Merge branch 'linus' into sched/core

Merge reason: Move from the -rc3 to the almost-rc6 base.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

13 files changed, 87 insertions, 59 deletions

diff --git a/kernel/early_res.c b/kernel/early_res.c
index 31aa9332ef3f..7bfae887f211 100644
--- a/kernel/early_res.c
+++ b/kernel/early_res.c
@@ -7,6 +7,8 @@
 #include <linux/bootmem.h>
 #include <linux/mm.h>
 #include <linux/early_res.h>
+#include <linux/slab.h>
+#include <linux/kmemleak.h>
 
 /*
  * Early reserved memory areas.
@@ -319,6 +321,8 @@ void __init free_early(u64 start, u64 end)
         struct early_res *r;
         int i;
 
+        kmemleak_free_part(__va(start), end - start);
+
         i = find_overlapped_early(start, end);
         r = &early_res[i];
         if (i >= max_early_res || r->end != end || r->start != start)
@@ -333,6 +337,8 @@ void __init free_early_partial(u64 start, u64 end)
         struct early_res *r;
         int i;
 
+        kmemleak_free_part(__va(start), end - start);
+
         if (start == end)
                 return;
 
diff --git a/kernel/futex.c b/kernel/futex.c
index e7a35f1039e7..6a3a5fa1526d 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -429,20 +429,11 @@ static void free_pi_state(struct futex_pi_state *pi_state)
 static struct task_struct * futex_find_get_task(pid_t pid)
 {
         struct task_struct *p;
-        const struct cred *cred = current_cred(), *pcred;
 
         rcu_read_lock();
         p = find_task_by_vpid(pid);
-        if (!p) {
-                p = ERR_PTR(-ESRCH);
-        } else {
-                pcred = __task_cred(p);
-                if (cred->euid != pcred->euid &&
-                    cred->euid != pcred->uid)
-                        p = ERR_PTR(-ESRCH);
-                else
-                        get_task_struct(p);
-        }
+        if (p)
+                get_task_struct(p);
 
         rcu_read_unlock();
 
@@ -564,8 +555,8 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
         if (!pid)
                 return -ESRCH;
         p = futex_find_get_task(pid);
-        if (IS_ERR(p))
-                return PTR_ERR(p);
+        if (!p)
+                return -ESRCH;
 
         /*
          * We need to look at the task state flags to figure out,
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 3164ba7ce151..e1497481fe8a 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -456,6 +456,9 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
                 /* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
                 desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
                 desc->status |= flags;
+
+                if (chip != desc->chip)
+                        irq_chip_set_defaults(desc->chip);
         }
 
         return ret;
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 474a84715eac..131b1703936f 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1089,9 +1089,10 @@ void crash_kexec(struct pt_regs *regs)
 
 size_t crash_get_memory_size(void)
 {
-        size_t size;
+        size_t size = 0;
         mutex_lock(&kexec_mutex);
-        size = crashk_res.end - crashk_res.start + 1;
+        if (crashk_res.end != crashk_res.start)
+                size = crashk_res.end - crashk_res.start + 1;
         mutex_unlock(&kexec_mutex);
         return size;
 }
@@ -1134,7 +1135,7 @@ int crash_shrink_memory(unsigned long new_size)
 
         free_reserved_phys_range(end, crashk_res.end);
 
-        if (start == end)
+        if ((start == end) && (crashk_res.parent != NULL))
                 release_resource(&crashk_res);
         crashk_res.end = end - 1;
 
diff --git a/kernel/module.c b/kernel/module.c
index 8c6b42840dd1..5d2d28197c82 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2062,6 +2062,12 @@ static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
 #endif
 }
 
+static void dynamic_debug_remove(struct _ddebug *debug)
+{
+        if (debug)
+                ddebug_remove_module(debug->modname);
+}
+
 static void *module_alloc_update_bounds(unsigned long size)
 {
         void *ret = module_alloc(size);
@@ -2124,6 +2130,8 @@ static noinline struct module *load_module(void __user *umod,
         void *ptr = NULL; /* Stops spurious gcc warning */
         unsigned long symoffs, stroffs, *strmap;
         void __percpu *percpu;
+        struct _ddebug *debug = NULL;
+        unsigned int num_debug = 0;
 
         mm_segment_t old_fs;
 
@@ -2476,15 +2484,9 @@ static noinline struct module *load_module(void __user *umod,
         kfree(strmap);
         strmap = NULL;
 
-        if (!mod->taints) {
-                struct _ddebug *debug;
-                unsigned int num_debug;
-
+        if (!mod->taints)
                 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
                                      sizeof(*debug), &num_debug);
-                if (debug)
-                        dynamic_debug_setup(debug, num_debug);
-        }
 
         err = module_finalize(hdr, sechdrs, mod);
         if (err < 0)
@@ -2526,10 +2528,13 @@ static noinline struct module *load_module(void __user *umod,
                 goto unlock;
         }
 
+        if (debug)
+                dynamic_debug_setup(debug, num_debug);
+
         /* Find duplicate symbols */
         err = verify_export_symbols(mod);
         if (err < 0)
-                goto unlock;
+                goto ddebug;
 
         list_add_rcu(&mod->list, &modules);
         mutex_unlock(&module_mutex);
@@ -2557,6 +2562,8 @@ static noinline struct module *load_module(void __user *umod,
         mutex_lock(&module_mutex);
         /* Unlink carefully: kallsyms could be walking list. */
         list_del_rcu(&mod->list);
+ ddebug:
+        dynamic_debug_remove(debug);
  unlock:
         mutex_unlock(&module_mutex);
         synchronize_sched();
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 5c36ea9d55d2..ca6066a6952e 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -99,9 +99,13 @@ config PM_SLEEP_ADVANCED_DEBUG
         depends on PM_ADVANCED_DEBUG
         default n
 
+config SUSPEND_NVS
+       bool
+
 config SUSPEND
         bool "Suspend to RAM and standby"
         depends on PM && ARCH_SUSPEND_POSSIBLE
+        select SUSPEND_NVS if HAS_IOMEM
         default y
         ---help---
           Allow the system to enter sleep states in which main memory is
@@ -130,13 +134,10 @@ config SUSPEND_FREEZER
 
           Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
-config HIBERNATION_NVS
-        bool
-
 config HIBERNATION
         bool "Hibernation (aka 'suspend to disk')"
         depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
-        select HIBERNATION_NVS if HAS_IOMEM
+        select SUSPEND_NVS if HAS_IOMEM
         ---help---
           Enable the suspend to disk (STD) functionality, which is usually
           called "hibernation" in user interfaces.  STD checkpoints the
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 524e058dcf06..f9063c6b185d 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -10,6 +10,6 @@ obj-$(CONFIG_SUSPEND)		+= suspend.o
 obj-$(CONFIG_PM_TEST_SUSPEND)   += suspend_test.o
 obj-$(CONFIG_HIBERNATION)       += hibernate.o snapshot.o swap.o user.o \
                                    block_io.o
-obj-$(CONFIG_HIBERNATION_NVS)   += hibernate_nvs.o
+obj-$(CONFIG_SUSPEND_NVS)       += nvs.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)       += poweroff.o
diff --git a/kernel/power/hibernate_nvs.c b/kernel/power/nvs.c
index fdcad9ed5a7b..1836db60bbb6 100644
--- a/kernel/power/hibernate_nvs.c
+++ b/kernel/power/nvs.c
@@ -15,7 +15,7 @@
 
 /*
  * Platforms, like ACPI, may want us to save some memory used by them during
- * hibernation and to restore the contents of this memory during the subsequent
+ * suspend and to restore the contents of this memory during the subsequent
  * resume.  The code below implements a mechanism allowing us to do that.
  */
 
@@ -30,7 +30,7 @@ struct nvs_page {
 static LIST_HEAD(nvs_list);
 
 /**
- *      hibernate_nvs_register - register platform NVS memory region to save
+ *      suspend_nvs_register - register platform NVS memory region to save
  *      @start - physical address of the region
  *      @size - size of the region
  *
@@ -38,7 +38,7 @@ static LIST_HEAD(nvs_list);
  *      things so that the data from page-aligned addresses in this region will
  *      be copied into separate RAM pages.
  */
-int hibernate_nvs_register(unsigned long start, unsigned long size)
+int suspend_nvs_register(unsigned long start, unsigned long size)
 {
         struct nvs_page *entry, *next;
 
@@ -68,9 +68,9 @@ int hibernate_nvs_register(unsigned long start, unsigned long size)
 }
 
 /**
- *      hibernate_nvs_free - free data pages allocated for saving NVS regions
+ *      suspend_nvs_free - free data pages allocated for saving NVS regions
  */
-void hibernate_nvs_free(void)
+void suspend_nvs_free(void)
 {
         struct nvs_page *entry;
 
@@ -86,16 +86,16 @@ void hibernate_nvs_free(void)
 }
 
 /**
- *      hibernate_nvs_alloc - allocate memory necessary for saving NVS regions
+ *      suspend_nvs_alloc - allocate memory necessary for saving NVS regions
  */
-int hibernate_nvs_alloc(void)
+int suspend_nvs_alloc(void)
 {
         struct nvs_page *entry;
 
         list_for_each_entry(entry, &nvs_list, node) {
                 entry->data = (void *)__get_free_page(GFP_KERNEL);
                 if (!entry->data) {
-                        hibernate_nvs_free();
+                        suspend_nvs_free();
                         return -ENOMEM;
                 }
         }
@@ -103,9 +103,9 @@ int hibernate_nvs_alloc(void)
 }
 
 /**
- *      hibernate_nvs_save - save NVS memory regions
+ *      suspend_nvs_save - save NVS memory regions
  */
-void hibernate_nvs_save(void)
+void suspend_nvs_save(void)
 {
         struct nvs_page *entry;
 
@@ -119,12 +119,12 @@ void hibernate_nvs_save(void)
 }
 
 /**
- *      hibernate_nvs_restore - restore NVS memory regions
+ *      suspend_nvs_restore - restore NVS memory regions
  *
  *      This function is going to be called with interrupts disabled, so it
  *      cannot iounmap the virtual addresses used to access the NVS region.
  */
-void hibernate_nvs_restore(void)
+void suspend_nvs_restore(void)
 {
         struct nvs_page *entry;
 
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 56e7dbb8b996..f37cb7dd4402 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -16,6 +16,12 @@
 #include <linux/cpu.h>
 #include <linux/syscalls.h>
 #include <linux/gfp.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
 
 #include "power.h"
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 7b443ee27be4..16f3f77f71be 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1277,6 +1277,12 @@ static void sched_avg_update(struct rq *rq)
         s64 period = sched_avg_period();
 
         while ((s64)(rq->clock - rq->age_stamp) > period) {
+                /*
+                 * Inline assembly required to prevent the compiler
+                 * optimising this loop into a divmod call.
+                 * See __iter_div_u64_rem() for another example of this.
+                 */
+                asm("" : "+rm" (rq->age_stamp));
                 rq->age_stamp += period;
                 rq->rt_avg /= 2;
         }
@@ -1680,9 +1686,6 @@ static void update_shares(struct sched_domain *sd)
 
 static void update_h_load(long cpu)
 {
-        if (root_task_group_empty())
-                return;
-
         walk_tg_tree(tg_load_down, tg_nop, (void *)cpu);
 }
 
@@ -2564,7 +2567,16 @@ void sched_fork(struct task_struct *p, int clone_flags)
         if (p->sched_class->task_fork)
                 p->sched_class->task_fork(p);
 
+        /*
+         * The child is not yet in the pid-hash so no cgroup attach races,
+         * and the cgroup is pinned to this child due to cgroup_fork()
+         * is ran before sched_fork().
+         *
+         * Silence PROVE_RCU.
+         */
+        rcu_read_lock();
         set_task_cpu(p, cpu);
+        rcu_read_unlock();
 
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
         if (likely(sched_info_on()))
@@ -2934,9 +2946,9 @@ unsigned long nr_iowait(void)
         return sum;
 }
 
-unsigned long nr_iowait_cpu(void)
+unsigned long nr_iowait_cpu(int cpu)
 {
-        struct rq *this = this_rq();
+        struct rq *this = cpu_rq(cpu);
         return atomic_read(&this->nr_iowait);
 }
 
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index c9ac09760953..806d1b227a21 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1240,6 +1240,7 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
          * effect of the currently running task from the load
          * of the current CPU:
          */
+        rcu_read_lock();
         if (sync) {
                 tg = task_group(current);
                 weight = current->se.load.weight;
@@ -1275,6 +1276,7 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
                 balanced = this_eff_load <= prev_eff_load;
         } else
                 balanced = true;
+        rcu_read_unlock();
 
         /*
          * If the currently running task will sleep within
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 5f171f04ab00..17525cac6cfe 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -154,14 +154,14 @@ static void tick_nohz_update_jiffies(ktime_t now)
  * Updates the per cpu time idle statistics counters
  */
 static void
-update_ts_time_stats(struct tick_sched *ts, ktime_t now, u64 *last_update_time)
+update_ts_time_stats(int cpu, struct tick_sched *ts, ktime_t now, u64 *last_update_time)
 {
         ktime_t delta;
 
         if (ts->idle_active) {
                 delta = ktime_sub(now, ts->idle_entrytime);
                 ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
-                if (nr_iowait_cpu() > 0)
+                if (nr_iowait_cpu(cpu) > 0)
                         ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta);
                 ts->idle_entrytime = now;
         }
@@ -175,19 +175,19 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)
 {
         struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
 
-        update_ts_time_stats(ts, now, NULL);
+        update_ts_time_stats(cpu, ts, now, NULL);
         ts->idle_active = 0;
 
         sched_clock_idle_wakeup_event(0);
 }
 
-static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
+static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)
 {
         ktime_t now;
 
         now = ktime_get();
 
-        update_ts_time_stats(ts, now, NULL);
+        update_ts_time_stats(cpu, ts, now, NULL);
 
         ts->idle_entrytime = now;
         ts->idle_active = 1;
@@ -216,7 +216,7 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
         if (!tick_nohz_enabled)
                 return -1;
 
-        update_ts_time_stats(ts, ktime_get(), last_update_time);
+        update_ts_time_stats(cpu, ts, ktime_get(), last_update_time);
 
         return ktime_to_us(ts->idle_sleeptime);
 }
@@ -242,7 +242,7 @@ u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time)
         if (!tick_nohz_enabled)
                 return -1;
 
-        update_ts_time_stats(ts, ktime_get(), last_update_time);
+        update_ts_time_stats(cpu, ts, ktime_get(), last_update_time);
 
         return ktime_to_us(ts->iowait_sleeptime);
 }
@@ -284,7 +284,7 @@ void tick_nohz_stop_sched_tick(int inidle)
          */
         ts->inidle = 1;
 
-        now = tick_nohz_start_idle(ts);
+        now = tick_nohz_start_idle(cpu, ts);
 
         /*
          * If this cpu is offline and it is the one which updates
@@ -315,9 +315,6 @@ void tick_nohz_stop_sched_tick(int inidle)
                 goto end;
         }
 
-        if (nohz_ratelimit(cpu))
-                goto end;
-
         ts->idle_calls++;
         /* Read jiffies and the time when jiffies were updated last */
         do {
@@ -328,7 +325,7 @@ void tick_nohz_stop_sched_tick(int inidle)
         } while (read_seqretry(&xtime_lock, seq));
 
         if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu) ||
-            arch_needs_cpu(cpu)) {
+            arch_needs_cpu(cpu) || nohz_ratelimit(cpu)) {
                 next_jiffies = last_jiffies + 1;
                 delta_jiffies = 1;
         } else {
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index e6f65887842c..8a2b73f7c068 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -96,7 +96,9 @@ int perf_trace_init(struct perf_event *p_event)
         mutex_lock(&event_mutex);
         list_for_each_entry(tp_event, &ftrace_events, list) {
                 if (tp_event->event.type == event_id &&
-                    tp_event->class && tp_event->class->perf_probe &&
+                    tp_event->class &&
+                    (tp_event->class->perf_probe ||
+                     tp_event->class->reg) &&
                     try_module_get(tp_event->mod)) {
                         ret = perf_trace_event_init(tp_event, p_event);
                         break;