On Tue, Mar 02, 2021 at 05:25:17PM +0000, Christophe Leroy wrote:

This code provides architectures with a way to build command line
based on what is built in the kernel and what is handed over by the
bootloader, based on selected compile-time options.

Signed-off-by: Christophe Leroy <redacted>
---
 include/linux/cmdline.h | 62 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 include/linux/cmdline.h

Sorry, spotted a couple of other things...

+/*
+ * This function will append a builtin command line to the command
+ * line provided by the bootloader. Kconfig options can be used to alter
+ * the behavior of this builtin command line.
+ * @dest: The destination of the final appended/prepended string.
+ * @src: The starting string or NULL if there isn't one. Must not equal dest.
+ * @length: the length of dest buffer.
+ */
+static __always_inline void cmdline_build(char *dest, const char *src, size_t length)
+{
+	if (length <= 0)
+		return;

length is unsigned

+
+	dest[0] = 0;
+
+#ifdef CONFIG_CMDLINE
+	if (IS_ENABLED(CONFIG_CMDLINE_FORCE) || !src || !src[0]) {
+		cmdline_strlcat(dest, CONFIG_CMDLINE, length);
+		return;
+	}
+#endif
+	if (dest != src)

The kernel-doc says that @src "Must not equal dest".

Will