sched: fair group: fix overflow(was: fix divide by zero)

[pandora-kernel.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index bfb8ad8..6c1ecbd 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -312,12 +312,15 @@ static DEFINE_SPINLOCK(task_group_lock);
 #endif
 
 /*
- * A weight of 0, 1 or ULONG_MAX can cause arithmetics problems.
+ * A weight of 0 or 1 can cause arithmetics problems.
+ * A weight of a cfs_rq is the sum of weights of which entities
+ * are queued on this cfs_rq, so a weight of a entity should not be
+ * too large, so as the shares value of a task group.
  * (The default weight is 1024 - so there's no practical
  *  limitation from this.)
  */
 #define MIN_SHARES     2
-#define MAX_SHARES     (ULONG_MAX - 1)
+#define MAX_SHARES     (1UL << 18)
 
 static int init_task_group_load = INIT_TASK_GROUP_LOAD;
 #endif
@@ -4159,12 +4162,10 @@ need_resched_nonpreemptible:
        clear_tsk_need_resched(prev);
 
        if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
-               if (unlikely((prev->state & TASK_INTERRUPTIBLE) &&
-                               signal_pending(prev))) {
+               if (unlikely(signal_pending_state(prev->state, prev)))
                        prev->state = TASK_RUNNING;
-               } else {
+               else
                        deactivate_task(rq, prev, 1);
-               }
                switch_count = &prev->nvcsw;
        }