linux-kernel - Re: [PATCH] netlink: use 48 byte ctx instead of 6 signed longs for callback

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Message-Id: <20190701.191227.1363312826504012690.davem@davemloft.net>
Date:   Mon, 01 Jul 2019 19:12:27 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     johannes@...solutions.net
Cc:     Jason@...c4.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netlink: use 48 byte ctx instead of 6 signed longs for
 callback

From: Johannes Berg <johannes@...solutions.net>
Date: Fri, 28 Jun 2019 16:42:26 +0200

> On Fri, 2019-06-28 at 16:40 +0200, Jason A. Donenfeld wrote:
>> People are inclined to stuff random things into cb->args[n] because it
>> looks like an array of integers. Sometimes people even put u64s in there
>> with comments noting that a certain member takes up two slots. The
>> horror! Really this should mirror the usage of skb->cb, which are just
>> 48 opaque bytes suitable for casting a struct. Then people can create
>> their usual casting macros for accessing strongly typed members of a
>> struct.
>> 
>> As a plus, this also gives us the same amount of space on 32bit and 64bit.
>> 
>> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
>> Cc: Johannes Berg <johannes@...solutions.net>
> 
> Reviewed-by: Johannes Berg <johannes@...solutions.net>

Applied to net-next.