linux-kernel - [PATCH AUTOSEL 6.4 52/54] LoongArch: Fix CMDLINE_EXTEND and CMDLINE

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Date:   Sun, 13 Aug 2023 11:49:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhihong Dong <donmor3000@...mail.com>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Sasha Levin <sashal@...nel.org>, chenhuacai@...nel.org,
        zhoubinbin@...ngson.cn, tangyouling@...ngson.cn, ardb@...nel.org,
        tglx@...utronix.de, yangtiezhu@...ngson.cn,
        loongarch@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.4 52/54] LoongArch: Fix CMDLINE_EXTEND and CMDLINE_BOOTLOADER handling

From: Zhihong Dong <donmor3000@...mail.com>

[ Upstream commit 83da30d73b86ab5898fb84f8b49c11557c3fcc67 ]

On FDT systems these command line processing are already taken care of
by early_init_dt_scan_chosen(). Add similar handling to the ACPI (non-
FDT) code path to allow these config options to work for ACPI (non-FDT)
systems too.

Signed-off-by: Zhihong Dong <donmor3000@...mail.com>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/loongarch/kernel/setup.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index 4444b13418f0e..a013da0e551a5 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -332,9 +332,25 @@ static void __init bootcmdline_init(char **cmdline_p)
 			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 
 		strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
+		goto out;
 	}
 #endif
 
+	/*
+	 * Append built-in command line to the bootloader command line if
+	 * CONFIG_CMDLINE_EXTEND is enabled.
+	 */
+	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
+		strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
+		strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+	}
+
+	/*
+	 * Use built-in command line if the bootloader command line is empty.
+	 */
+	if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
+		strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+
 out:
 	*cmdline_p = boot_command_line;
 }
-- 
2.40.1