linux-kernel - [PATCH 1/2] riscv: mm: Return intended SATP mode for noXlvl options

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Message-Id: <20250722-satp-from-fdt-v1-1-5ba22218fa5f@pigmoral.tech>
Date: Tue, 22 Jul 2025 00:53:10 +0800
From: Junhui Liu <junhui.liu@...moral.tech>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Junhui Liu <junhui.liu@...moral.tech>
Subject: [PATCH 1/2] riscv: mm: Return intended SATP mode for noXlvl
 options

Change the return value of match_noXlvl() to return the SATP mode that
will be used, rather than the mode being disabled. This enables unified
logic for return value judgement with the function that obtains mmu-type
from the fdt, avoiding extra conversion. This only changes the naming,
with no functional impact.

Signed-off-by: Junhui Liu <junhui.liu@...moral.tech>
---
 arch/riscv/kernel/pi/cmdline_early.c | 4 ++--
 arch/riscv/mm/init.c                 | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/kernel/pi/cmdline_early.c b/arch/riscv/kernel/pi/cmdline_early.c
index fbcdc9e4e14322af0cedd31343aeb9403ba2dd14..389d086a071876dde2fd57ee6f6661e65c38b7c4 100644
--- a/arch/riscv/kernel/pi/cmdline_early.c
+++ b/arch/riscv/kernel/pi/cmdline_early.c
@@ -41,9 +41,9 @@ static char *get_early_cmdline(uintptr_t dtb_pa)
 static u64 match_noXlvl(char *cmdline)
 {
 	if (strstr(cmdline, "no4lvl"))
-		return SATP_MODE_48;
+		return SATP_MODE_39;
 	else if (strstr(cmdline, "no5lvl"))
-		return SATP_MODE_57;
+		return SATP_MODE_48;
 
 	return 0;
 }
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 8d0374d7ce8ed72320f58e4cea212d0e2bce8fd4..d03e02a92379f2338a4f4df0ab797a7859b83dfc 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -864,9 +864,9 @@ static __init void set_satp_mode(uintptr_t dtb_pa)
 
 	kernel_map.page_offset = PAGE_OFFSET_L5;
 
-	if (satp_mode_cmdline == SATP_MODE_57) {
+	if (satp_mode_cmdline == SATP_MODE_48) {
 		disable_pgtable_l5();
-	} else if (satp_mode_cmdline == SATP_MODE_48) {
+	} else if (satp_mode_cmdline == SATP_MODE_39) {
 		disable_pgtable_l5();
 		disable_pgtable_l4();
 		return;

-- 
2.50.1