linux-kernel - [PATCH 7/8] of: replace command line handling

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Message-Id: <20220929023301.3344694-8-danielwa@cisco.com>
Date:   Wed, 28 Sep 2022 19:32:53 -0700
From:   Daniel Walker <danielwa@...co.com>
To:     Will Deacon <will@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Rob Herring <robh@...nel.org>,
        Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sean Anderson <sean.anderson@...o.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     xe-linux-external@...co.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 7/8] of: replace command line handling

Rob Herring has complained about this section of code. I removed the
command line handling code to the cmdline.h header. This hopefully makes
it easier for Rob to maintain it (at least he doesn't have to look at it
directly anymore). I would like to add a Kconfig option called
OF_DEPRECATED_CMDLINE which an architecture would set if it uses this code.
This would allow a platform to use the cmdline.h and the added function
directly and remove the Kconfig option. This change would be in a subsequent
patch.

This code was boot tested on powerpc 32bit, powerpc 64bit without
any generic command line conversion.

Cc: xe-linux-external@...co.com
Signed-off-by: Daniel Walker <danielwa@...co.com>
---
 drivers/of/fdt.c        | 22 ++--------------------
 include/linux/cmdline.h | 33 ++++++++++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 21 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 1c573e7a60bc..94e8fa277857 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -27,6 +27,7 @@
 #include <linux/sysfs.h>
 #include <linux/random.h>
 #include <linux/kmemleak.h>
+#include <linux/cmdline.h>
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #include <asm/page.h>
@@ -1177,26 +1178,7 @@ int __init early_init_dt_scan_chosen(char *cmdline)
 
 	/* Retrieve command line */
 	p = of_get_flat_dt_prop(node, "bootargs", &l);
-	if (p != NULL && l > 0)
-		strlcpy(cmdline, p, min(l, COMMAND_LINE_SIZE));
-
-	/*
-	 * CONFIG_CMDLINE is meant to be a default in case nothing else
-	 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
-	 * is set in which case we override whatever was found earlier.
-	 */
-#ifdef CONFIG_CMDLINE
-#if defined(CONFIG_CMDLINE_EXTEND)
-	strlcat(cmdline, " ", COMMAND_LINE_SIZE);
-	strlcat(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
-#elif defined(CONFIG_CMDLINE_FORCE)
-	strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
-#else
-	/* No arguments from boot loader, use kernel's  cmdl*/
-	if (!((char *)cmdline)[0])
-		strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
-#endif
-#endif /* CONFIG_CMDLINE */
+	of_deprecated_cmdline_update(cmdline, p, l);
 
 	pr_debug("Command line is: %s\n", (char *)cmdline);
 
diff --git a/include/linux/cmdline.h b/include/linux/cmdline.h
index a94758a0f257..dc7793265aa3 100644
--- a/include/linux/cmdline.h
+++ b/include/linux/cmdline.h
@@ -103,4 +103,35 @@ __cmdline_add_builtin(
 
 #define cmdline_get_static_builtin(dest) \
 	(CMDLINE_STATIC_PREPEND CMDLINE_STATIC_APPEND)
-#endif
+
+#ifndef CONFIG_GENERIC_CMDLINE
+static inline bool of_deprecated_cmdline_update(char *cmdline, const char *dt_bootargs, int length)
+{
+	if (dt_bootargs != NULL && length > 0)
+		strlcpy(cmdline, dt_bootargs, min(length, COMMAND_LINE_SIZE));
+	/*
+	 * CONFIG_CMDLINE is meant to be a default in case nothing else
+	 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
+	 * is set in which case we override whatever was found earlier.
+	 */
+#ifdef CONFIG_CMDLINE
+#if defined(CONFIG_CMDLINE_EXTEND)
+	strlcat(cmdline, " ", COMMAND_LINE_SIZE);
+	strlcat(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#elif defined(CONFIG_CMDLINE_FORCE)
+	strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#else
+	/* No arguments from boot loader, use kernel's  cmdl*/
+	if (!((char *)cmdline)[0])
+		strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#endif /* CONFIG_CMDLINE_EXTEND */
+#endif /* CONFIG_CMDLINE */
+
+	return true;
+}
+#else
+static inline bool of_deprecated_cmdline_update(char *cmdline, const char *dt_bootargs, int length) { return false; }
+#endif /* CONFIG_GENERIC_CMDLINE */
+
+
+#endif /* _LINUX_CMDLINE_H */
-- 
2.25.1