linux-kernel - Re: [PATCH] pinctrl: zynq: Use define directive for PIN_CONFIG_IO

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Date:   Wed, 7 Nov 2018 10:00:53 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Michal Simek <michal.simek@...inx.com>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] pinctrl: zynq: Use define directive for
 PIN_CONFIG_IO_STANDARD

On 07. 11. 18 9:55, Nathan Chancellor wrote:
> On Wed, Nov 07, 2018 at 09:46:12AM +0100, Michal Simek wrote:
>> On 01. 11. 18 1:57, Nathan Chancellor wrote:
>>> Clang warns when one enumerated type is implicitly converted to another:
>>>
>>> drivers/pinctrl/pinctrl-zynq.c:985:18: warning: implicit conversion from
>>> enumeration type 'enum zynq_pin_config_param' to different enumeration
>>> type 'enum pin_config_param' [-Wenum-conversion]
>>>         {"io-standard", PIN_CONFIG_IOSTANDARD, zynq_iostd_lvcmos18},
>>>         ~               ^~~~~~~~~~~~~~~~~~~~~
>>> drivers/pinctrl/pinctrl-zynq.c:990:16: warning: implicit conversion from
>>> enumeration type 'enum zynq_pin_config_param' to different enumeration
>>> type 'enum pin_config_param' [-Wenum-conversion]
>>>         = { PCONFDUMP(PIN_CONFIG_IOSTANDARD, "IO-standard", NULL, true),
>>>             ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> ./include/linux/pinctrl/pinconf-generic.h:163:11: note: expanded from
>>> macro 'PCONFDUMP'
>>>         .param = a, .display = b, .format = c, .has_arg = d     \
>>>                  ^
>>> 2 warnings generated.
>>
>> This is interesting. I have never tried to use llvm for building the
>> kernel. Do you have any description how this can be done?
>>
> 
> Depending on what version of Clang you have access to, it is usually just as
> simple as running 'make ARCH=arm CC=clang CROSS_COMPILE=arm-linux-gnueabi-'.
> 
> Clang 7.0+ is recommended but 6.0 might work too.

TBH I would expect to download container and run this there to make sure
that I don't break anything else.

Thanks,
Michal