linux-kernel - Re: [PATCH] LoongArch: Let cores_io_master cover the largest NR

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Date: Mon, 25 Dec 2023 17:13:26 +0800
From: maobibo <maobibo@...ngson.cn>
To: loongson-kernel@...ts.loongnix.cn, Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev, Xuefeng Li <lixuefeng@...ngson.cn>,
 Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
 Jiaxun Yang <jiaxun.yang@...goat.com>, linux-kernel@...r.kernel.org,
 Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH] LoongArch: Let cores_io_master cover the largest NR_CPUS



On 2023/12/25 下午3:00, Huacai Chen wrote:
> Now loongson_system_configuration::cores_io_master only covers 64 cpus,
> if NR_CPUS > 64 there will be memory corruption. So let cores_io_master
> cover the largest NR_CPUS (256).
> 
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>   arch/loongarch/include/asm/bootinfo.h | 4 ++--
>   arch/loongarch/kernel/acpi.c          | 2 +-
>   arch/loongarch/kernel/smp.c           | 2 +-
>   3 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/loongarch/include/asm/bootinfo.h b/arch/loongarch/include/asm/bootinfo.h
> index c60796869b2b..32fd0319594a 100644
> --- a/arch/loongarch/include/asm/bootinfo.h
> +++ b/arch/loongarch/include/asm/bootinfo.h
> @@ -30,7 +30,7 @@ struct loongson_system_configuration {
>   	int boot_cpu_id;
>   	int cores_per_node;
>   	int cores_per_package;
> -	unsigned long cores_io_master;
> +	unsigned long cores_io_master[4];
Can the hardcoded 4 be defined something like this?
    DIV_ROUND_UP(CONFIG_NR_CPUS, sizeof(long))

the others LGTM.

Regards
Bibo Mao
>   	unsigned long suspend_addr;
>   	const char *cpuname;
>   };
> @@ -42,7 +42,7 @@ extern struct loongson_system_configuration loongson_sysconf;
>   
>   static inline bool io_master(int cpu)
>   {
> -	return test_bit(cpu, &loongson_sysconf.cores_io_master);
> +	return test_bit(cpu, loongson_sysconf.cores_io_master);
>   }
>   
>   #endif /* _ASM_BOOTINFO_H */
> diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
> index 8e00a754e548..b6b097bbf866 100644
> --- a/arch/loongarch/kernel/acpi.c
> +++ b/arch/loongarch/kernel/acpi.c
> @@ -119,7 +119,7 @@ acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long e
>   		return -EINVAL;
>   
>   	core = eiointc->node * CORES_PER_EIO_NODE;
> -	set_bit(core, &(loongson_sysconf.cores_io_master));
> +	set_bit(core, loongson_sysconf.cores_io_master);
>   
>   	return 0;
>   }
> diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
> index 9e33b5e36122..a16e3dbe9f09 100644
> --- a/arch/loongarch/kernel/smp.c
> +++ b/arch/loongarch/kernel/smp.c
> @@ -208,7 +208,7 @@ static void __init fdt_smp_setup(void)
>   	}
>   
>   	loongson_sysconf.nr_cpus = num_processors;
> -	set_bit(0, &(loongson_sysconf.cores_io_master));
> +	set_bit(0, loongson_sysconf.cores_io_master);
>   #endif
>   }
>   
>