KVM: async_pf: change async_pf_execute() to use get_user_pages(tsk => NULL)
async_pf_execute() passes tsk == current to gup(), this is doesn't hurt but unnecessary and misleading. "tsk" is only used to account the number of faults and current is the random workqueue thread. Signed-off-by: NOleg Nesterov <oleg@redhat.com> Suggested-by: NAndrea Arcangeli <aarcange@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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