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From: Oreoluwa Babatunde <quic_obabatun@quicinc.com>
To: <chenhuacai@kernel.org>, <jonas@southpole.se>,
        <stefan.kristiansson@saunalahti.fi>, <shorne@gmail.com>,
        <ysato@users.sourceforge.jp>, <dalias@libc.org>,
        <glaubitz@physik.fu-berlin.de>, <robh+dt@kernel.org>,
        <frowand.list@gmail.com>
CC: <linux-openrisc@vger.kernel.org>, <loongarch@lists.linux.dev>,
        <linux-sh@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <kernel@quicinc.com>,
        Oreoluwa Babatunde
	<quic_obabatun@quicinc.com>
Subject: [PATCH 3/3] sh: Call paging_init() earlier in the init sequence
Date: Fri, 9 Feb 2024 16:29:31 -0800
Message-ID: <1707524971-146908-4-git-send-email-quic_obabatun@quicinc.com>
In-Reply-To: <1707524971-146908-1-git-send-email-quic_obabatun@quicinc.com>
References: <1707524971-146908-1-git-send-email-quic_obabatun@quicinc.com>
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The unflatten_device_tree() function contains a call to
memblock_alloc(). This is a problem because this allocation is done
before any of the reserved memory is set aside in paging_init().
This means that there is a possibility for memblock to allocate from
any of the memory regions that are supposed to be set aside as reserved.

Hence, move the call to paging_init() 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@quicinc.com>
---
 arch/sh/kernel/setup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index d3175f0..ea40798 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -322,6 +322,8 @@ void __init setup_arch(char **cmdline_p)
 	/* Let earlyprintk output early console messages */
 	sh_early_platform_driver_probe("earlyprintk", 1, 1);
 
+	paging_init();
+
 #ifdef CONFIG_OF_EARLY_FLATTREE
 #ifdef CONFIG_USE_BUILTIN_DTB
 	unflatten_and_copy_device_tree();
@@ -330,8 +332,6 @@ void __init setup_arch(char **cmdline_p)
 #endif
 #endif
 
-	paging_init();
-
 	/* Perform the machine specific initialisation */
 	if (likely(sh_mv.mv_setup))
 		sh_mv.mv_setup(cmdline_p);
--