linux-kernel - [PATCH 2/3] openrisc: Call setup_memory() earlier in the init sequence

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Date: Fri, 9 Feb 2024 16:29:30 -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 2/3] openrisc: Call setup_memory() earlier in the init sequence

The unflatten_and_copy_device_tree() function contains a call to
memblock_alloc(). This means that memblock is allocating memory before
any of the reserved memory regions are set aside in the setup_memory()
function which calls early_init_fdt_scan_reserved_mem(). Therefore,
there is a possibility for memblock to allocate from any of the
reserved memory regions.

Hence, move the call to setup_memory() to be earlier in the init
sequence so that the reserved memory regions are set aside before any
allocations are done using memblock.

Signed-off-by: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
---
 arch/openrisc/kernel/setup.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/openrisc/kernel/setup.c b/arch/openrisc/kernel/setup.c
index 9cf7fb6..be56eaa 100644
--- a/arch/openrisc/kernel/setup.c
+++ b/arch/openrisc/kernel/setup.c
@@ -255,6 +255,9 @@ void calibrate_delay(void)
 
 void __init setup_arch(char **cmdline_p)
 {
+	/* setup memblock allocator */
+	setup_memory();
+
 	unflatten_and_copy_device_tree();
 
 	setup_cpuinfo();
@@ -278,9 +281,6 @@ void __init setup_arch(char **cmdline_p)
 	}
 #endif
 
-	/* setup memblock allocator */
-	setup_memory();
-
 	/* paging_init() sets up the MMU and marks all pages as reserved */
 	paging_init();
 
--