[GIT PULL] scheduler fixes

[Ingo Molnar]

Linus,

Please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
sched-urgent-for-linus

   # HEAD: 193be41e33168a3a06eb9d356d9e39c69de161d2 sched/deadline: Fix 
confusing comments about selection of top pi-waiter

A cputime fix and code comments/organization fix to the deadline scheduler.

 Thanks,

        Ingo

------------------>
Joel Fernandes (1):
      sched/deadline: Fix confusing comments about selection of top pi-waiter

Wanpeng Li (1):
      sched/cputime: Don't use smp_processor_id() in preemptible context


 kernel/sched/cputime.c  |  6 +++---
 kernel/sched/deadline.c | 14 ++++++++------
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 6e3ea4ac1bda..14d2dbf97c53 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -683,7 +683,7 @@ static u64 vtime_delta(struct vtime *vtime)
 {
        unsigned long long clock;
 
-       clock = sched_clock_cpu(smp_processor_id());
+       clock = sched_clock();
        if (clock < vtime->starttime)
                return 0;
 
@@ -814,7 +814,7 @@ void arch_vtime_task_switch(struct task_struct *prev)
 
        write_seqcount_begin(&vtime->seqcount);
        vtime->state = VTIME_SYS;
-       vtime->starttime = sched_clock_cpu(smp_processor_id());
+       vtime->starttime = sched_clock();
        write_seqcount_end(&vtime->seqcount);
 }
 
@@ -826,7 +826,7 @@ void vtime_init_idle(struct task_struct *t, int cpu)
        local_irq_save(flags);
        write_seqcount_begin(&vtime->seqcount);
        vtime->state = VTIME_SYS;
-       vtime->starttime = sched_clock_cpu(cpu);
+       vtime->starttime = sched_clock();
        write_seqcount_end(&vtime->seqcount);
        local_irq_restore(flags);
 }
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index a84299f44b5d..755bd3f1a1a9 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1392,17 +1392,19 @@ static void enqueue_task_dl(struct rq *rq, struct 
task_struct *p, int flags)
        struct sched_dl_entity *pi_se = &p->dl;
 
        /*
-        * Use the scheduling parameters of the top pi-waiter
-        * task if we have one and its (absolute) deadline is
-        * smaller than our one... OTW we keep our runtime and
-        * deadline.
+        * Use the scheduling parameters of the top pi-waiter task if:
+        * - we have a top pi-waiter which is a SCHED_DEADLINE task AND
+        * - our dl_boosted is set (i.e. the pi-waiter's (absolute) deadline is
+        *   smaller than our deadline OR we are a !SCHED_DEADLINE task getting
+        *   boosted due to a SCHED_DEADLINE pi-waiter).
+        * Otherwise we keep our runtime and deadline.
         */
-       if (pi_task && p->dl.dl_boosted && dl_prio(pi_task->normal_prio)) {
+       if (pi_task && dl_prio(pi_task->normal_prio) && p->dl.dl_boosted) {
                pi_se = &pi_task->dl;
        } else if (!dl_prio(p->normal_prio)) {
                /*
                 * Special case in which we have a !SCHED_DEADLINE task
-                * that is going to be deboosted, but exceedes its
+                * that is going to be deboosted, but exceeds its
                 * runtime while doing so. No point in replenishing
                 * it, as it's going to return back to its original
                 * scheduling class after this.