From a53efe5ff88d0283bae8a2c2fa066d0fff31dc91 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 26 Oct 2012 17:17:44 +0200 Subject: [PATCH] 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 --- kernel/sched/core.c | 4 +++- mm/mmu_context.c | 3 +++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index b46131ef6aab..4b0739c9558e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -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); } diff --git a/mm/mmu_context.c b/mm/mmu_context.c index 8a8cd0265e52..f802c2d216a7 100644 --- a/mm/mmu_context.c +++ b/mm/mmu_context.c @@ -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);