linux-kernel - Re: [PATCH -next v2 1/9] blk-iocost: cleanup ioc_qos_write() and ioc_cost_model

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Message-ID: <Y4d801NjwwT0voKA@infradead.org>
Date:   Wed, 30 Nov 2022 07:54:59 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Li Nan <linan122@...wei.com>
Cc:     tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yi.zhang@...wei.com
Subject: Re: [PATCH -next v2 1/9] blk-iocost: cleanup ioc_qos_write() and
 ioc_cost_model_write()

> +	ret = nbytes;

ret is an int which bytes is a size_t.  So we at least need a ssize_t
instead for ret, and even that assumes nbytes never overflows a ssize_t.