linux-kernel - Re: [PATCH v8 3/4] fpga: dfl: add basic support for DFHv1

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Date:   Mon, 2 Jan 2023 08:54:48 -0800 (PST)
From:   matthew.gerlach@...ux.intel.com
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc:     Tom Rix <trix@...hat.com>, hao.wu@...el.com, yilun.xu@...el.com,
        russell.h.weight@...el.com, basheer.ahmed.muddebihal@...el.com,
        mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        tianfei.zhang@...el.com, corbet@....net,
        gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        jirislaby@...nel.org, geert+renesas@...der.be,
        niklas.soderlund+renesas@...natech.se, macro@...am.me.uk,
        johan@...nel.org, lukas@...ner.de, ilpo.jarvinen@...ux.intel.com,
        marpagan@...hat.com, bagasdotme@...il.com
Subject: Re: [PATCH v8 3/4] fpga: dfl: add basic support for DFHv1



On Thu, 29 Dec 2022, Andy Shevchenko wrote:

> On Thu, Dec 29, 2022 at 08:18:03AM -0800, Tom Rix wrote:
>> On 12/28/22 10:16 AM, matthew.gerlach@...ux.intel.com wrote:
>
> ...
>
>>>   struct dfl_feature_info {
>>>   	u16 fid;
>>>   	u8 revision;
>>> +	u8 dfh_version;
>>>   	struct resource mmio_res;
>>>   	void __iomem *ioaddr;
>>>   	struct list_head node;
>>>   	unsigned int irq_base;
>>>   	unsigned int nr_irqs;
>>> +	unsigned int param_size;
>>> +	u64 params[];
>> u64 *params
>
> This will break the overflow.h macros, no?
> Besides that it will break the code for sure as it's not an equivalent.
>
>>>   };

I don't understand how this will break the overflow.h macros. The 
definition of struct dfl_feature_info and all of its uses are in a single 
file, dfl.c.

Matthew Gerlach


>
>
> -- 
> With Best Regards,
> Andy Shevchenko
>
>
>