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

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Message-Id: <1618829425-11873-1-git-send-email-tangyouling@loongson.cn>
Date:   Mon, 19 Apr 2021 18:50:25 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jinyang He <hejinyang@...ngson.cn>
Subject: [PATCH] MIPS: Fix cmdline "mem=" parameter parsing

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));

 	return 0;
 }
-- 
2.1.0