netdev - Re: [PATCH net-next 5/8] devlink: refactor region_read_snapshot

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Message-ID: <20221118174824.513e15d8@kernel.org>
Date:   Fri, 18 Nov 2022 17:48:24 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org, Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH net-next 5/8] devlink: refactor
 region_read_snapshot_fill to use a callback function

On Thu, 17 Nov 2022 14:08:00 -0800 Jacob Keller wrote:
> +	/* Allocate and re-use a single buffer */
> +	data = kzalloc(DEVLINK_REGION_READ_CHUNK_SIZE, GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;

Why zalloc? If we expect drivers may underfill we should let them
return actual length.