[PATCH v3 1/4] riscv: Call early_ioremap_setup() before parsing the DTB

From: Chen Pei <cp0613@linux.alibaba.com>
To: pjw@kernel.org, palmer@dabbelt.com, alex@ghiti.fr,
	rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org,
	graf@amazon.com, shuah@kernel.org
Cc: guoren@kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-kselftest@vger.kernel.org, kexec@lists.infradead.org
Subject: [PATCH v3 1/4] riscv: Call early_ioremap_setup() before parsing the DTB
Date: Fri,  6 Nov 2026 15:14:56 +0800	[thread overview]
Message-ID: <20261106071459.2003-2-cp0613@linux.alibaba.com> (raw)
In-Reply-To: <20261106071459.2003-1-cp0613@linux.alibaba.com>

parse_dtb() can reach early_memremap(), whose return value is composed
from the slot table that early_ioremap_setup() fills in - and on RISC-V
that setup ran after the scan, so the mapping came back NULL. The DT
based kexec handover parsing is the first caller to hit this:
kho_populate() cannot map the handover FDT and the handover is dropped.

Run early_ioremap_setup() before parse_dtb(), as arm64 and x86 already
do.

Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
---
 arch/riscv/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index d79f99b86033..45e2ef9d32fa 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -308,12 +308,12 @@ extern void __init init_rt_signal_env(void);
 
 void __init setup_arch(char **cmdline_p)
 {
+	early_ioremap_setup();
 	parse_dtb();
 	setup_initial_init_mm(_stext, _etext, _edata, _end);
 
 	*cmdline_p = boot_command_line;
 
-	early_ioremap_setup();
 	sbi_init();
 	jump_label_init();
 	parse_early_param();
-- 
2.50.1


