linux-kernel - Re: [PATCH] MIPS: Fix cmdline "mem=" parameter parsing

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Message-ID: <5d4d31aa-7fe5-bf8d-1d77-a1605f0c2793@flygoat.com>
Date:   Tue, 20 Apr 2021 09:05:02 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Youling Tang <tangyouling@...ngson.cn>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jinyang He <hejinyang@...ngson.cn>
Subject: Re: [PATCH] MIPS: Fix cmdline "mem=" parameter parsing


在 2021/4/19 18:50, Youling Tang 写道:
> This problem may only occur on NUMA platforms. When machine start with the
> "mem=" parameter on Loongson64, it cannot boot. When parsing the "mem="
> parameter, first remove all RAM, and then add memory through memblock_add(),
> which causes the newly added memory to be located on MAX_NUMNODES.
>
> The solution is to add the current "mem=" parameter range to the memory area
> of the corresponding node, instead of adding all of it to the MAX_NUMNODES
> node area. Get the node number corresponding to the "mem=" parameter range
> through pa_to_nid(), and then add it to the corresponding node through
> memblock_add_node().
>
> Signed-off-by: Jinyang He <hejinyang@...ngson.cn>
> Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
> ---
>   arch/mips/kernel/setup.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index 279be01..b86e241 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -359,7 +359,7 @@ static int __init early_parse_mem(char *p)
>   	if (*p == '@')
>   		start = memparse(p + 1, &p);
>   
> -	memblock_add(start, size);
> +	memblock_add_node(start, size, pa_to_nid(start));

pa_to_nid is not available for all platforms.


Thanks.

- Jiaxun

>   
>   	return 0;
>   }