linux-kernel - [PATCH 24/46] mips: resrved_mem: Move fdt_init_reserved_mem() below unflatten_device

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Message-ID: <20240126235425.12233-25-quic_obabatun@quicinc.com>
Date: Fri, 26 Jan 2024 15:54:03 -0800
From: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <robh+dt@...nel.org>,
        <frowand.list@...il.com>, <vgupta@...nel.org>, <arnd@...db.de>,
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        <monstr@...str.eu>, <palmer@...belt.com>, <aou@...s.berkeley.edu>,
        <dinguyen@...nel.org>, <chenhuacai@...nel.org>,
        <tsbogend@...ha.franken.de>, <jonas@...thpole.se>,
        <stefan.kristiansson@...nalahti.fi>, <shorne@...il.com>,
        <mpe@...erman.id.au>, <ysato@...rs.sourceforge.jp>, <dalias@...c.org>,
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        <chris@...kel.net>, <jcmvbkbc@...il.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <kernel@...cinc.com>, Oreoluwa Babatunde <quic_obabatun@...cinc.com>
Subject: [PATCH 24/46] mips: resrved_mem: Move fdt_init_reserved_mem() below unflatten_device_tree()

The unflattened devicetree structure is available to be used not long
after the page tables have been set up on most architectures, and is
available even before that on other architectures.

Hence, move the call to fdt_init_reserved_mem() to after
unflatten_device_tree() is called so that the reserved memory nodes can
be accessed using the unflattened device tree APIs.

Using the unflattened devicetree APIs is more efficient than using the
flattened devicetree APIs.

Signed-off-by: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
---
 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 13e862151d5f..eeafc3abcb96 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -651,7 +651,6 @@ static void __init arch_mem_init(char **cmdline_p)
 
 	early_init_fdt_reserve_self();
 	early_fdt_scan_reserved_mem();
-	fdt_init_reserved_mem();
 
 #ifndef CONFIG_NUMA
 	memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
@@ -672,6 +671,7 @@ static void __init arch_mem_init(char **cmdline_p)
 	mips_parse_crashkernel();
 	device_tree_init();
 
+	fdt_init_reserved_mem();
 	/*
 	 * In order to reduce the possibility of kernel panic when failed to
 	 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
-- 
2.17.1