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由 Stefan Bühler 提交于
The memory operations before reading cq head are unrelated and we don't care about their order. Document that the control dependency in combination with READ_ONCE and WRITE_ONCE forms a barrier we need. Signed-off-by: NStefan Bühler <source@stbuehler.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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