finish_task_switch

Name:sh_task_switch - clean up after a task-switch*@prev: the thread we just switched away from

Proto:static struct rq *finish_task_switch(struct task_struct *prev)__releases(rq->lock)

Type:struct rq

Parameter:

Type	Parameter	Name
struct task_struct *	prev

3188

rq = this_rq()

3189

3203

If WARN_ONCE(We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users* that think a non-zero value indicates we cannot preempt. != 2 * PREEMPT_DISABLE_OFFSET, "corrupted preempt_count: %s/%d/0x%x\n", comm, pid, We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users* that think a non-zero value indicates we cannot preempt.) Then preempt_count_set(Initial preempt_count value; reflects the preempt_count schedule invariant* which states that during context switches:* preempt_count() == 2*PREEMPT_DISABLE_OFFSET* Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels.)

3208

prev_mm = NULL

3221

prev_state = run state

3222

vtime_task_switch(prev)

3223

perf_event_task_sched_in(prev, current process)

3224

finish_task(prev)

3225

finish_lock_switch(rq)

3226

finish_arch_post_lock_switch()

3227

kcov_finish_switch(current process)

3229

fire_sched_in_preempt_notifiers(current process)

3242

If mm Then

3243

membarrier_mm_sync_core_before_usermode(mm)

3244

3246

If Value for the false possibility is greater at compile time(prev_state == TASK_DEAD) Then

3247

If task_dead Then task_dead(prev)

3254

kprobe_flush_task(prev)

3257

put_task_stack(prev)

3259

put_task_struct_rcu_user(prev)

3262

tick_nohz_task_switch()

3263

Return rq

**Caller**
Name	Describe
schedule_tail	schedule_tail - first thing a freshly forked thread must call.*@prev: the thread we just switched away from.
context_switch	ext_switch - switch to the new MM and the new thread's register state.

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