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block, bfq: clarify the goal of bfq_split_bfqq()

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The exact, general goal of the function bfq_split_bfqq() is not that
apparent. Add a comment to make it clear.

Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Paolo Valente 2020-02-03 11:41:00 +01:00 committed by Jens Axboe
parent db37a34c56
commit c92bddee77
1 changed files with 2 additions and 0 deletions
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block/bfq-iosched.c
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@ -5979,6 +5979,8 @@ static void bfq_finish_requeue_request(struct request *rq)
}
/*
* Removes the association between the current task and bfqq, assuming
* that bic points to the bfq iocontext of the task.
* Returns NULL if a new bfqq should be allocated, or the old bfqq if this
* was the last process referring to that bfqq.
*/