Commit a53efe5f authored Oct 26, 2012 by Martin Schwidefsky

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: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 56f15e51

kernel/sched/core.c

+3 −1

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

		BUG_ON(cpu_online(smp_processor_id()));

		if (mm != &init_mm)
		if (mm != &init_mm) {
		switch_mm(mm, &init_mm, current);
		finish_arch_post_lock_switch();
		}
		mmdrop(mm);
		}

mm/mmu_context.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,9 @@ void use_mm(struct mm_struct *mm)
		tsk->mm = mm;
		switch_mm(active_mm, mm, tsk);
		task_unlock(tsk);
		#ifdef finish_arch_post_lock_switch
		finish_arch_post_lock_switch();
		#endif

		if (active_mm != mm)
		mmdrop(active_mm);