Merge branch 'akpm' (patchbomb from Andrew) into next

Merge misc updates from Andrew Morton:

 - a few fixes for 3.16.  Cc'ed to stable so they'll get there somehow.

 - various misc fixes and cleanups

 - most of the ocfs2 queue.  Review is slow...

 - most of MM.  The MM queue is pretty huge this time, but not much in
   the way of feature work.

 - some tweaks under kernel/

 - printk maintenance work

 - updates to lib/

 - checkpatch updates

 - tweaks to init/

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (276 commits)
  fs/autofs4/dev-ioctl.c: add __init to autofs_dev_ioctl_init
  fs/ncpfs/getopt.c: replace simple_strtoul by kstrtoul
  init/main.c: remove an ifdef
  kthreads: kill CLONE_KERNEL, change kernel_thread(kernel_init) to avoid CLONE_SIGHAND
  init/main.c: add initcall_blacklist kernel parameter
  init/main.c: don't use pr_debug()
  fs/binfmt_flat.c: make old_reloc() static
  fs/binfmt_elf.c: fix bool assignements
  fs/efs: convert printk(KERN_DEBUG to pr_debug
  fs/efs: add pr_fmt / use __func__
  fs/efs: convert printk to pr_foo()
  scripts/checkpatch.pl: device_initcall is not the only __initcall substitute
  checkpatch: check stable email address
  checkpatch: warn on unnecessary void function return statements
  checkpatch: prefer kstrto<foo> to sscanf(buf, "%<lhuidx>", &bar);
  checkpatch: add warning for kmalloc/kzalloc with multiply
  checkpatch: warn on #defines ending in semicolon
  checkpatch: make --strict a default for files in drivers/net and net/
  checkpatch: always warn on missing blank line after variable declaration block
  checkpatch: fix wildcard DT compatible string checking
  ...

kernel/backtracetest.c

@@ -19,8 +19,8 @@
 
 static void backtrace_test_normal(void)
 {
-	printk("Testing a backtrace from process context.\n");
-	printk("The following trace is a kernel self test and not a bug!\n");
+	pr_info("Testing a backtrace from process context.\n");
+	pr_info("The following trace is a kernel self test and not a bug!\n");
 
 	dump_stack();
 }
@@ -37,8 +37,8 @@ static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
 
 static void backtrace_test_irq(void)
 {
-	printk("Testing a backtrace from irq context.\n");
-	printk("The following trace is a kernel self test and not a bug!\n");
+	pr_info("Testing a backtrace from irq context.\n");
+	pr_info("The following trace is a kernel self test and not a bug!\n");
 
 	init_completion(&backtrace_work);
 	tasklet_schedule(&backtrace_tasklet);
@@ -51,8 +51,8 @@ static void backtrace_test_saved(void)
 	struct stack_trace trace;
 	unsigned long entries[8];
 
-	printk("Testing a saved backtrace.\n");
-	printk("The following trace is a kernel self test and not a bug!\n");
+	pr_info("Testing a saved backtrace.\n");
+	pr_info("The following trace is a kernel self test and not a bug!\n");
 
 	trace.nr_entries = 0;
 	trace.max_entries = ARRAY_SIZE(entries);
@@ -65,19 +65,19 @@ static void backtrace_test_saved(void)
 #else
 static void backtrace_test_saved(void)
 {
-	printk("Saved backtrace test skipped.\n");
+	pr_info("Saved backtrace test skipped.\n");
 }
 #endif
 
 static int backtrace_regression_test(void)
 {
-	printk("====[ backtrace testing ]===========\n");
+	pr_info("====[ backtrace testing ]===========\n");
 
 	backtrace_test_normal();
 	backtrace_test_irq();
 	backtrace_test_saved();
 
-	printk("====[ end of backtrace testing ]====\n");
+	pr_info("====[ end of backtrace testing ]====\n");
 	return 0;
 }
 

kernel/capability.c

@@ -24,7 +24,6 @@
  */
 
 const kernel_cap_t __cap_empty_set = CAP_EMPTY_SET;
-
 EXPORT_SYMBOL(__cap_empty_set);
 
 int file_caps_enabled = 1;
@@ -189,7 +188,7 @@ SYSCALL_DEFINE2(capget, cap_user_header_t, header, cap_user_data_t, dataptr)
 		 *
 		 * An alternative would be to return an error here
 		 * (-ERANGE), but that causes legacy applications to
-		 * unexpectidly fail; the capget/modify/capset aborts
+		 * unexpectedly fail; the capget/modify/capset aborts
 		 * before modification is attempted and the application
 		 * fails.
 		 */
@@ -395,7 +394,8 @@ EXPORT_SYMBOL(ns_capable);
  * This does not set PF_SUPERPRIV because the caller may not
  * actually be privileged.
  */
-bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap)
+bool file_ns_capable(const struct file *file, struct user_namespace *ns,
+		     int cap)
 {
 	if (WARN_ON_ONCE(!cap_valid(cap)))
 		return false;

kernel/compat.c

@@ -157,7 +157,7 @@ static int __compat_put_timespec(const struct timespec *ts, struct compat_timesp
 int compat_get_timeval(struct timeval *tv, const void __user *utv)
 {
 	if (COMPAT_USE_64BIT_TIME)
-		return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
+		return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
 	else
 		return __compat_get_timeval(tv, utv);
 }
@@ -166,7 +166,7 @@ EXPORT_SYMBOL_GPL(compat_get_timeval);
 int compat_put_timeval(const struct timeval *tv, void __user *utv)
 {
 	if (COMPAT_USE_64BIT_TIME)
-		return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
+		return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
 	else
 		return __compat_put_timeval(tv, utv);
 }
@@ -175,7 +175,7 @@ EXPORT_SYMBOL_GPL(compat_put_timeval);
 int compat_get_timespec(struct timespec *ts, const void __user *uts)
 {
 	if (COMPAT_USE_64BIT_TIME)
-		return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
+		return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
 	else
 		return __compat_get_timespec(ts, uts);
 }
@@ -184,7 +184,7 @@ EXPORT_SYMBOL_GPL(compat_get_timespec);
 int compat_put_timespec(const struct timespec *ts, void __user *uts)
 {
 	if (COMPAT_USE_64BIT_TIME)
-		return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
+		return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
 	else
 		return __compat_put_timespec(ts, uts);
 }

kernel/cpu.c

@@ -283,8 +283,7 @@ static inline void check_for_tasks(int cpu)
 		task_cputime(p, &utime, &stime);
 		if (task_cpu(p) == cpu && p->state == TASK_RUNNING &&
 		    (utime || stime))
-			printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d "
-				"(state = %ld, flags = %x)\n",
+			pr_warn("Task %s (pid = %d) is on cpu %d (state = %ld, flags = %x)\n",
 				p->comm, task_pid_nr(p), cpu,
 				p->state, p->flags);
 	}
@@ -336,8 +335,8 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
 	if (err) {
 		nr_calls--;
 		__cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL);
-		printk("%s: attempt to take down CPU %u failed\n",
-				__func__, cpu);
+		pr_warn("%s: attempt to take down CPU %u failed\n",
+			__func__, cpu);
 		goto out_release;
 	}
 
@@ -444,8 +443,8 @@ static int _cpu_up(unsigned int cpu, int tasks_frozen)
 	ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls);
 	if (ret) {
 		nr_calls--;
-		printk(KERN_WARNING "%s: attempt to bring up CPU %u failed\n",
-				__func__, cpu);
+		pr_warn("%s: attempt to bring up CPU %u failed\n",
+			__func__, cpu);
 		goto out_notify;
 	}
 
@@ -475,11 +474,10 @@ int cpu_up(unsigned int cpu)
 	int err = 0;
 
 	if (!cpu_possible(cpu)) {
-		printk(KERN_ERR "can't online cpu %d because it is not "
-			"configured as may-hotadd at boot time\n", cpu);
+		pr_err("can't online cpu %d because it is not configured as may-hotadd at boot time\n",
+		       cpu);
 #if defined(CONFIG_IA64)
-		printk(KERN_ERR "please check additional_cpus= boot "
-				"parameter\n");
+		pr_err("please check additional_cpus= boot parameter\n");
 #endif
 		return -EINVAL;
 	}
@@ -518,7 +516,7 @@ int disable_nonboot_cpus(void)
 	 */
 	cpumask_clear(frozen_cpus);
 
-	printk("Disabling non-boot CPUs ...\n");
+	pr_info("Disabling non-boot CPUs ...\n");
 	for_each_online_cpu(cpu) {
 		if (cpu == first_cpu)
 			continue;
@@ -526,8 +524,7 @@ int disable_nonboot_cpus(void)
 		if (!error)
 			cpumask_set_cpu(cpu, frozen_cpus);
 		else {
-			printk(KERN_ERR "Error taking CPU%d down: %d\n",
-				cpu, error);
+			pr_err("Error taking CPU%d down: %d\n", cpu, error);
 			break;
 		}
 	}
@@ -537,7 +534,7 @@ int disable_nonboot_cpus(void)
 		/* Make sure the CPUs won't be enabled by someone else */
 		cpu_hotplug_disabled = 1;
 	} else {
-		printk(KERN_ERR "Non-boot CPUs are not disabled\n");
+		pr_err("Non-boot CPUs are not disabled\n");
 	}
 	cpu_maps_update_done();
 	return error;
@@ -561,17 +558,17 @@ void __ref enable_nonboot_cpus(void)
 	if (cpumask_empty(frozen_cpus))
 		goto out;
 
-	printk(KERN_INFO "Enabling non-boot CPUs ...\n");
+	pr_info("Enabling non-boot CPUs ...\n");
 
 	arch_enable_nonboot_cpus_begin();
 
 	for_each_cpu(cpu, frozen_cpus) {
 		error = _cpu_up(cpu, 1);
 		if (!error) {
-			printk(KERN_INFO "CPU%d is up\n", cpu);
+			pr_info("CPU%d is up\n", cpu);
 			continue;
 		}
-		printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error);
+		pr_warn("Error taking CPU%d up: %d\n", cpu, error);
 	}
 
 	arch_enable_nonboot_cpus_end();

kernel/cpuset.c

@@ -61,12 +61,7 @@
 #include <linux/cgroup.h>
 #include <linux/wait.h>
 
-/*
- * Tracks how many cpusets are currently defined in system.
- * When there is only one cpuset (the root cpuset) we can
- * short circuit some hooks.
- */
-int number_of_cpusets __read_mostly;
+struct static_key cpusets_enabled_key __read_mostly = STATIC_KEY_INIT_FALSE;
 
 /* See "Frequency meter" comments, below. */
 
@@ -611,7 +606,7 @@ static int generate_sched_domains(cpumask_var_t **domains,
 		goto done;
 	}
 
-	csa = kmalloc(number_of_cpusets * sizeof(cp), GFP_KERNEL);
+	csa = kmalloc(nr_cpusets() * sizeof(cp), GFP_KERNEL);
 	if (!csa)
 		goto done;
 	csn = 0;
@@ -1888,7 +1883,7 @@ static int cpuset_css_online(struct cgroup_subsys_state *css)
 	if (is_spread_slab(parent))
 		set_bit(CS_SPREAD_SLAB, &cs->flags);
 
-	number_of_cpusets++;
+	cpuset_inc();
 
 	if (!test_bit(CGRP_CPUSET_CLONE_CHILDREN, &css->cgroup->flags))
 		goto out_unlock;
@@ -1939,7 +1934,7 @@ static void cpuset_css_offline(struct cgroup_subsys_state *css)
 	if (is_sched_load_balance(cs))
 		update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);
 
-	number_of_cpusets--;
+	cpuset_dec();
 	clear_bit(CS_ONLINE, &cs->flags);
 
 	mutex_unlock(&cpuset_mutex);
@@ -1992,7 +1987,6 @@ int __init cpuset_init(void)
 	if (!alloc_cpumask_var(&cpus_attach, GFP_KERNEL))
 		BUG();
 
-	number_of_cpusets = 1;
 	return 0;
 }
 

kernel/debug/kdb/kdb_bt.c

@@ -21,7 +21,7 @@
 static void kdb_show_stack(struct task_struct *p, void *addr)
 {
 	int old_lvl = console_loglevel;
-	console_loglevel = 15;
+	console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
 	kdb_trap_printk++;
 	kdb_set_current_task(p);
 	if (addr) {

kernel/debug/kdb/kdb_io.c

@@ -710,7 +710,7 @@ kdb_printit:
 	}
 	if (logging) {
 		saved_loglevel = console_loglevel;
-		console_loglevel = 0;
+		console_loglevel = CONSOLE_LOGLEVEL_SILENT;
 		printk(KERN_INFO "%s", kdb_buffer);
 	}
 

kernel/debug/kdb/kdb_main.c

@@ -1091,7 +1091,7 @@ static int kdb_reboot(int argc, const char **argv)
 static void kdb_dumpregs(struct pt_regs *regs)
 {
 	int old_lvl = console_loglevel;
-	console_loglevel = 15;
+	console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
 	kdb_trap_printk++;
 	show_regs(regs);
 	kdb_trap_printk--;

kernel/exec_domain.c

@@ -37,7 +37,7 @@ static unsigned long ident_map[32] = {
 struct exec_domain default_exec_domain = {
 	.name		= "Linux",		/* name */
 	.handler	= default_handler,	/* lcall7 causes a seg fault. */
-	.pers_low	= 0, 			/* PER_LINUX personality. */
+	.pers_low	= 0,			/* PER_LINUX personality. */
 	.pers_high	= 0,			/* PER_LINUX personality. */
 	.signal_map	= ident_map,		/* Identity map signals. */
 	.signal_invmap	= ident_map,		/*  - both ways. */
@@ -83,7 +83,7 @@ lookup_exec_domain(unsigned int personality)
 	ep = &default_exec_domain;
 out:
 	read_unlock(&exec_domains_lock);
-	return (ep);
+	return ep;
 }
 
 int
@@ -110,8 +110,9 @@ register_exec_domain(struct exec_domain *ep)
 
 out:
 	write_unlock(&exec_domains_lock);
-	return (err);
+	return err;
 }
+EXPORT_SYMBOL(register_exec_domain);
 
 int
 unregister_exec_domain(struct exec_domain *ep)
@@ -133,6 +134,7 @@ unregister:
 	write_unlock(&exec_domains_lock);
 	return 0;
 }
+EXPORT_SYMBOL(unregister_exec_domain);
 
 int __set_personality(unsigned int personality)
 {
@@ -144,6 +146,7 @@ int __set_personality(unsigned int personality)
 
 	return 0;
 }
+EXPORT_SYMBOL(__set_personality);
 
 #ifdef CONFIG_PROC_FS
 static int execdomains_proc_show(struct seq_file *m, void *v)
@@ -188,8 +191,3 @@ SYSCALL_DEFINE1(personality, unsigned int, personality)
 
 	return old;
 }
-
-
-EXPORT_SYMBOL(register_exec_domain);
-EXPORT_SYMBOL(unregister_exec_domain);
-EXPORT_SYMBOL(__set_personality);

kernel/exit.c

@@ -352,7 +352,7 @@ int disallow_signal(int sig)
 
 EXPORT_SYMBOL(disallow_signal);
 
-#ifdef CONFIG_MM_OWNER
+#ifdef CONFIG_MEMCG
 /*
  * A task is exiting.   If it owned this mm, find a new owner for the mm.
  */
@@ -395,14 +395,18 @@ retry:
 	}
 
 	/*
-	 * Search through everything else. We should not get
-	 * here often
+	 * Search through everything else, we should not get here often.
 	 */
-	do_each_thread(g, c) {
-		if (c->mm == mm)
-			goto assign_new_owner;
-	} while_each_thread(g, c);
-
+	for_each_process(g) {
+		if (g->flags & PF_KTHREAD)
+			continue;
+		for_each_thread(g, c) {
+			if (c->mm == mm)
+				goto assign_new_owner;
+			if (c->mm)
+				break;
+		}
+	}
 	read_unlock(&tasklist_lock);
 	/*
 	 * We found no owner yet mm_users > 1: this implies that we are
@@ -434,7 +438,7 @@ assign_new_owner:
 	task_unlock(c);
 	put_task_struct(c);
 }
-#endif /* CONFIG_MM_OWNER */
+#endif /* CONFIG_MEMCG */
 
 /*
  * Turn us into a lazy TLB process if we

kernel/fork.c

@@ -150,15 +150,15 @@ void __weak arch_release_thread_info(struct thread_info *ti)
 static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
 						  int node)
 {
-	struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED,
-					     THREAD_SIZE_ORDER);
+	struct page *page = alloc_kmem_pages_node(node, THREADINFO_GFP,
+						  THREAD_SIZE_ORDER);
 
 	return page ? page_address(page) : NULL;
 }
 
 static inline void free_thread_info(struct thread_info *ti)
 {
-	free_memcg_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER);
+	free_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER);
 }
 # else
 static struct kmem_cache *thread_info_cache;
@@ -1099,12 +1099,12 @@ static void rt_mutex_init_task(struct task_struct *p)
 #endif
 }
 
-#ifdef CONFIG_MM_OWNER
+#ifdef CONFIG_MEMCG
 void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
 {
 	mm->owner = p;
 }
-#endif /* CONFIG_MM_OWNER */
+#endif /* CONFIG_MEMCG */
 
 /*
  * Initialize POSIX timer handling for a single task.

kernel/hung_task.c

@@ -52,8 +52,10 @@ unsigned int __read_mostly sysctl_hung_task_panic =
 
 static int __init hung_task_panic_setup(char *str)
 {
-	sysctl_hung_task_panic = simple_strtoul(str, NULL, 0);
+	int rc = kstrtouint(str, 0, &sysctl_hung_task_panic);
 
+	if (rc)
+		return rc;
 	return 1;
 }
 __setup("hung_task_panic=", hung_task_panic_setup);

kernel/kthread.c

@@ -262,7 +262,7 @@ static void create_kthread(struct kthread_create_info *create)
  * kthread_stop() has been called).  The return value should be zero
  * or a negative error number; it will be passed to kthread_stop().
  *
- * Returns a task_struct or ERR_PTR(-ENOMEM).
+ * Returns a task_struct or ERR_PTR(-ENOMEM) or ERR_PTR(-EINTR).
  */
 struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
 					   void *data, int node,
@@ -298,7 +298,7 @@ struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
 		 * that thread.
 		 */
 		if (xchg(&create->done, NULL))
-			return ERR_PTR(-ENOMEM);
+			return ERR_PTR(-EINTR);
 		/*
 		 * kthreadd (or new kernel thread) will call complete()
 		 * shortly.

kernel/latencytop.c

@@ -88,7 +88,8 @@ static void clear_global_latency_tracing(void)
 }
 
 static void __sched
-account_global_scheduler_latency(struct task_struct *tsk, struct latency_record *lat)
+account_global_scheduler_latency(struct task_struct *tsk,
+				 struct latency_record *lat)
 {
 	int firstnonnull = MAXLR + 1;
 	int i;
@@ -255,7 +256,7 @@ static int lstats_show(struct seq_file *m, void *v)
 					break;
 				seq_printf(m, " %ps", (void *)bt);
 			}
-			seq_printf(m, "\n");
+			seq_puts(m, "\n");
 		}
 	}
 	return 0;

kernel/reboot.c

@@ -388,15 +388,22 @@ static int __init reboot_setup(char *str)
 			break;
 
 		case 's':
-			if (isdigit(*(str+1)))
-				reboot_cpu = simple_strtoul(str+1, NULL, 0);
-			else if (str[1] == 'm' && str[2] == 'p' &&
-							isdigit(*(str+3)))
-				reboot_cpu = simple_strtoul(str+3, NULL, 0);
-			else
+		{
+			int rc;
+
+			if (isdigit(*(str+1))) {
+				rc = kstrtoint(str+1, 0, &reboot_cpu);
+				if (rc)
+					return rc;
+			} else if (str[1] == 'm' && str[2] == 'p' &&
+				   isdigit(*(str+3))) {
+				rc = kstrtoint(str+3, 0, &reboot_cpu);
+				if (rc)
+					return rc;
+			} else
 				reboot_mode = REBOOT_SOFT;
 			break;
-
+		}
 		case 'g':
 			reboot_mode = REBOOT_GPIO;
 			break;

kernel/res_counter.c

@@ -186,8 +186,11 @@ int res_counter_memparse_write_strategy(const char *buf,
 
 	/* return RES_COUNTER_MAX(unlimited) if "-1" is specified */
 	if (*buf == '-') {
-		res = simple_strtoull(buf + 1, &end, 10);
-		if (res != 1 || *end != '\0')
+		int rc = kstrtoull(buf + 1, 10, &res);
+
+		if (rc)
+			return rc;
+		if (res != 1)
 			return -EINVAL;
 		*resp = RES_COUNTER_MAX;
 		return 0;

kernel/sched/core.c

@@ -1367,7 +1367,7 @@ out:
 		 * leave kernel.
 		 */
 		if (p->mm && printk_ratelimit()) {
-			printk_sched("process %d (%s) no longer affine to cpu%d\n",
+			printk_deferred("process %d (%s) no longer affine to cpu%d\n",
 					task_pid_nr(p), p->comm, cpu);
 		}
 	}

kernel/sched/deadline.c

@@ -348,12 +348,7 @@ static void replenish_dl_entity(struct sched_dl_entity *dl_se,
 	 * entity.
 	 */
 	if (dl_time_before(dl_se->deadline, rq_clock(rq))) {
-		static bool lag_once = false;
-
-		if (!lag_once) {
-			lag_once = true;
-			printk_sched("sched: DL replenish lagged to much\n");
-		}
+		printk_deferred_once("sched: DL replenish lagged to much\n");
 		dl_se->deadline = rq_clock(rq) + pi_se->dl_deadline;
 		dl_se->runtime = pi_se->dl_runtime;
 	}

kernel/sched/rt.c

@@ -890,14 +890,8 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
 		 * but accrue some time due to boosting.
 		 */
 		if (likely(rt_b->rt_runtime)) {
-			static bool once = false;
-
 			rt_rq->rt_throttled = 1;
-
-			if (!once) {
-				once = true;
-				printk_sched("sched: RT throttling activated\n");
-			}
+			printk_deferred_once("sched: RT throttling activated\n");
 		} else {
 			/*
 			 * In case we did anyway, make it go away,