linux-kernel - Re: [PATCH net-next 1/8] net: mscc: ocelot: strengthen type of "u32 reg" in I/O accessors

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Message-ID: <369a47f7-8194-73bc-34a4-687f2e554438@intel.com>
Date:   Wed, 12 Apr 2023 14:11:26 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, <netdev@...r.kernel.org>
CC:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Claudiu Manoil" <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <UNGLinuxDriver@...rochip.com>,
        Colin Foster <colin.foster@...advantage.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/8] net: mscc: ocelot: strengthen type of "u32
 reg" in I/O accessors



On 4/12/2023 5:47 AM, Vladimir Oltean wrote:
> The "u32 reg" argument that is passed to these functions is not a plain
> address, but rather a driver-specific encoding of another enum
> ocelot_target target in the upper bits, and an index into the
> u32 ocelot->map[target][] array in the lower bits. That encoded value
> takes the type "enum ocelot_reg" and is what is passed to these I/O
> functions, so let's actually use that to prevent type confusion.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

It  does make the prototypes a bit longer, but clarity of the type of
value you need to pass is good.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>