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Subject: Re: [PATCH] MIPS: Add KSEG*ADDR definitions to CONFIG_64BIT
To:     Denis Efremov <efremov@linux.com>,
        Paul Burton <paulburton@kernel.org>
Cc:     Ralf Baechle <ralf@linux-mips.org>,
        James Hogan <jhogan@kernel.org>, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20191210172739.27131-1-efremov@linux.com>
 <20191210185716.3lkhbuuqtzj2vs3l@lantea.localdomain>
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From:   Florian Fainelli <f.fainelli@gmail.com>
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Message-ID: <d709de95-c736-464d-9a92-e7b4df5df697@gmail.com>
Date:   Tue, 10 Dec 2019 15:04:35 -0800
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Sender: linux-kernel-owner@vger.kernel.org
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On 12/10/19 12:14 PM, Denis Efremov wrote:
> Hi,
> 
> On 10.12.2019 21:57, Paul Burton wrote:
>> Hi Denis,
>>
>> On Tue, Dec 10, 2019 at 08:27:39PM +0300, Denis Efremov wrote:
>>> The patch adds KSEG0ADDR, KSEG1ADDR, KSEG2ADDR, KSEG3ADDR
>>> definitions to CONFIG_64BIT ifdef. This fixes broken compilation:
>>>   CC      drivers/watchdog/mtx-1_wdt.o
>>> In file included from drivers/watchdog/mtx-1_wdt.c:44:
>>> ./arch/mips/include/asm/mach-au1x00/au1000.h: In function ‘alchemy_rdsys’:
>>> ./arch/mips/include/asm/mach-au1x00/au1000.h:603:36: error: implicit
>>>   declaration of function ‘KSEG1ADDR’; did you mean ‘CKSEG1ADDR’?
>>>   [-Werror=implicit-function-declaration]
>>
>> Since this driver is meant to run on a system that only supports 32 bit
>> kernels, I think it would be better to correct its dependencies in
>> Kconfig like so:
>>
>> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
>> index 58e7c100b6ad..509cbb6d2cea 100644
>> --- a/drivers/watchdog/Kconfig
>> +++ b/drivers/watchdog/Kconfig
>> @@ -1648,7 +1648,7 @@ config JZ4740_WDT
>>
>>  config WDT_MTX1
>>         tristate "MTX-1 Hardware Watchdog"
>> -       depends on MIPS_MTX1 || (MIPS && COMPILE_TEST)
>> +       depends on MIPS_MTX1 || (MIPS && 32BIT && COMPILE_TEST)
>>         help
>>           Hardware driver for the MTX-1 boards. This is a watchdog timer that
>>           will reboot the machine after a 100 seconds timer expired.
>>
>> And mark this with the appropriate fixes tag:
>>
>>   Fixes: da2a68b3eb47 ("watchdog: Enable COMPILE_TEST where possible")
>>
>> What do you think?
>>
>> Alternatively the driver could just use the existing & equivalent
>> CKSEG1ADDR() macro as the compiler suggested, but in that case it'd be
>> good to check that's the only change needed to build cleanly with
>> CONFIG_64BIT=y.
>>
> 
> Thank you for the suggestion. I will prepare V2 and fix the same way other
> drivers that break the compilation with CONFIG_64BIT and missing KSEG1ADDR.

There is a much simpler solution actually:

diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
index 8aa1cb4a295f..ea1bbf5ee528 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;

and then you can even push this further with:

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 1679e0dc869b..982897ff074e 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1651,7 +1651,7 @@ config JZ4740_WDT

 config WDT_MTX1
        tristate "MTX-1 Hardware Watchdog"
-       depends on MIPS_MTX1 || (MIPS && COMPILE_TEST)
+       depends on MIPS_MTX1 || COMPILE_TEST
        help
          Hardware driver for the MTX-1 boards. This is a watchdog timer
that
          will reboot the machine after a 100 seconds timer expired.

I checked both an alchemy, non-alchemy MIPS build as well as a x86_64
build with the two patches applied.

In fact, this entire driver is just an older version of
drivers/watchdog/gpio_wdt.c and should be converted to it, if only I had
that box available.
-- 
Florian