Re: [PATCH v3 2/5] md/raid10: don't modify 'nr_waitng' in wait_barrier() for the case nowait

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To: Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>, song@xxxxxxxxxx, guoqing.jiang@xxxxxxxxx, pmenzel@xxxxxxxxxxxxx
Subject: Re: [PATCH v3 2/5] md/raid10: don't modify 'nr_waitng' in wait_barrier() for the case nowait
From: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Date: Fri, 16 Sep 2022 12:35:47 -0600
Cc: linux-raid@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, yukuai3@xxxxxxxxxx, yi.zhang@xxxxxxxxxx
In-reply-to: <20220916113428.774061-3-yukuai1@huaweicloud.com>
References: <20220916113428.774061-1-yukuai1@huaweicloud.com> <20220916113428.774061-3-yukuai1@huaweicloud.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0


On 2022-09-16 05:34, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@xxxxxxxxxx>
> 
> For the case nowait in wait_barrier(), there is no point to increase
> nr_waiting and then decrease it.
> 
> Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>

Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>

References:
- [PATCH v3 0/5] md/raid10: reduce lock contention for io
  - From: Yu Kuai
- [PATCH v3 2/5] md/raid10: don't modify 'nr_waitng' in wait_barrier() for the case nowait
  - From: Yu Kuai

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