smp: export __smp_call_function_single()
The blk-mq core and the blk-mq null driver uses it. Reviewed-by: NChristoph Hellwig <hch@lst.de> Acked-by: NIngo Molnar <mingo@kernel.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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