Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: prevent divide by zero error in cpu_avg_load_per_task, update
  sched, cpusets: fix warning in kernel/cpuset.c
  sched: prevent divide by zero error in cpu_avg_load_per_task

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index da7ff6137f375d44d7bf33dc8e10bd0e1751f89f..96c0ba13b8cd06add25de5043547b62cef6ef7b5 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -585,7 +585,7 @@ static int generate_sched_domains(cpumask_t **domains,
        int i, j, k;            /* indices for partition finding loops */
        cpumask_t *doms;        /* resulting partition; i.e. sched domains */
        struct sched_domain_attr *dattr;  /* attributes for custom domains */
-       int ndoms;              /* number of sched domains in result */
+       int ndoms = 0;          /* number of sched domains in result */
        int nslot;              /* next empty doms[] cpumask_t slot */
 
        doms = NULL;

diff --git a/kernel/sched.c b/kernel/sched.c
index 9b1e79371c207b37c1617d3f7c0460709a3cc39b..b7480fb5c3dc21a7bf6513a978cf0ed2e8c19a8f 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1453,9 +1453,10 @@ static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
 static unsigned long cpu_avg_load_per_task(int cpu)
 {
        struct rq *rq = cpu_rq(cpu);
+       unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
 
-       if (rq->nr_running)
-               rq->avg_load_per_task = rq->load.weight / rq->nr_running;
+       if (nr_running)
+               rq->avg_load_per_task = rq->load.weight / nr_running;
        else
                rq->avg_load_per_task = 0;