block: export block_unplug tracepoint
This allows stacked devices (like md/raid5) to provide blktrace tracing, including unplug events. Reported-by: NFengguang Wu <fengguang.wu@intel.com> Signed-off-by: NNeilBrown <neilb@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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