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Commit a53efe5f authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm 



The finish_arch_post_lock_switch is called at the end of the task
switch after all locks have been released. In concept it is paired
with the switch_mm function, but the current code only does the
call in finish_task_switch. Add the call to idle_task_exit and
use_mm. One use case for the additional calls is s390 which will
use finish_arch_post_lock_switch to wait for the completion of
TLB flush operations.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 56f15e51

kernel/sched/core.c

+3 −1
Original line number Original line Diff line number Diff line
@@ -4692,8 +4692,10 @@ void idle_task_exit(void) 




	BUG_ON(cpu_online(smp_processor_id()));

	BUG_ON(cpu_online(smp_processor_id()));





	if (mm != &init_mm)

	if (mm != &init_mm) {

		switch_mm(mm, &init_mm, current);

		switch_mm(mm, &init_mm, current);

		finish_arch_post_lock_switch();

	}

	mmdrop(mm);

	mmdrop(mm);

}

}

mm/mmu_context.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -31,6 +31,9 @@ void use_mm(struct mm_struct *mm) 
	tsk->mm = mm;

	tsk->mm = mm;

	switch_mm(active_mm, mm, tsk);

	switch_mm(active_mm, mm, tsk);

	task_unlock(tsk);

	task_unlock(tsk);

#ifdef finish_arch_post_lock_switch

	finish_arch_post_lock_switch();

#endif





	if (active_mm != mm)

	if (active_mm != mm)

		mmdrop(active_mm);

		mmdrop(active_mm);