linux-kernel - [PATCH v2] riscv: always honor the CONFIG_CMDLINE

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Message-ID: <PSBPR04MB399135DFC54928AB958D0638B1829@PSBPR04MB3991.apcprd04.prod.outlook.com>
Date:   Fri,  8 Jul 2022 16:38:22 -0400
From:   Wenting Zhang <zephray@...look.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Cc:     Wenting Zhang <zephray@...look.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] riscv: always honor the CONFIG_CMDLINE_FORCE when parsing dtb

When CONFIG_CMDLINE_FORCE is enabled, cmdline provided by
CONFIG_CMDLINE are always used. This allows CONFIG_CMDLINE to be
used regardless of the result of device tree scanning.

This especially fixes the case where a device tree without the
chosen node is supplied to the kernel. In such cases,
early_init_dt_scan would return true. But inside
early_init_dt_scan_chosen, the cmdline won't be updated as there
is no chosen node in the device tree. As a result, CONFIG_CMDLINE
is not copied into boot_command_line even if CONFIG_CMDLINE_FORCE
is enabled. This commit allows properly update boot_command_line
in this situation.

Fixes: 8fd6e05c7463 ("arch: riscv: support kernel command line forcing when no DTB passed")
Signed-off-by: Wenting Zhang <zephray@...look.com>
---

ChangeLog:

v2: Add fixes in commit message; fix code style

 arch/riscv/kernel/setup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index f0f36a4a0e9b..061cf8db3156 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -251,10 +251,10 @@ static void __init parse_dtb(void)
 			pr_info("Machine model: %s\n", name);
 			dump_stack_set_arch_desc("%s (DT)", name);
 		}
-		return;
+	} else {
+		pr_err("No DTB passed to the kernel\n");
 	}
 
-	pr_err("No DTB passed to the kernel\n");
 #ifdef CONFIG_CMDLINE_FORCE
 	strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 	pr_info("Forcing kernel command line to: %s\n", boot_command_line);
-- 
2.34.1