x86: UV fix uv_flush_send_and_wait()
Impact: fix possible tlb mis-flushing on UV uv_flush_send_and_wait() should return a pointer if the broadcast remote tlb shootdown requests fail. That causes the conventional IPI method of shootdown to be used. Signed-off-by: NCliff Wickman <cpw@sgi.com> Signed-off-by: NTejun Heo <tj@kernel.org>
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