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Subject: Re: [PATCH 1/2] watchdog: mtx-1: Drop au1000.h header inclusion
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     linux-watchdog@vger.kernel.org,
        Wim Van Sebroeck <wim@linux-watchdog.org>,
        open list <linux-kernel@vger.kernel.org>,
        linux-mips@linux-mips.org, Paul Burton <paulburton@kernel.org>,
        Denis Efremov <efremov@linux.com>
References: <20191211210204.31579-1-f.fainelli@gmail.com>
 <20191211210204.31579-2-f.fainelli@gmail.com>
 <21b7be75-db61-3b14-c57c-04af0b78b347@roeck-us.net>
 <3fdc99fa-f75c-33d4-e1c4-ec8ad185e2cd@gmail.com>
 <20191212181902.GA31779@roeck-us.net>
From:   Florian Fainelli <f.fainelli@gmail.com>
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Message-ID: <1bb1d080-b13e-e785-5ea7-760e5ac215f0@gmail.com>
Date:   Thu, 12 Dec 2019 10:28:48 -0800
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Sender: linux-kernel-owner@vger.kernel.org
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On 12/12/19 10:19 AM, Guenter Roeck wrote:
> On Wed, Dec 11, 2019 at 07:38:29PM -0800, Florian Fainelli wrote:
>>
>>
>> On 12/11/2019 5:35 PM, Guenter Roeck wrote:
>>> On 12/11/19 1:02 PM, Florian Fainelli wrote:
>>>> Including au1000.h from the machine specific header directory prevents
>>>> this driver from being built on any other platforms (MIPS included).
>>>> Since we do not use any definitions, drop it.
>>>>
>>>> Reported-by: Denis Efremov <efremov@linux.com>
>>>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>>>> ---
>>>>   drivers/watchdog/mtx-1_wdt.c | 2 --
>>>>   1 file changed, 2 deletions(-)
>>>>
>>>> diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
>>>> index 25a92857b217..aeca22f7450e 100644
>>>> --- a/drivers/watchdog/mtx-1_wdt.c
>>>> +++ b/drivers/watchdog/mtx-1_wdt.c
>>>> @@ -41,8 +41,6 @@
>>>>   #include <linux/uaccess.h>
>>>>   #include <linux/gpio/consumer.h>
>>>>   -#include <asm/mach-au1x00/au1000.h>
>>>> -
>>>>   #define MTX1_WDT_INTERVAL    (5 * HZ)
>>>>     static int ticks = 100 * HZ;
>>>>
>>>
>>> Given that this is nothing but yet another gpio watchdog driver, I'd
>>> personally rather have it merged with gpio_wdt.c. On a higher level,
>>> cleaning up old-style watchdog drivers, without converting them to
>>> using the watchdog core, is a waste of time.
>>
>> If that makes you feel any better, I was not planning on going further
>> than that, and yes, removing this driver and using gpio_wdt.c would be
>> the way to go, this driver greatly predates gpio_wdt.c and I have since
>> then not had access to my MTX-1 platforms which is why this did not
>> happen. We can attempt a "blind conversion" without testing, but what
>> good would that make, not sure.
>>
> 
> It sounds like this is a purely cosmetical change to improve test build
> coverage for a more or less obsolete driver. No, that doesn't make me feel
> better; I get way too many of those lately. Worse, some of those test build
> "improvements" actually end up breaking real builds, which then costs me
> and others even more time to track down.
> 
> We should really discourage that. Is there some challenge going on somewhere,
> along the line of "improve test build coverage" ?

Not really, the only challenge would be access to the original hardware
in order to remove the driver and migrate over to gpio_wdt, which is low
risk, but the watchdog on that platform has bitten me before.
-- 
Florian