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Sender: Guenter Roeck <groeck7@gmail.com>
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Date:   Sat, 1 Jul 2023 09:22:11 -0700
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To:     Doug Anderson <dianders@chromium.org>
Cc:     Petr Mladek <pmladek@suse.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        kgdb-bugreport@lists.sourceforge.net, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org,
        Nicholas Piggin <npiggin@gmail.com>,
        sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        "David S . Miller" <davem@davemloft.net>
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From:   Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v2 6/6] watchdog/hardlockup: Define
 HARDLOCKUP_DETECTOR_ARCH
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On 7/1/23 09:08, Doug Anderson wrote:
> Hi,
> 
> On Sat, Jul 1, 2023 at 7:40 AM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On Fri, Jun 16, 2023 at 05:06:18PM +0200, Petr Mladek wrote:
>>> The HAVE_ prefix means that the code could be enabled. Add another
>>> variable for HAVE_HARDLOCKUP_DETECTOR_ARCH without this prefix.
>>> It will be set when it should be built. It will make it compatible
>>> with the other hardlockup detectors.
>>>
>>> The change allows to clean up dependencies of PPC_WATCHDOG
>>> and HAVE_HARDLOCKUP_DETECTOR_PERF definitions for powerpc.
>>>
>>> As a result HAVE_HARDLOCKUP_DETECTOR_PERF has the same dependencies
>>> on arm, x86, powerpc architectures.
>>>
>>> Signed-off-by: Petr Mladek <pmladek@suse.com>
>>> Reviewed-by: Douglas Anderson <dianders@chromium.org>
>>> ---
>> ...
>>> --- a/include/linux/nmi.h
>>> +++ b/include/linux/nmi.h
>>> @@ -9,7 +9,7 @@
>>>   #include <asm/irq.h>
>>>
>>>   /* Arch specific watchdogs might need to share extra watchdog-related APIs. */
>>> -#if defined(CONFIG_HAVE_HARDLOCKUP_DETECTOR_ARCH) || defined(CONFIG_HARDLOCKUP_DETECTOR_SPARC64)
>>> +#if defined(CONFIG_HARDLOCKUP_DETECTOR_ARCH) || defined(CONFIG_HARDLOCKUP_DETECTOR_SPARC64)
>>
>> This results in:
>>
>> arch/powerpc/platforms/pseries/mobility.c: In function 'pseries_migrate_partition':
>> arch/powerpc/platforms/pseries/mobility.c:753:17: error: implicit declaration of function 'watchdog_hardlockup_set_timeout_pct'; did you mean 'watchdog_hardlockup_stop'? [-Werror=implicit-function-declaration]
>>    753 |                 watchdog_hardlockup_set_timeout_pct(factor);
>>
>> with ppc64_defconfig -CONFIG_HARDLOCKUP_DETECTOR, because the dummy
>> for watchdog_hardlockup_set_timeout_pct() is still defined in
>> arch/powerpc/include/asm/nmi.h which is no longer included.
> 
> Can you test with:
> 
> https://lore.kernel.org/r/20230629124500.1.I55e2f4e7903d686c4484cb23c033c6a9e1a9d4c4@changeid
> 

Ah, I didn't find that one. Sorry for the noise.

Yes, that should work. It is a bit odd that including both linux/nmi.h
and asm/nmi.h is required, but as it turns out that is actually quite common.

Thanks,
Guenter