1 files changed, 26 insertions, 30 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 8e2558c2ba67..11dd52780adb 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3448,19 +3448,23 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
  */
 #define MAX_PINNED_INTERVAL     512
 
+/* Working cpumask for load_balance and load_balance_newidle. */
+static DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
+
 /*
  * Check this_cpu to ensure it is balanced within domain. Attempt to move
  * tasks if there is an imbalance.
  */
 static int load_balance(int this_cpu, struct rq *this_rq,
                         struct sched_domain *sd, enum cpu_idle_type idle,
-                        int *balance, struct cpumask *cpus)
+                        int *balance)
 {
         int ld_moved, all_pinned = 0, active_balance = 0, sd_idle = 0;
         struct sched_group *group;
         unsigned long imbalance;
         struct rq *busiest;
         unsigned long flags;
+        struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
 
         cpumask_setall(cpus);
 
@@ -3615,8 +3619,7 @@ out:
  * this_rq is locked.
  */
 static int
-load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
-                        struct cpumask *cpus)
+load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd)
 {
         struct sched_group *group;
         struct rq *busiest = NULL;
@@ -3624,6 +3627,7 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
         int ld_moved = 0;
         int sd_idle = 0;
         int all_pinned = 0;
+        struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
 
         cpumask_setall(cpus);
 
@@ -3764,10 +3768,6 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
         struct sched_domain *sd;
         int pulled_task = 0;
         unsigned long next_balance = jiffies + HZ;
-        cpumask_var_t tmpmask;
-
-        if (!alloc_cpumask_var(&tmpmask, GFP_ATOMIC))
-                return;
 
         for_each_domain(this_cpu, sd) {
                 unsigned long interval;
@@ -3778,7 +3778,7 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
                 if (sd->flags & SD_BALANCE_NEWIDLE)
                         /* If we've pulled tasks over stop searching: */
                         pulled_task = load_balance_newidle(this_cpu, this_rq,
-                                                           sd, tmpmask);
+                                                           sd);
 
                 interval = msecs_to_jiffies(sd->balance_interval);
                 if (time_after(next_balance, sd->last_balance + interval))
@@ -3793,7 +3793,6 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
                  */
                 this_rq->next_balance = next_balance;
         }
-        free_cpumask_var(tmpmask);
 }
 
 /*
@@ -3943,11 +3942,6 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
         unsigned long next_balance = jiffies + 60*HZ;
         int update_next_balance = 0;
         int need_serialize;
-        cpumask_var_t tmp;
-
-        /* Fails alloc?  Rebalancing probably not a priority right now. */
-        if (!alloc_cpumask_var(&tmp, GFP_ATOMIC))
-                return;
 
         for_each_domain(cpu, sd) {
                 if (!(sd->flags & SD_LOAD_BALANCE))
@@ -3972,7 +3966,7 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
                 }
 
                 if (time_after_eq(jiffies, sd->last_balance + interval)) {
-                        if (load_balance(cpu, rq, sd, idle, &balance, tmp)) {
+                        if (load_balance(cpu, rq, sd, idle, &balance)) {
                                 /*
                                  * We've pulled tasks over so either we're no
                                  * longer idle, or one of our SMT siblings is
@@ -4006,8 +4000,6 @@ out:
          */
         if (likely(update_next_balance))
                 rq->next_balance = next_balance;
-
-        free_cpumask_var(tmp);
 }
 
 /*
@@ -5944,12 +5936,7 @@ void sched_show_task(struct task_struct *p)
                 printk(KERN_CONT " %016lx ", thread_saved_pc(p));
 #endif
 #ifdef CONFIG_DEBUG_STACK_USAGE
-        {
-                unsigned long *n = end_of_stack(p);
-                while (!*n)
-                        n++;
-                free = (unsigned long)n - (unsigned long)end_of_stack(p);
-        }
+        free = stack_not_used(p);
 #endif
         printk(KERN_CONT "%5lu %5d %6d\n", free,
                 task_pid_nr(p), task_pid_nr(p->real_parent));
@@ -7254,7 +7241,7 @@ cpu_to_core_group(int cpu, const struct cpumask *cpu_map,
 {
         int group;
 
-        cpumask_and(mask, &per_cpu(cpu_sibling_map, cpu), cpu_map);
+        cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
         group = cpumask_first(mask);
         if (sg)
                 *sg = &per_cpu(sched_group_core, group).sg;
@@ -7283,7 +7270,7 @@ cpu_to_phys_group(int cpu, const struct cpumask *cpu_map,
         cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
         group = cpumask_first(mask);
 #elif defined(CONFIG_SCHED_SMT)
-        cpumask_and(mask, &per_cpu(cpu_sibling_map, cpu), cpu_map);
+        cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
         group = cpumask_first(mask);
 #else
         group = cpu;
@@ -7626,7 +7613,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
                 SD_INIT(sd, SIBLING);
                 set_domain_attribute(sd, attr);
                 cpumask_and(sched_domain_span(sd),
-                            &per_cpu(cpu_sibling_map, i), cpu_map);
+                            topology_thread_cpumask(i), cpu_map);
                 sd->parent = p;
                 p->child = sd;
                 cpu_to_cpu_group(i, cpu_map, &sd->groups, tmpmask);
@@ -7637,7 +7624,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
         /* Set up CPU (sibling) groups */
         for_each_cpu(i, cpu_map) {
                 cpumask_and(this_sibling_map,
-                            &per_cpu(cpu_sibling_map, i), cpu_map);
+                            topology_thread_cpumask(i), cpu_map);
                 if (i != cpumask_first(this_sibling_map))
                         continue;
 
@@ -8309,6 +8296,9 @@ void __init sched_init(void)
 #ifdef CONFIG_USER_SCHED
         alloc_size *= 2;
 #endif
+#ifdef CONFIG_CPUMASK_OFFSTACK
+        alloc_size += num_possible_cpus() * cpumask_size();
+#endif
         /*
          * As sched_init() is called before page_alloc is setup,
          * we use alloc_bootmem().
@@ -8346,6 +8336,12 @@ void __init sched_init(void)
                 ptr += nr_cpu_ids * sizeof(void **);
 #endif /* CONFIG_USER_SCHED */
 #endif /* CONFIG_RT_GROUP_SCHED */
+#ifdef CONFIG_CPUMASK_OFFSTACK
+                for_each_possible_cpu(i) {
+                        per_cpu(load_balance_tmpmask, i) = (void *)ptr;
+                        ptr += cpumask_size();
+                }
+#endif /* CONFIG_CPUMASK_OFFSTACK */
         }
 
 #ifdef CONFIG_SMP
@@ -9490,7 +9486,7 @@ cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
 
 static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
 {
-        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+        u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
         u64 data;
 
 #ifndef CONFIG_64BIT
@@ -9509,7 +9505,7 @@ static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
 
 static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
 {
-        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+        u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
 
 #ifndef CONFIG_64BIT
         /*
@@ -9605,7 +9601,7 @@ static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
         ca = task_ca(tsk);
 
         for (; ca; ca = ca->parent) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+                u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
                 *cpuusage += cputime;
         }
 }