linux-kernel - Re: [PATCH] MIPS: Loongson64: Fix build error 'secondary_kexec

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Date:   Thu, 6 May 2021 11:02:23 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Jinyang He <hejinyang@...ngson.cn>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Loongson64: Fix build error 'secondary_kexec_args'
 undeclared under !SMP

Hi, Jinyang

On 05/06/2021 10:21 AM, Jinyang He wrote:
> On 05/06/2021 10:02 AM, Youling Tang wrote:
>
>> On the Loongson64 platform, if CONFIG_SMP is not set, the following 
>> build
>> error will occur:
>> arch/mips/loongson64/reset.c:133:2: error:'secondary_kexec_args' 
>> undeclared
>>
>> Because the definition and declaration of secondary_kexec_args are in 
>> the
>> CONFIG_SMP, the secondary_kexec_args variable should be used in 
>> CONFIG_SMP.
>>
>> Reported-by: kernel test robot <lkp@...el.com>
>> Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
>> ---
>>   arch/mips/loongson64/reset.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/mips/loongson64/reset.c b/arch/mips/loongson64/reset.c
>> index c97bfdc..758d5d2 100644
>> --- a/arch/mips/loongson64/reset.c
>> +++ b/arch/mips/loongson64/reset.c
>> @@ -126,11 +126,12 @@ static void loongson_kexec_shutdown(void)
>>       for_each_possible_cpu(cpu)
>>           if (!cpu_online(cpu))
>>               cpu_device_up(get_cpu_device(cpu));
>> +
>> +    secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
>>   #endif
>>       kexec_args[0] = kexec_argc;
>>       kexec_args[1] = fw_arg1;
>>       kexec_args[2] = fw_arg2;
>> -    secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
>>       memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
>>       memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
>>   }
>> @@ -141,7 +142,9 @@ static void loongson_crash_shutdown(struct 
>> pt_regs *regs)
>>       kexec_args[0] = kdump_argc;
>>       kexec_args[1] = fw_arg1;
>>       kexec_args[2] = fw_arg2;
>> +#ifdef CONFIG_SMP
>>       secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
>> +#endif
>>       memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE);
>>       memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
>>   }
>
> Hi, Youling,
>
> The earlier fix is here,
> https://lkml.org/lkml/2021/4/30/874
>
Thank you for reminding me.

Thanks,
Youling.
> Thanks.