linux-kernel - [PATCH 1/3] loongarch: Call arch_mem_init() before platform

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Date: Fri, 9 Feb 2024 16:29:29 -0800
From: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
To: <chenhuacai@...nel.org>, <jonas@...thpole.se>,
        <stefan.kristiansson@...nalahti.fi>, <shorne@...il.com>,
        <ysato@...rs.sourceforge.jp>, <dalias@...c.org>,
        <glaubitz@...sik.fu-berlin.de>, <robh+dt@...nel.org>,
        <frowand.list@...il.com>
CC: <linux-openrisc@...r.kernel.org>, <loongarch@...ts.linux.dev>,
        <linux-sh@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <kernel@...cinc.com>,
        Oreoluwa Babatunde
	<quic_obabatun@...cinc.com>
Subject: [PATCH 1/3] loongarch: Call arch_mem_init() before platform_init() in the init sequence

The platform_init() function which is called during device bootup
contains a few calls to memblock_alloc().
This is an issue because these allocations are done before reserved
memory regions are set aside in arch_mem_init().
This means that there is a possibility for memblock to allocate memory
from any of the reserved memory regions.

Hence, move the call to arch_mem_init() to be earlier in the init
sequence so that all reserved memory is set aside before any allocations
are made with memblock.

Signed-off-by: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
---
 arch/loongarch/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index edf2bba..66c307c 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -597,8 +597,8 @@ void __init setup_arch(char **cmdline_p)
 	parse_early_param();
 	reserve_initrd_mem();
 
-	platform_init();
 	arch_mem_init(cmdline_p);
+	platform_init();
 
 	resource_init();
 #ifdef CONFIG_SMP
--