linux-kernel - Re: [PATCH] MIPS: Add set_memory

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Message-ID: <20201013211610.GA27034@alpha.franken.de>
Date:   Tue, 13 Oct 2020 23:16:10 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Jinyang He <hejinyang@...ngson.cn>
Cc:     Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Add set_memory_node()

On Tue, Oct 13, 2020 at 11:19:43AM +0800, Jinyang He wrote:
> Commit e7ae8d174eec ("MIPS: replace add_memory_region with memblock")

this commit just changed code and doesn't change the problem you want to
solve.

> replaced add_memory_region(, , BOOT_MEM_RAM) with memblock_add(). But
> it doesn't work well on some platforms which have NUMA like Loongson64.
> Because memblock_add() calls memblock_add_range() and sets memory at
> MAX_NUMNODES. As mm/memblock.c says, assign the region to a NUMA node
> later by using memblock_set_node(). This patch provides a NUMA port

so it says later, which doesn't have to be right after the memblock_add.
I don't know why you need the whole mem=/memmap= game, but please do a

for_each_memblock(...) 
	memblock_set_node(...);

somewhere in arch/mips/loongson64 to fix up the memory blocks as needed.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]