From: Jens Axboe <axboe@kernel.dk>
To: Tejun Heo <tj@kernel.org>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com, cgroups@vger.kernel.org
Subject: Re: [PATCH block/for-next] blk-iocost: fix divide-by-zero in transfer_surpluses()
Date: Fri, 11 Sep 2020 11:10:58 -0600 [thread overview]
Message-ID: <ff46ca79-433e-3279-a8eb-35156639be7b@kernel.dk> (raw)
In-Reply-To: <20200911170746.GG4295@mtj.thefacebook.com>
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
next prev parent reply other threads:[~2020-09-11 17:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-11 17:07 [PATCH block/for-next] blk-iocost: fix divide-by-zero in transfer_surpluses() Tejun Heo
2020-09-11 17:10 ` Jens Axboe [this message]
2020-09-11 22:40 ` [PATCH v2 " Tejun Heo
2020-09-11 22:43 ` Jens Axboe
2020-09-11 22:44 ` Tejun Heo
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