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Subject: Re: [PATCH] MIPS: Loongson64: Fix build error 'secondary_kexec_args'
 undeclared under !SMP
To:     Youling Tang <tangyouling@loongson.cn>,
        Huacai Chen <chenhuacai@kernel.org>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc:     linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
References: <1620266570-21585-1-git-send-email-tangyouling@loongson.cn>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <1e8a74a8-3139-c77a-3eab-4ae0ff42ee0b@infradead.org>
Date:   Wed, 5 May 2021 19:19:27 -0700
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On 5/5/21 7:02 PM, 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@intel.com>
> Signed-off-by: Youling Tang <tangyouling@loongson.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);
>  }
> 


Acked-by: Randy Dunlap <rdunlap@infradead.org>

Yep, slightly better than my version:
https://lore.kernel.org/lkml/20210430205055.13594-1-rdunlap@infradead.org/

-- 
~Randy