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Date: Thu, 7 Dec 2023 00:23:01 -0800
From: Christoph Hellwig <hch@infradead.org>
To: Sergei Shtepa <sergei.shtepa@linux.dev>
Cc: axboe@kernel.dk, hch@infradead.org, corbet@lwn.net, snitzer@kernel.org,
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	Sergei Shtepa <sergei.shtepa@veeam.com>
Subject: Re: [PATCH v6 06/11] blksnap: handling and tracking I/O units
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 <20231124165933.27580-7-sergei.shtepa@linux.dev>
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> +
> +static int (*const ctl_table[])(struct tracker *tracker,
> +				__u8 __user *buf, __u32 *plen) = {
> +	ctl_cbtinfo,
> +	ctl_cbtmap,
> +	ctl_cbtdirty,
> +	ctl_snapshotadd,
> +	ctl_snapshotinfo,
> +};

Please use a switch statement like the rest of the kernel.  Besides
being simple to follow it also avoid having a speculation gadget
on user controlled input.