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

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Date:   Thu, 6 May 2021 10:21:39 +0800
From:   Jinyang He <hejinyang@...ngson.cn>
To:     Youling Tang <tangyouling@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH] MIPS: Loongson64: Fix build error 'secondary_kexec_args'
 undeclared under !SMP

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

Thanks.