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KVM: async_pf: kill the unnecessary use_mm/unuse_mm async_pf_execute()

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async_pf_execute() has no reasons to adopt apf->mm, gup(current, mm)
should work just fine even if current has another or NULL ->mm.

Recently kvm_async_page_present_sync() was added insedie the "use_mm"
section, but it seems that it doesn't need current->mm too.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Oleg Nesterov 2014-04-21 15:25:58 +02:00 committed by Paolo Bonzini
parent 198c74f43f
commit d72d946d0b
1 changed files with 0 additions and 2 deletions
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2
virt/kvm/async_pf.c
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@ -80,12 +80,10 @@ static void async_pf_execute(struct work_struct *work)
might_sleep();
use_mm(mm);
down_read(&mm->mmap_sem);
get_user_pages(current, mm, addr, 1, 1, 0, NULL, NULL);
up_read(&mm->mmap_sem);
kvm_async_page_present_sync(vcpu, apf);
unuse_mm(mm);
spin_lock(&vcpu->async_pf.lock);
list_add_tail(&apf->link, &vcpu->async_pf.done);