[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 <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

[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 <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Christian Borntraeger · Martin Schwidefsky
1 parent 376ae4752e
Showing 1 changed file with 2 additions and 0 deletions Side-by-side Diff
arch/s390/mm/pgtable.c
@@ -449,6 +449,8 @@
 	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);
...	...	@@ -449,6 +449,8 @@
449	449	tsk->mm = tsk->active_mm = mm;
450	450	preempt_disable();
451	451	update_mm(mm, tsk);
	452	+ atomic_inc(&mm->context.attach_count);
	453	+ atomic_dec(&old_mm->context.attach_count);
452	454	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
453	455	preempt_enable();
454	456	task_unlock(tsk);