linux-kernel - Re: [PATCH 1/7] blk-mq: protect completion path with RCU

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Message-ID: <20171229100418.GB4020@infradead.org>
Date:   Fri, 29 Dec 2017 02:04:18 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     jack@...e.cz, axboe@...nel.dk, clm@...com, jbacik@...com,
        kernel-team@...com, linux-kernel@...r.kernel.org,
        linux-btrfs@...r.kernel.org, peterz@...radead.org,
        jianchao.w.wang@...cle.com, Bart.VanAssche@....com
Subject: Re: [PATCH 1/7] blk-mq: protect completion path with RCU

Why do you need the srcu protection?  The completion path can never
sleep.

If there is a good reason to keep it please add commment, and
make the srcu variant a separate function only used by drivers that
need it instead of adding the conditional.