From e05ef9bdb899e2f3798be74691842fc597d8ce60 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Mon, 25 Oct 2010 16:10:45 +0200 Subject: [PATCH] [S390] kvm: Fix badness at include/asm/mmu_context.h:83 commit 050eef364ad700590a605a0749f825cab4834b1e [S390] fix tlb flushing vs. concurrent /proc accesses broke KVM on s390x. On every schedule a Badness at include/asm/mmu_context.h:83 appears. s390_enable_sie replaces the mm on the __running__ task, therefore, we have to increase the attach count of the new mm. Signed-off-by: Christian Borntraeger Signed-off-by: Martin Schwidefsky --- arch/s390/mm/pgtable.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 19338d228c9b..0c719c61972e 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -449,6 +449,8 @@ int s390_enable_sie(void) tsk->mm = tsk->active_mm = mm; preempt_disable(); update_mm(mm, tsk); + atomic_inc(&mm->context.attach_count); + atomic_dec(&old_mm->context.attach_count); cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); preempt_enable(); task_unlock(tsk); -- 2.20.1