linux-kernel - Re: [PATCH block/for-next] blk-iocost: fix divide-by-zero in transfer

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Message-ID: <ff46ca79-433e-3279-a8eb-35156639be7b@kernel.dk>
Date:   Fri, 11 Sep 2020 11:10:58 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, cgroups@...r.kernel.org
Subject: Re: [PATCH block/for-next] blk-iocost: fix divide-by-zero in
 transfer_surpluses()

On 9/11/20 11:07 AM, Tejun Heo wrote:
> Conceptually, root_iocg->hweight_donating must be less than WEIGHT_ONE but
> all hweight calculations round up and thus it may end up >= WEIGHT_ONE
> triggering divide-by-zero and other issues. Bound the value to avoid
> surprises.

Applied, thanks.

-- 
Jens Axboe