Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 2 Jan 2023 10:09:45 -0800 (PST)
From:   matthew.gerlach@linux.intel.com
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
cc:     Tom Rix <trix@redhat.com>, hao.wu@intel.com, yilun.xu@intel.com,
        russell.h.weight@intel.com, basheer.ahmed.muddebihal@intel.com,
        mdf@kernel.org, linux-fpga@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        tianfei.zhang@intel.com, corbet@lwn.net,
        gregkh@linuxfoundation.org, linux-serial@vger.kernel.org,
        jirislaby@kernel.org, geert+renesas@glider.be,
        niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk,
        johan@kernel.org, lukas@wunner.de, ilpo.jarvinen@linux.intel.com,
        marpagan@redhat.com, bagasdotme@gmail.com
Subject: Re: [PATCH v8 3/4] fpga: dfl: add basic support for DFHv1
In-Reply-To: <Y7MUOQ/X/ls5/+RP@smile.fi.intel.com>
Message-ID: <alpine.DEB.2.22.394.2301020955550.2536944@rhweight-WRK1>
References: <20221228181624.1793433-1-matthew.gerlach@linux.intel.com> <20221228181624.1793433-4-matthew.gerlach@linux.intel.com> <628c125a-5a84-e1bd-7724-2637315cc35e@redhat.com> <Y637aBTrbRloUtvD@smile.fi.intel.com> <alpine.DEB.2.22.394.2301020852500.2516029@rhweight-WRK1>
 <Y7MT6e8c2VLCjZuw@smile.fi.intel.com> <Y7MUOQ/X/ls5/+RP@smile.fi.intel.com>
User-Agent: Alpine 2.22 (DEB 394 2020-01-19)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII; format=flowed
Precedence: bulk


On Mon, 2 Jan 2023, Andy Shevchenko wrote:

> On Mon, Jan 02, 2023 at 07:27:06PM +0200, Andy Shevchenko wrote:
>> On Mon, Jan 02, 2023 at 08:54:48AM -0800, matthew.gerlach@linux.intel.com wrote:
>>> 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@linux.intel.com wrote:
>
> ...
>
>>>>>> +	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.
>>
>> Hint: __must_be_array()
>>
>> As I said, the proposed change is not acceptable since it's not an equivalent.
>
> Ah, you meant that there is no use of macros from overflow in the dfl.c?
> IIRC we discussed that some of the code may make use of them, or am I
> mistaken?

There currently is one usage of struct_size() from overflow.h in dfl.c, 
and my patch adds another usage of struct_size(). struct dfl_feature_info 
ends with a trailing array of u64.

I think the confusion is with struct dfl_feature and/or struct struct 
dfl_device. Those structs don't end with a trailing array, and those 
structs are not used with macros from overview.h.

Thanks for the feedback,
Matthew Gerlach

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