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-rw-r--r--kernel/sched/core.c40
-rw-r--r--kernel/sched/rt.c5
-rw-r--r--kernel/sched/sched.h6
3 files changed, 1 insertions, 50 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c46a011..8b51b2d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1361,25 +1361,6 @@ static void ttwu_queue_remote(struct task_struct *p, int cpu)
smp_send_reschedule(cpu);
}
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
-static int ttwu_activate_remote(struct task_struct *p, int wake_flags)
-{
- struct rq *rq;
- int ret = 0;
-
- rq = __task_rq_lock(p);
- if (p->on_cpu) {
- ttwu_activate(rq, p, ENQUEUE_WAKEUP);
- ttwu_do_wakeup(rq, p, wake_flags);
- ret = 1;
- }
- __task_rq_unlock(rq);
-
- return ret;
-
-}
-#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
-
bool cpus_share_cache(int this_cpu, int that_cpu)
{
return per_cpu(sd_llc_id, this_cpu) == per_cpu(sd_llc_id, that_cpu);
@@ -1440,21 +1421,8 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
* If the owning (remote) cpu is still in the middle of schedule() with
* this task as prev, wait until its done referencing the task.
*/
- while (p->on_cpu) {
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- /*
- * In case the architecture enables interrupts in
- * context_switch(), we cannot busy wait, since that
- * would lead to deadlocks when an interrupt hits and
- * tries to wake up @prev. So bail and do a complete
- * remote wakeup.
- */
- if (ttwu_activate_remote(p, wake_flags))
- goto stat;
-#else
+ while (p->on_cpu)
cpu_relax();
-#endif
- }
/*
* Pairs with the smp_wmb() in finish_lock_switch().
*/
@@ -1798,13 +1766,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
prev_state = prev->state;
account_switch_vtime(prev);
finish_arch_switch(prev);
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- local_irq_disable();
-#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
perf_event_task_sched_in(prev, current);
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- local_irq_enable();
-#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
finish_lock_switch(rq, prev);
finish_arch_post_lock_switch();
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index e0b7ba9..418feb0 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1632,11 +1632,6 @@ static int push_rt_task(struct rq *rq)
if (!next_task)
return 0;
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- if (unlikely(task_running(rq, next_task)))
- return 0;
-#endif
-
retry:
if (unlikely(next_task == rq->curr)) {
WARN_ON(1);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 0987169..7a7db09 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -737,11 +737,7 @@ static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
*/
next->on_cpu = 1;
#endif
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- raw_spin_unlock_irq(&rq->lock);
-#else
raw_spin_unlock(&rq->lock);
-#endif
}
static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
@@ -755,9 +751,7 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
smp_wmb();
prev->on_cpu = 0;
#endif
-#ifndef __ARCH_WANT_INTERRUPTS_ON_CTXSW
local_irq_enable();
-#endif
}
#endif /* __ARCH_WANT_UNLOCKED_CTXSW */