linux-kernel - Re: [PATCH 2/4] fpga: dfl: Move DFH header register macros to linux/dfl.h

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Date:   Wed, 23 Jun 2021 13:44:01 +0200
From:   Martin Hundebøll <mhu@...icom.dk>
To:     Tom Rix <trix@...hat.com>, Wu Hao <hao.wu@...el.com>,
        Moritz Fischer <mdf@...nel.org>, Xu Yilun <yilun.xu@...el.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>
Cc:     Martin Hundebøll <mhu@...nix.com>,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-spi@...r.kernel.org,
        Debarati Biswas <debaratix.biswas@...el.com>,
        Russ Weight <russell.h.weight@...el.com>
Subject: Re: [PATCH 2/4] fpga: dfl: Move DFH header register macros to
 linux/dfl.h

On 21/06/2021 15.56, Tom Rix wrote:
> 
> On 6/21/21 12:06 AM, Martin Hundebøll wrote:
>> From: Debarati Biswas <debaratix.biswas@...el.com>
>>
>> Device Feature List (DFL) drivers may be defined in subdirectories other
>> than drivers/fpga, and each DFL driver should have access to the Device
>> Feature Header (DFH) register, which contains revision and type
>> information. This change moves the macros specific to the DFH register
>> from drivers/fpga/dfl.h to include/linux/dfl.h.
>>
>> Signed-off-by: Debarati Biswas <debaratix.biswas@...el.com>
>> Signed-off-by: Russ Weight <russell.h.weight@...el.com>
>> Signed-off-by: Martin Hundebøll <mhu@...icom.dk>
>> ---
>>   drivers/fpga/dfl.h  | 48 +----------------------------------------
>>   include/linux/dfl.h | 52 +++++++++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 53 insertions(+), 47 deletions(-)
>>
>> diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
>> index 2b82c96ba56c..6ed0353e9a99 100644
>> --- a/drivers/fpga/dfl.h
>> +++ b/drivers/fpga/dfl.h
>> @@ -17,6 +17,7 @@
>>   #include <linux/bitfield.h>
> 
> bitfield.h was added to linux/dfl.h
> 
> Likely both aren't needed, try removing this one.

After this patch both headers use GENMASK_ULL() and BIT_ULL(), which are both defined in linux/bits.h, so I would expect both to include that instead. A lot of the users of dfl.h uses FIELD_GET(), which is defined in linux/bitfield.h, so I would expect that to be included there instead.

I can prepare a patch to fix that up, if you like?

// Martin