Re: [PATCH] powerpc: Fix HAVE_HARDLOCKUP_DETECTOR_ARCH build configuration

[Chen Huang]

在 2021/3/28 19:06, Christophe Leroy 写道:
> 
> 
> Le 27/03/2021 à 10:49, Chen Huang a écrit :
>> When compiling the powerpc with the SMP disabled, it shows the issue:
>>
>> arch/powerpc/kernel/watchdog.c: In function ‘watchdog_smp_panic’:
>> arch/powerpc/kernel/watchdog.c:177:4: error: implicit declaration of function ‘smp_send_nmi_ipi’; did you mean ‘smp_send_stop’? [-Werror=implicit-function-declaration]
>>    177 |    smp_send_nmi_ipi(c, wd_lockup_ipi, 1000000);
>>        |    ^~~~~~~~~~~~~~~~
>>        |    smp_send_stop
>> cc1: all warnings being treated as errors
>> make[2]: *** [scripts/Makefile.build:273: arch/powerpc/kernel/watchdog.o] Error 1
>> make[1]: *** [scripts/Makefile.build:534: arch/powerpc/kernel] Error 2
>> make: *** [Makefile:1980: arch/powerpc] Error 2
>> make: *** Waiting for unfinished jobs....
>>
>> We found that powerpc used ipi to implement hardlockup watchdog, so the
>> HAVE_HARDLOCKUP_DETECTOR_ARCH should depend on the SMP.
>>
>> Fixes: 2104180a5369 ("powerpc/64s: implement arch-specific hardlockup watchdog")
>> Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
>> Signed-off-by: Chen Huang <chenhuang5@xxxxxxxxxx>
>> ---
>>   arch/powerpc/Kconfig | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>> index 764df010baee..2d4f37b117ce 100644
>> --- a/arch/powerpc/Kconfig
>> +++ b/arch/powerpc/Kconfig
>> @@ -225,7 +225,7 @@ config PPC
>>       select HAVE_LIVEPATCH            if HAVE_DYNAMIC_FTRACE_WITH_REGS
>>       select HAVE_MOD_ARCH_SPECIFIC
>>       select HAVE_NMI                if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
>> -    select HAVE_HARDLOCKUP_DETECTOR_ARCH    if (PPC64 && PPC_BOOK3S)
>> +    select HAVE_HARDLOCKUP_DETECTOR_ARCH    if PPC64 && PPC_BOOK3S && SMP
> 
> While modifying this line, you should restore the alphabetic order by moving it up.
> 
> You can use PPC_BOOK3S_64 instead of PPC64 && PPC_BOOK3S
> 

I will modify it. Thanks!

>>       select HAVE_OPTPROBES            if PPC64
>>       select HAVE_PERF_EVENTS
>>       select HAVE_PERF_EVENTS_NMI        if PPC64
>>
> .