -388,8 +388,8 @@ void __tasklet_schedule(struct tasklet_struct *t)
 
 	local_irq_save(flags);
 	t->next = NULL;
-	*__get_cpu_var(tasklet_vec).tail = t;
-	__get_cpu_var(tasklet_vec).tail = &(t->next);
+	*__this_cpu_read(tasklet_vec.tail) = t;
+	__this_cpu_write(tasklet_vec.tail, &(t->next));
 	raise_softirq_irqoff(TASKLET_SOFTIRQ);
 	local_irq_restore(flags);
 }
@@ -402,8 +402,8 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
 
 	local_irq_save(flags);
 	t->next = NULL;
-	*__get_cpu_var(tasklet_hi_vec).tail = t;
-	__get_cpu_var(tasklet_hi_vec).tail = &(t->next);
+	*__this_cpu_read(tasklet_hi_vec.tail) = t;
+	__this_cpu_write(tasklet_hi_vec.tail,  &(t->next));
 	raise_softirq_irqoff(HI_SOFTIRQ);
 	local_irq_restore(flags);
 }
@@ -414,8 +414,8 @@ void __tasklet_hi_schedule_first(struct tasklet_struct *t)
 {
 	BUG_ON(!irqs_disabled());
 
-	t->next = __get_cpu_var(tasklet_hi_vec).head;
-	__get_cpu_var(tasklet_hi_vec).head = t;
+	t->next = __this_cpu_read(tasklet_hi_vec.head);
+	__this_cpu_write(tasklet_hi_vec.head, t);
 	__raise_softirq_irqoff(HI_SOFTIRQ);
 }
 
@@ -426,9 +426,9 @@ static void tasklet_action(struct softirq_action *a)
 	struct tasklet_struct *list;
 
 	local_irq_disable();
-	list = __get_cpu_var(tasklet_vec).head;
-	__get_cpu_var(tasklet_vec).head = NULL;
-	__get_cpu_var(tasklet_vec).tail = &__get_cpu_var(tasklet_vec).head;
+	list = __this_cpu_read(tasklet_vec.head);
+	__this_cpu_write(tasklet_vec.head, NULL);
+	__this_cpu_write(tasklet_vec.tail, &__get_cpu_var(tasklet_vec).head);
 	local_irq_enable();
 
 	while (list) {
@@ -449,8 +449,8 @@ static void tasklet_action(struct softirq_action *a)
 
 		local_irq_disable();
 		t->next = NULL;
-		*__get_cpu_var(tasklet_vec).tail = t;
-		__get_cpu_var(tasklet_vec).tail = &(t->next);
+		*__this_cpu_read(tasklet_vec.tail) = t;
+		__this_cpu_write(tasklet_vec.tail, &(t->next));
 		__raise_softirq_irqoff(TASKLET_SOFTIRQ);
 		local_irq_enable();
 	}
@@ -461,9 +461,9 @@ static void tasklet_hi_action(struct softirq_action *a)
 	struct tasklet_struct *list;
 
 	local_irq_disable();
-	list = __get_cpu_var(tasklet_hi_vec).head;
-	__get_cpu_var(tasklet_hi_vec).head = NULL;
-	__get_cpu_var(tasklet_hi_vec).tail = &__get_cpu_var(tasklet_hi_vec).head;
+	list = __this_cpu_read(tasklet_hi_vec.head);
+	__this_cpu_write(tasklet_hi_vec.head, NULL);
+	__this_cpu_write(tasklet_hi_vec.tail, &__get_cpu_var(tasklet_hi_vec).head);
 	local_irq_enable();
 
 	while (list) {
@@ -484,8 +484,8 @@ static void tasklet_hi_action(struct softirq_action *a)
 
 		local_irq_disable();
 		t->next = NULL;
-		*__get_cpu_var(tasklet_hi_vec).tail = t;
-		__get_cpu_var(tasklet_hi_vec).tail = &(t->next);
+		*__this_cpu_read(tasklet_hi_vec.tail) = t;
+		__this_cpu_write(tasklet_hi_vec.tail, &(t->next));
 		__raise_softirq_irqoff(HI_SOFTIRQ);
 		local_irq_enable();
 	}
@@ -802,16 +802,16 @@ static void takeover_tasklets(unsigned int cpu)
 
 	/* Find end, append list for that CPU. */
 	if (&per_cpu(tasklet_vec, cpu).head != per_cpu(tasklet_vec, cpu).tail) {
-		*(__get_cpu_var(tasklet_vec).tail) = per_cpu(tasklet_vec, cpu).head;
-		__get_cpu_var(tasklet_vec).tail = per_cpu(tasklet_vec, cpu).tail;
+		*__this_cpu_read(tasklet_vec.tail) = per_cpu(tasklet_vec, cpu).head;
+		this_cpu_write(tasklet_vec.tail, per_cpu(tasklet_vec, cpu).tail);
 		per_cpu(tasklet_vec, cpu).head = NULL;
 		per_cpu(tasklet_vec, cpu).tail = &per_cpu(tasklet_vec, cpu).head;
 	}
 	raise_softirq_irqoff(TASKLET_SOFTIRQ);
 
 	if (&per_cpu(tasklet_hi_vec, cpu).head != per_cpu(tasklet_hi_vec, cpu).tail) {
-		*__get_cpu_var(tasklet_hi_vec).tail = per_cpu(tasklet_hi_vec, cpu).head;
-		__get_cpu_var(tasklet_hi_vec).tail = per_cpu(tasklet_hi_vec, cpu).tail;
+		*__this_cpu_read(tasklet_hi_vec.tail) = per_cpu(tasklet_hi_vec, cpu).head;
+		__this_cpu_write(tasklet_hi_vec.tail, per_cpu(tasklet_hi_vec, cpu).tail);
 		per_cpu(tasklet_hi_vec, cpu).head = NULL;
 		per_cpu(tasklet_hi_vec, cpu).tail = &per_cpu(tasklet_hi_vec, cpu).head;
 	}
@@ -853,7 +853,7 @@ static int __cpuinit cpu_callback(struct notifier_block *nfb,
 			     cpumask_any(cpu_online_mask));
 	case CPU_DEAD:
 	case CPU_DEAD_FROZEN: {
-		static struct sched_param param = {
+		static const struct sched_param param = {
 			.sched_priority = MAX_RT_PRIO-1
 		};
 
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 3308fd7f1b52..69691eb4b715 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -89,8 +89,7 @@ static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
 		return -ENOMEM;
 
 	if (!info) {
-		int seq = get_cpu_var(taskstats_seqnum)++;
-		put_cpu_var(taskstats_seqnum);
+		int seq = this_cpu_inc_return(taskstats_seqnum) - 1;
 
 		reply = genlmsg_put(skb, 0, seq, &family, 0, cmd);
 	} else
@@ -612,7 +611,7 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
 		fill_tgid_exit(tsk);
 	}
 
-	listeners = &__raw_get_cpu_var(listener_array);
+	l