linux-kernel - [PATCH] of: print warning when cmdline overflows from bootargs

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Message-Id: <20251105082717.4040-1-enlin.mu@linux.dev>
Date: Wed,  5 Nov 2025 16:27:17 +0800
From: Enlin Mu <enlin.mu@...ux.dev>
To: robh@...nel.org,
	saravanak@...gle.com,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	enlin.mu@...soc.com,
	enlin.mu@...ux.dev
Subject: [PATCH] of: print warning when cmdline overflows from bootargs

From: Enlin Mu <enlin.mu@...oc.com>

add debug info. sometimes cmdline in dts is too long,
developers are not aware of the length limit of the
cmdline, resulting in some misjudgments.

Signed-off-by: Enlin Mu <enlin.mu@...oc.com>
---
 drivers/of/fdt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 0edd639898a6..077799b2f565 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1085,6 +1085,8 @@ int __init early_init_dt_scan_chosen(char *cmdline)
 	p = of_get_flat_dt_prop(node, "bootargs", &l);
 	if (p != NULL && l > 0)
 		strscpy(cmdline, p, min(l, COMMAND_LINE_SIZE));
+	if (l > COMMAND_LINE_SIZE)
+		pr_warn("cmdline overflows from bootargs\n");
 
 handle_cmdline:
 	/*
-- 
2.39.5