linux-kernel - Re: [PATCH -next 4/5] blk-iocost: fix sleeping in atomic context warnning in ioc_qos

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Message-ID: <Y15KC8Zb3rHlfTPu@infradead.org>
Date:   Sun, 30 Oct 2022 02:55:23 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk,
        yukuai3@...wei.com, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com
Subject: Re: [PATCH -next 4/5] blk-iocost: fix sleeping in atomic context
 warnning in ioc_qos_write()

This seems a little convoluted to me.  I'd suggest to add a new
sleeping lock that protects the updates, then you just take the
spinlock after parsing without much other changes.

(The same comment also applies to patch 5).