sched: group scheduler SMP migration fix

group scheduler SMP migration fix: use task_cfs_rq(p) to get
to the relevant fair-scheduling runqueue of a task, rq->cfs
is not the right one.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index ba9fa6c..e1657e0 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1040,6 +1040,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 {
        int old_cpu = task_cpu(p);
        struct rq *old_rq = cpu_rq(old_cpu), *new_rq = cpu_rq(new_cpu);
+       struct cfs_rq *old_cfsrq = task_cfs_rq(p),
+                     *new_cfsrq = cpu_cfs_rq(old_cfsrq, new_cpu);
        u64 clock_offset;
 
        clock_offset = old_rq->clock - new_rq->clock;
@@ -1052,7 +1054,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
        if (p->se.block_start)
                p->se.block_start -= clock_offset;
 #endif
-       p->se.vruntime -= old_rq->cfs.min_vruntime - new_rq->cfs.min_vruntime;
+       p->se.vruntime -= old_cfsrq->min_vruntime -
+                                        new_cfsrq->min_vruntime;
 
        __set_task_cpu(p, new_cpu);
 }