mmc: properly iterate over sg list in debug check

[linux-2.6-omap-h63xx.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index 6acf749d33369545310a94ff0fd52341d821bfd0..21f7da94662e20fb5bd31182d784ca02420495c3 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1867,16 +1867,24 @@ migrate_task(struct task_struct *p, int dest_cpu, struct migration_req *req)
 /*
  * wait_task_inactive - wait for a thread to unschedule.
  *
+ * If @match_state is nonzero, it's the @p->state value just checked and
+ * not expected to change.  If it changes, i.e. @p might have woken up,
+ * then return zero.  When we succeed in waiting for @p to be off its CPU,
+ * we return a positive number (its total switch count).  If a second call
+ * a short while later returns the same number, the caller can be sure that
+ * @p has remained unscheduled the whole time.
+ *
  * The caller must ensure that the task *will* unschedule sometime soon,
  * else this function might spin for a *long* time. This function can't
  * be called with interrupts off, or it may introduce deadlock with
  * smp_call_function() if an IPI is sent by the same process we are
  * waiting to become inactive.
  */
-void wait_task_inactive(struct task_struct *p)
+unsigned long wait_task_inactive(struct task_struct *p, long match_state)
 {
        unsigned long flags;
        int running, on_rq;
+       unsigned long ncsw;
        struct rq *rq;
 
        for (;;) {
@@ -1899,8 +1907,11 @@ void wait_task_inactive(struct task_struct *p)
                 * return false if the runqueue has changed and p
                 * is actually now running somewhere else!
                 */
-               while (task_running(rq, p))
+               while (task_running(rq, p)) {
+                       if (match_state && unlikely(p->state != match_state))
+                               return 0;
                        cpu_relax();
+               }
 
                /*
                 * Ok, time to look more closely! We need the rq
@@ -1910,8 +1921,20 @@ void wait_task_inactive(struct task_struct *p)
                rq = task_rq_lock(p, &flags);
                running = task_running(rq, p);
                on_rq = p->se.on_rq;
+               ncsw = 0;
+               if (!match_state || p->state == match_state) {
+                       ncsw = p->nivcsw + p->nvcsw;
+                       if (unlikely(!ncsw))
+                               ncsw = 1;
+               }
                task_rq_unlock(rq, &flags);
 
+               /*
+                * If it changed from the expected state, bail out now.
+                */
+               if (unlikely(!ncsw))
+                       break;
+
                /*
                 * Was it really running after all now that we
                 * checked with the proper locks actually held?
@@ -1944,6 +1967,8 @@ void wait_task_inactive(struct task_struct *p)
                 */
                break;
        }
+
+       return ncsw;
 }
 
 /***
@@ -4046,6 +4071,8 @@ void account_user_time(struct task_struct *p, cputime_t cputime)
                cpustat->nice = cputime64_add(cpustat->nice, tmp);
        else
                cpustat->user = cputime64_add(cpustat->user, tmp);
+       /* Account for user time used */
+       acct_update_integrals(p);
 }
 
 /*
@@ -6387,7 +6414,7 @@ static struct notifier_block __cpuinitdata migration_notifier = {
        .priority = 10
 };
 
-void __init migration_init(void)
+static int __init migration_init(void)
 {
        void *cpu = (void *)(long)smp_processor_id();
        int err;
@@ -6397,7 +6424,10 @@ void __init migration_init(void)
        BUG_ON(err == NOTIFY_BAD);
        migration_call(&migration_notifier, CPU_ONLINE, cpu);
        register_cpu_notifier(&migration_notifier);
+
+       return err;
 }
+early_initcall(migration_init);
 #endif
 
 #ifdef CONFIG_SMP
@@ -7641,34 +7671,34 @@ static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
 }
 
 #ifdef CONFIG_SCHED_MC
-static ssize_t sched_mc_power_savings_show(struct sys_device *dev,
-                               struct sysdev_attribute *attr, char *page)
+static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
+                                          char *page)
 {
        return sprintf(page, "%u\n", sched_mc_power_savings);
 }
-static ssize_t sched_mc_power_savings_store(struct sys_device *dev,
-                                           struct sysdev_attribute *attr,
+static ssize_t sched_mc_power_savings_store(struct sysdev_class *class,
                                            const char *buf, size_t count)
 {
        return sched_power_savings_store(buf, count, 0);
 }
-static SYSDEV_ATTR(sched_mc_power_savings, 0644, sched_mc_power_savings_show,
-                  sched_mc_power_savings_store);
+static SYSDEV_CLASS_ATTR(sched_mc_power_savings, 0644,
+                        sched_mc_power_savings_show,
+                        sched_mc_power_savings_store);
 #endif
 
 #ifdef CONFIG_SCHED_SMT
-static ssize_t sched_smt_power_savings_show(struct sys_device *dev,
-                               struct sysdev_attribute *attr, char *page)
+static ssize_t sched_smt_power_savings_show(struct sysdev_class *dev,
+                                           char *page)
 {
        return sprintf(page, "%u\n", sched_smt_power_savings);
 }
-static ssize_t sched_smt_power_savings_store(struct sys_device *dev,
-                                            struct sysdev_attribute *attr,
+static ssize_t sched_smt_power_savings_store(struct sysdev_class *dev,
                                             const char *buf, size_t count)
 {
        return sched_power_savings_store(buf, count, 1);
 }
-static SYSDEV_ATTR(sched_smt_power_savings, 0644, sched_smt_power_savings_show,
+static SYSDEV_CLASS_ATTR(sched_smt_power_savings, 0644,
+                  sched_smt_power_savings_show,
                   sched_smt_power_savings_store);
 #endif