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c9f2946fbe
A context switch will force a call to flush_tlb_pending() (via switch_to()), so if we test tlb_nr to be non-zero, then sleep, it would become zero and later back at the original context we'll pass zero down into the TLB flushing code which should never see a nr argument of zero. Signed-off-by: David S. Miller <davem@davemloft.net>