Merge branch 'uprobes-v7' of git://git.linaro.org/people/dave.long/linux into devel-stable

This patch series adds basic uprobes support to ARM. It is based on
patches developed earlier by Rabin Vincent. That approach of adding
hooks into the kprobes instruction parsing code was not well received.
This approach separates the ARM instruction parsing code in kprobes out
into a separate set of functions which can be used by both kprobes and
uprobes. Both kprobes and uprobes then provide their own semantic action
tables to process the results of the parsing.

5 files changed, 24 insertions, 23 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b46131ef6aab..6edbef296ece 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1952,7 +1952,7 @@ static int dl_overflow(struct task_struct *p, int policy,
 {
 
         struct dl_bw *dl_b = dl_bw_of(task_cpu(p));
-        u64 period = attr->sched_period;
+        u64 period = attr->sched_period ?: attr->sched_deadline;
         u64 runtime = attr->sched_runtime;
         u64 new_bw = dl_policy(policy) ? to_ratio(period, runtime) : 0;
         int cpus, err = -1;
@@ -3661,13 +3661,14 @@ SYSCALL_DEFINE2(sched_setparam, pid_t, pid, struct sched_param __user *, param)
  * @pid: the pid in question.
  * @uattr: structure containing the extended parameters.
  */
-SYSCALL_DEFINE2(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr)
+SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr,
+                               unsigned int, flags)
 {
         struct sched_attr attr;
         struct task_struct *p;
         int retval;
 
-        if (!uattr || pid < 0)
+        if (!uattr || pid < 0 || flags)
                 return -EINVAL;
 
         if (sched_copy_attr(uattr, &attr))
@@ -3786,7 +3787,7 @@ static int sched_read_attr(struct sched_attr __user *uattr,
                 attr->size = usize;
         }
 
-        ret = copy_to_user(uattr, attr, usize);
+        ret = copy_to_user(uattr, attr, attr->size);
         if (ret)
                 return -EFAULT;
 
@@ -3804,8 +3805,8 @@ err_size:
  * @uattr: structure containing the extended parameters.
  * @size: sizeof(attr) for fwd/bwd comp.
  */
-SYSCALL_DEFINE3(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,
-                unsigned int, size)
+SYSCALL_DEFINE4(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,
+                unsigned int, size, unsigned int, flags)
 {
         struct sched_attr attr = {
                 .size = sizeof(struct sched_attr),
@@ -3814,7 +3815,7 @@ SYSCALL_DEFINE3(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,
         int retval;
 
         if (!uattr || pid < 0 || size > PAGE_SIZE ||
-            size < SCHED_ATTR_SIZE_VER0)
+            size < SCHED_ATTR_SIZE_VER0 || flags)
                 return -EINVAL;
 
         rcu_read_lock();
@@ -7422,6 +7423,7 @@ static int sched_dl_global_constraints(void)
         u64 period = global_rt_period();
         u64 new_bw = to_ratio(period, runtime);
         int cpu, ret = 0;
+        unsigned long flags;
 
         /*
          * Here we want to check the bandwidth not being set to some
@@ -7435,10 +7437,10 @@ static int sched_dl_global_constraints(void)
         for_each_possible_cpu(cpu) {
                 struct dl_bw *dl_b = dl_bw_of(cpu);
 
-                raw_spin_lock(&dl_b->lock);
+                raw_spin_lock_irqsave(&dl_b->lock, flags);
                 if (new_bw < dl_b->total_bw)
                         ret = -EBUSY;
-                raw_spin_unlock(&dl_b->lock);
+                raw_spin_unlock_irqrestore(&dl_b->lock, flags);
 
                 if (ret)
                         break;
@@ -7451,6 +7453,7 @@ static void sched_dl_do_global(void)
 {
         u64 new_bw = -1;
         int cpu;
+        unsigned long flags;
 
         def_dl_bandwidth.dl_period = global_rt_period();
         def_dl_bandwidth.dl_runtime = global_rt_runtime();
@@ -7464,9 +7467,9 @@ static void sched_dl_do_global(void)
         for_each_possible_cpu(cpu) {
                 struct dl_bw *dl_b = dl_bw_of(cpu);
 
-                raw_spin_lock(&dl_b->lock);
+                raw_spin_lock_irqsave(&dl_b->lock, flags);
                 dl_b->bw = new_bw;
-                raw_spin_unlock(&dl_b->lock);
+                raw_spin_unlock_irqrestore(&dl_b->lock, flags);
         }
 }
 
@@ -7475,7 +7478,8 @@ static int sched_rt_global_validate(void)
         if (sysctl_sched_rt_period <= 0)
                 return -EINVAL;
 
-        if (sysctl_sched_rt_runtime > sysctl_sched_rt_period)
+        if ((sysctl_sched_rt_runtime != RUNTIME_INF) &&
+                (sysctl_sched_rt_runtime > sysctl_sched_rt_period))
                 return -EINVAL;
 
         return 0;
diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index 045fc74e3f09..5b8838b56d1c 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -70,7 +70,7 @@ static void cpudl_heapify(struct cpudl *cp, int idx)
 
 static void cpudl_change_key(struct cpudl *cp, int idx, u64 new_dl)
 {
-        WARN_ON(idx > num_present_cpus() || idx == IDX_INVALID);
+        WARN_ON(!cpu_present(idx) || idx == IDX_INVALID);
 
         if (dl_time_before(new_dl, cp->elements[idx].dl)) {
                 cp->elements[idx].dl = new_dl;
@@ -117,7 +117,7 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p,
         }
 
 out:
-        WARN_ON(best_cpu > num_present_cpus() && best_cpu != -1);
+        WARN_ON(!cpu_present(best_cpu) && best_cpu != -1);
 
         return best_cpu;
 }
@@ -137,7 +137,7 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid)
         int old_idx, new_cpu;
         unsigned long flags;
 
-        WARN_ON(cpu > num_present_cpus());
+        WARN_ON(!cpu_present(cpu));
 
         raw_spin_lock_irqsave(&cp->lock, flags);
         old_idx = cp->cpu_to_idx[cpu];
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 0dd5e0971a07..15cbc17fbf84 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -121,7 +121,7 @@ static inline void dl_clear_overload(struct rq *rq)
 
 static void update_dl_migration(struct dl_rq *dl_rq)
 {
-        if (dl_rq->dl_nr_migratory && dl_rq->dl_nr_total > 1) {
+        if (dl_rq->dl_nr_migratory && dl_rq->dl_nr_running > 1) {
                 if (!dl_rq->overloaded) {
                         dl_set_overload(rq_of_dl_rq(dl_rq));
                         dl_rq->overloaded = 1;
@@ -137,7 +137,6 @@ static void inc_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
         struct task_struct *p = dl_task_of(dl_se);
         dl_rq = &rq_of_dl_rq(dl_rq)->dl;
 
-        dl_rq->dl_nr_total++;
         if (p->nr_cpus_allowed > 1)
                 dl_rq->dl_nr_migratory++;
 
@@ -149,7 +148,6 @@ static void dec_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
         struct task_struct *p = dl_task_of(dl_se);
         dl_rq = &rq_of_dl_rq(dl_rq)->dl;
 
-        dl_rq->dl_nr_total--;
         if (p->nr_cpus_allowed > 1)
                 dl_rq->dl_nr_migratory--;
 
@@ -717,6 +715,7 @@ void inc_dl_tasks(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
 
         WARN_ON(!dl_prio(prio));
         dl_rq->dl_nr_running++;
+        inc_nr_running(rq_of_dl_rq(dl_rq));
 
         inc_dl_deadline(dl_rq, deadline);
         inc_dl_migration(dl_se, dl_rq);
@@ -730,6 +729,7 @@ void dec_dl_tasks(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
         WARN_ON(!dl_prio(prio));
         WARN_ON(!dl_rq->dl_nr_running);
         dl_rq->dl_nr_running--;
+        dec_nr_running(rq_of_dl_rq(dl_rq));
 
         dec_dl_deadline(dl_rq, dl_se->deadline);
         dec_dl_migration(dl_se, dl_rq);
@@ -836,8 +836,6 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags)
 
         if (!task_current(rq, p) && p->nr_cpus_allowed > 1)
                 enqueue_pushable_dl_task(rq, p);
-
-        inc_nr_running(rq);
 }
 
 static void __dequeue_task_dl(struct rq *rq, struct task_struct *p, int flags)
@@ -850,8 +848,6 @@ static void dequeue_task_dl(struct rq *rq, struct task_struct *p, int flags)
 {
         update_curr_dl(rq);
         __dequeue_task_dl(rq, p, flags);
-
-        dec_nr_running(rq);
 }
 
 /*
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 966cc2bfcb77..78157099b167 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1757,6 +1757,8 @@ void task_numa_work(struct callback_head *work)
                         start = end;
                         if (pages <= 0)
                                 goto out;
+
+                        cond_resched();
                 } while (end != vma->vm_end);
         }
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c2119fd20f8b..f964add50f38 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -462,7 +462,6 @@ struct dl_rq {
         } earliest_dl;
 
         unsigned long dl_nr_migratory;
-        unsigned long dl_nr_total;
         int overloaded;
 
         /*