Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - fsnotify fix

 - poll() timeout fix

 - a few scripts/ tweaks

 - debugobjects updates

 - the (small) ocfs2 queue

 - Minor fixes to kernel/padata.c

 - Maybe half of the MM queue

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (117 commits)
  mm, page_alloc: restore the original nodemask if the fast path allocation failed
  mm, page_alloc: uninline the bad page part of check_new_page()
  mm, page_alloc: don't duplicate code in free_pcp_prepare
  mm, page_alloc: defer debugging checks of pages allocated from the PCP
  mm, page_alloc: defer debugging checks of freed pages until a PCP drain
  cpuset: use static key better and convert to new API
  mm, page_alloc: inline pageblock lookup in page free fast paths
  mm, page_alloc: remove unnecessary variable from free_pcppages_bulk
  mm, page_alloc: pull out side effects from free_pages_check
  mm, page_alloc: un-inline the bad part of free_pages_check
  mm, page_alloc: check multiple page fields with a single branch
  mm, page_alloc: remove field from alloc_context
  mm, page_alloc: avoid looking up the first zone in a zonelist twice
  mm, page_alloc: shortcut watermark checks for order-0 pages
  mm, page_alloc: reduce cost of fair zone allocation policy retry
  mm, page_alloc: shorten the page allocator fast path
  mm, page_alloc: check once if a zone has isolated pageblocks
  mm, page_alloc: move __GFP_HARDWALL modifications out of the fastpath
  mm, page_alloc: simplify last cpupid reset
  mm, page_alloc: remove unnecessary initialisation from __alloc_pages_nodemask()
  ...

kernel/cpuset.c

@@ -61,7 +61,7 @@
 #include <linux/cgroup.h>
 #include <linux/wait.h>
 
-struct static_key cpusets_enabled_key __read_mostly = STATIC_KEY_INIT_FALSE;
+DEFINE_STATIC_KEY_FALSE(cpusets_enabled_key);
 
 /* See "Frequency meter" comments, below. */
 
@@ -2528,27 +2528,27 @@ static struct cpuset *nearest_hardwall_ancestor(struct cpuset *cs)
  *	GFP_KERNEL   - any node in enclosing hardwalled cpuset ok
  *	GFP_USER     - only nodes in current tasks mems allowed ok.
  */
-int __cpuset_node_allowed(int node, gfp_t gfp_mask)
+bool __cpuset_node_allowed(int node, gfp_t gfp_mask)
 {
 	struct cpuset *cs;		/* current cpuset ancestors */
 	int allowed;			/* is allocation in zone z allowed? */
 	unsigned long flags;
 
 	if (in_interrupt())
-		return 1;
+		return true;
 	if (node_isset(node, current->mems_allowed))
-		return 1;
+		return true;
 	/*
 	 * Allow tasks that have access to memory reserves because they have
 	 * been OOM killed to get memory anywhere.
 	 */
 	if (unlikely(test_thread_flag(TIF_MEMDIE)))
-		return 1;
+		return true;
 	if (gfp_mask & __GFP_HARDWALL)	/* If hardwall request, stop here */
-		return 0;
+		return false;
 
 	if (current->flags & PF_EXITING) /* Let dying task have memory */
-		return 1;
+		return true;
 
 	/* Not hardwall and node outside mems_allowed: scan up cpusets */
 	spin_lock_irqsave(&callback_lock, flags);
@@ -2591,13 +2591,7 @@ int __cpuset_node_allowed(int node, gfp_t gfp_mask)
 
 static int cpuset_spread_node(int *rotor)
 {
-	int node;
-
-	node = next_node(*rotor, current->mems_allowed);
-	if (node == MAX_NUMNODES)
-		node = first_node(current->mems_allowed);
-	*rotor = node;
-	return node;
+	return *rotor = next_node_in(*rotor, current->mems_allowed);
 }
 
 int cpuset_mem_spread_node(void)

kernel/kexec_core.c

@@ -1410,7 +1410,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 	VMCOREINFO_STRUCT_SIZE(list_head);
 	VMCOREINFO_SIZE(nodemask_t);
 	VMCOREINFO_OFFSET(page, flags);
-	VMCOREINFO_OFFSET(page, _count);
+	VMCOREINFO_OFFSET(page, _refcount);
 	VMCOREINFO_OFFSET(page, mapping);
 	VMCOREINFO_OFFSET(page, lru);
 	VMCOREINFO_OFFSET(page, _mapcount);

kernel/padata.c

@@ -606,33 +606,6 @@ out_replace:
 	return 0;
 }
 
-/**
- * padata_set_cpumasks - Set both parallel and serial cpumasks. The first
- *                       one is used by parallel workers and the second one
- *                       by the wokers doing serialization.
- *
- * @pinst: padata instance
- * @pcpumask: the cpumask to use for parallel workers
- * @cbcpumask: the cpumsak to use for serial workers
- */
-int padata_set_cpumasks(struct padata_instance *pinst, cpumask_var_t pcpumask,
-			cpumask_var_t cbcpumask)
-{
-	int err;
-
-	mutex_lock(&pinst->lock);
-	get_online_cpus();
-
-	err = __padata_set_cpumasks(pinst, pcpumask, cbcpumask);
-
-	put_online_cpus();
-	mutex_unlock(&pinst->lock);
-
-	return err;
-
-}
-EXPORT_SYMBOL(padata_set_cpumasks);
-
 /**
  * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value
  *                     equivalent to @cpumask.
@@ -674,6 +647,43 @@ out:
 }
 EXPORT_SYMBOL(padata_set_cpumask);
 
+/**
+ * padata_start - start the parallel processing
+ *
+ * @pinst: padata instance to start
+ */
+int padata_start(struct padata_instance *pinst)
+{
+	int err = 0;
+
+	mutex_lock(&pinst->lock);
+
+	if (pinst->flags & PADATA_INVALID)
+		err = -EINVAL;
+
+	 __padata_start(pinst);
+
+	mutex_unlock(&pinst->lock);
+
+	return err;
+}
+EXPORT_SYMBOL(padata_start);
+
+/**
+ * padata_stop - stop the parallel processing
+ *
+ * @pinst: padata instance to stop
+ */
+void padata_stop(struct padata_instance *pinst)
+{
+	mutex_lock(&pinst->lock);
+	__padata_stop(pinst);
+	mutex_unlock(&pinst->lock);
+}
+EXPORT_SYMBOL(padata_stop);
+
+#ifdef CONFIG_HOTPLUG_CPU
+
 static int __padata_add_cpu(struct padata_instance *pinst, int cpu)
 {
 	struct parallel_data *pd;
@@ -694,42 +704,6 @@ static int __padata_add_cpu(struct padata_instance *pinst, int cpu)
 	return 0;
 }
 
- /**
- * padata_add_cpu - add a cpu to one or both(parallel and serial)
- *                  padata cpumasks.
- *
- * @pinst: padata instance
- * @cpu: cpu to add
- * @mask: bitmask of flags specifying to which cpumask @cpu shuld be added.
- *        The @mask may be any combination of the following flags:
- *          PADATA_CPU_SERIAL   - serial cpumask
- *          PADATA_CPU_PARALLEL - parallel cpumask
- */
-
-int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask)
-{
-	int err;
-
-	if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL)))
-		return -EINVAL;
-
-	mutex_lock(&pinst->lock);
-
-	get_online_cpus();
-	if (mask & PADATA_CPU_SERIAL)
-		cpumask_set_cpu(cpu, pinst->cpumask.cbcpu);
-	if (mask & PADATA_CPU_PARALLEL)
-		cpumask_set_cpu(cpu, pinst->cpumask.pcpu);
-
-	err = __padata_add_cpu(pinst, cpu);
-	put_online_cpus();
-
-	mutex_unlock(&pinst->lock);
-
-	return err;
-}
-EXPORT_SYMBOL(padata_add_cpu);
-
 static int __padata_remove_cpu(struct padata_instance *pinst, int cpu)
 {
 	struct parallel_data *pd = NULL;
@@ -789,43 +763,6 @@ int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask)
 }
 EXPORT_SYMBOL(padata_remove_cpu);
 
-/**
- * padata_start - start the parallel processing
- *
- * @pinst: padata instance to start
- */
-int padata_start(struct padata_instance *pinst)
-{
-	int err = 0;
-
-	mutex_lock(&pinst->lock);
-
-	if (pinst->flags & PADATA_INVALID)
-		err =-EINVAL;
-
-	 __padata_start(pinst);
-
-	mutex_unlock(&pinst->lock);
-
-	return err;
-}
-EXPORT_SYMBOL(padata_start);
-
-/**
- * padata_stop - stop the parallel processing
- *
- * @pinst: padata instance to stop
- */
-void padata_stop(struct padata_instance *pinst)
-{
-	mutex_lock(&pinst->lock);
-	__padata_stop(pinst);
-	mutex_unlock(&pinst->lock);
-}
-EXPORT_SYMBOL(padata_stop);
-
-#ifdef CONFIG_HOTPLUG_CPU
-
 static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu)
 {
 	return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) ||
@@ -1091,7 +1028,6 @@ err_free_inst:
 err:
 	return NULL;
 }
-EXPORT_SYMBOL(padata_alloc);
 
 /**
  * padata_free - free a padata instance

kernel/rcu/update.c

@@ -380,29 +380,9 @@ void destroy_rcu_head(struct rcu_head *head)
 	debug_object_free(head, &rcuhead_debug_descr);
 }
 
-/*
- * fixup_activate is called when:
- * - an active object is activated
- * - an unknown object is activated (might be a statically initialized object)
- * Activation is performed internally by call_rcu().
- */
-static int rcuhead_fixup_activate(void *addr, enum debug_obj_state state)
+static bool rcuhead_is_static_object(void *addr)
 {
-	struct rcu_head *head = addr;
-
-	switch (state) {
-
-	case ODEBUG_STATE_NOTAVAILABLE:
-		/*
-		 * This is not really a fixup. We just make sure that it is
-		 * tracked in the object tracker.
-		 */
-		debug_object_init(head, &rcuhead_debug_descr);
-		debug_object_activate(head, &rcuhead_debug_descr);
-		return 0;
-	default:
-		return 1;
-	}
+	return true;
 }
 
 /**
@@ -440,7 +420,7 @@ EXPORT_SYMBOL_GPL(destroy_rcu_head_on_stack);
 
 struct debug_obj_descr rcuhead_debug_descr = {
 	.name = "rcu_head",
-	.fixup_activate = rcuhead_fixup_activate,
+	.is_static_object = rcuhead_is_static_object,
 };
 EXPORT_SYMBOL_GPL(rcuhead_debug_descr);
 #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */

kernel/sysctl.c

@@ -1521,6 +1521,13 @@ static struct ctl_table vm_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
+	{
+		.procname	= "stat_refresh",
+		.data		= NULL,
+		.maxlen		= 0,
+		.mode		= 0600,
+		.proc_handler	= vmstat_refresh,
+	},
 #endif
 #ifdef CONFIG_MMU
 	{

kernel/time/hrtimer.c

@@ -334,7 +334,7 @@ static void *hrtimer_debug_hint(void *addr)
  * fixup_init is called when:
  * - an active object is initialized
  */
-static int hrtimer_fixup_init(void *addr, enum debug_obj_state state)
+static bool hrtimer_fixup_init(void *addr, enum debug_obj_state state)
 {
 	struct hrtimer *timer = addr;
 
@@ -342,30 +342,25 @@ static int hrtimer_fixup_init(void *addr, enum debug_obj_state state)
 	case ODEBUG_STATE_ACTIVE:
 		hrtimer_cancel(timer);
 		debug_object_init(timer, &hrtimer_debug_descr);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
 /*
  * fixup_activate is called when:
  * - an active object is activated
- * - an unknown object is activated (might be a statically initialized object)
+ * - an unknown non-static object is activated
  */
-static int hrtimer_fixup_activate(void *addr, enum debug_obj_state state)
+static bool hrtimer_fixup_activate(void *addr, enum debug_obj_state state)
 {
 	switch (state) {
-
-	case ODEBUG_STATE_NOTAVAILABLE:
-		WARN_ON_ONCE(1);
-		return 0;
-
 	case ODEBUG_STATE_ACTIVE:
 		WARN_ON(1);
 
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -373,7 +368,7 @@ static int hrtimer_fixup_activate(void *addr, enum debug_obj_state state)
  * fixup_free is called when:
  * - an active object is freed
  */
-static int hrtimer_fixup_free(void *addr, enum debug_obj_state state)
+static bool hrtimer_fixup_free(void *addr, enum debug_obj_state state)
 {
 	struct hrtimer *timer = addr;
 
@@ -381,9 +376,9 @@ static int hrtimer_fixup_free(void *addr, enum debug_obj_state state)
 	case ODEBUG_STATE_ACTIVE:
 		hrtimer_cancel(timer);
 		debug_object_free(timer, &hrtimer_debug_descr);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 

kernel/time/time.c

@@ -769,3 +769,24 @@ struct timespec timespec_add_safe(const struct timespec lhs,
 
 	return res;
 }
+
+/*
+ * Add two timespec64 values and do a safety check for overflow.
+ * It's assumed that both values are valid (>= 0).
+ * And, each timespec64 is in normalized form.
+ */
+struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
+				const struct timespec64 rhs)
+{
+	struct timespec64 res;
+
+	set_normalized_timespec64(&res, lhs.tv_sec + rhs.tv_sec,
+			lhs.tv_nsec + rhs.tv_nsec);
+
+	if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) {
+		res.tv_sec = TIME64_MAX;
+		res.tv_nsec = 0;
+	}
+
+	return res;
+}

kernel/time/timer.c

@@ -489,11 +489,19 @@ static void *timer_debug_hint(void *addr)
 	return ((struct timer_list *) addr)->function;
 }
 
+static bool timer_is_static_object(void *addr)
+{
+	struct timer_list *timer = addr;
+
+	return (timer->entry.pprev == NULL &&
+		timer->entry.next == TIMER_ENTRY_STATIC);
+}
+
 /*
  * fixup_init is called when:
  * - an active object is initialized
  */
-static int timer_fixup_init(void *addr, enum debug_obj_state state)
+static bool timer_fixup_init(void *addr, enum debug_obj_state state)
 {
 	struct timer_list *timer = addr;
 
@@ -501,9 +509,9 @@ static int timer_fixup_init(void *addr, enum debug_obj_state state)
 	case ODEBUG_STATE_ACTIVE:
 		del_timer_sync(timer);
 		debug_object_init(timer, &timer_debug_descr);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -516,36 +524,22 @@ static void stub_timer(unsigned long data)
 /*
  * fixup_activate is called when:
  * - an active object is activated
- * - an unknown object is activated (might be a statically initialized object)
+ * - an unknown non-static object is activated
  */
-static int timer_fixup_activate(void *addr, enum debug_obj_state state)
+static bool timer_fixup_activate(void *addr, enum debug_obj_state state)
 {
 	struct timer_list *timer = addr;
 
 	switch (state) {
-
 	case ODEBUG_STATE_NOTAVAILABLE:
-		/*
-		 * This is not really a fixup. The timer was
-		 * statically initialized. We just make sure that it
-		 * is tracked in the object tracker.
-		 */
-		if (timer->entry.pprev == NULL &&
-		    timer->entry.next == TIMER_ENTRY_STATIC) {
-			debug_object_init(timer, &timer_debug_descr);
-			debug_object_activate(timer, &timer_debug_descr);
-			return 0;
-		} else {
-			setup_timer(timer, stub_timer, 0);
-			return 1;
-		}
-		return 0;
+		setup_timer(timer, stub_timer, 0);
+		return true;
 
 	case ODEBUG_STATE_ACTIVE:
 		WARN_ON(1);
 
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -553,7 +547,7 @@ static int timer_fixup_activate(void *addr, enum debug_obj_state state)
  * fixup_free is called when:
  * - an active object is freed
  */
-static int timer_fixup_free(void *addr, enum debug_obj_state state)
+static bool timer_fixup_free(void *addr, enum debug_obj_state state)
 {
 	struct timer_list *timer = addr;
 
@@ -561,9 +555,9 @@ static int timer_fixup_free(void *addr, enum debug_obj_state state)
 	case ODEBUG_STATE_ACTIVE:
 		del_timer_sync(timer);
 		debug_object_free(timer, &timer_debug_descr);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -571,32 +565,23 @@ static int timer_fixup_free(void *addr, enum debug_obj_state state)
  * fixup_assert_init is called when:
  * - an untracked/uninit-ed object is found
  */
-static int timer_fixup_assert_init(void *addr, enum debug_obj_state state)
+static bool timer_fixup_assert_init(void *addr, enum debug_obj_state state)
 {
 	struct timer_list *timer = addr;
 
 	switch (state) {
 	case ODEBUG_STATE_NOTAVAILABLE:
-		if (timer->entry.next == TIMER_ENTRY_STATIC) {
-			/*
-			 * This is not really a fixup. The timer was
-			 * statically initialized. We just make sure that it
-			 * is tracked in the object tracker.
-			 */
-			debug_object_init(timer, &timer_debug_descr);
-			return 0;
-		} else {
-			setup_timer(timer, stub_timer, 0);
-			return 1;
-		}
+		setup_timer(timer, stub_timer, 0);
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
 static struct debug_obj_descr timer_debug_descr = {
 	.name			= "timer_list",
 	.debug_hint		= timer_debug_hint,
+	.is_static_object	= timer_is_static_object,
 	.fixup_init		= timer_fixup_init,
 	.fixup_activate		= timer_fixup_activate,
 	.fixup_free		= timer_fixup_free,

kernel/workqueue.c

@@ -433,11 +433,18 @@ static void *work_debug_hint(void *addr)
 	return ((struct work_struct *) addr)->func;
 }
 
+static bool work_is_static_object(void *addr)
+{
+	struct work_struct *work = addr;
+
+	return test_bit(WORK_STRUCT_STATIC_BIT, work_data_bits(work));
+}
+
 /*
  * fixup_init is called when:
  * - an active object is initialized
  */
-static int work_fixup_init(void *addr, enum debug_obj_state state)
+static bool work_fixup_init(void *addr, enum debug_obj_state state)
 {
 	struct work_struct *work = addr;
 
@@ -445,42 +452,9 @@ static int work_fixup_init(void *addr, enum debug_obj_state state)
 	case ODEBUG_STATE_ACTIVE:
 		cancel_work_sync(work);
 		debug_object_init(work, &work_debug_descr);
-		return 1;
+		return true;
 	default:
-		return 0;
-	}
-}
-
-/*
- * fixup_activate is called when:
- * - an active object is activated
- * - an unknown object is activated (might be a statically initialized object)
- */
-static int work_fixup_activate(void *addr, enum debug_obj_state state)
-{
-	struct work_struct *work = addr;
-
-	switch (state) {
-
-	case ODEBUG_STATE_NOTAVAILABLE:
-		/*
-		 * This is not really a fixup. The work struct was
-		 * statically initialized. We just make sure that it
-		 * is tracked in the object tracker.
-		 */
-		if (test_bit(WORK_STRUCT_STATIC_BIT, work_data_bits(work))) {
-			debug_object_init(work, &work_debug_descr);
-			debug_object_activate(work, &work_debug_descr);
-			return 0;
-		}
-		WARN_ON_ONCE(1);
-		return 0;
-
-	case ODEBUG_STATE_ACTIVE:
-		WARN_ON(1);
-
-	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -488,7 +462,7 @@ static int work_fixup_activate(void *addr, enum debug_obj_state state)
  * fixup_free is called when:
  * - an active object is freed
  */
-static int work_fixup_free(void *addr, enum debug_obj_state state)
+static bool work_fixup_free(void *addr, enum debug_obj_state state)
 {
 	struct work_struct *work = addr;
 
@@ -496,17 +470,17 @@ static int work_fixup_free(void *addr, enum debug_obj_state state)
 	case ODEBUG_STATE_ACTIVE:
 		cancel_work_sync(work);
 		debug_object_free(work, &work_debug_descr);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
 static struct debug_obj_descr work_debug_descr = {
 	.name		= "work_struct",
 	.debug_hint	= work_debug_hint,
+	.is_static_object = work_is_static_object,
 	.fixup_init	= work_fixup_init,
-	.fixup_activate	= work_fixup_activate,
 	.fixup_free	= work_fixup_free,
 };