bootconfig: Fix Kconfig help message for BOOT_CONFIG

Fix Kconfig help message since the bootconfig file is
only available to be appended to initramfs. And also
add a reference to the documentation.

Link: http://lkml.kernel.org/r/157949058031.25888.18399447161895787505.stgit@devnote2
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/init/Kconfig b/init/Kconfig
index ffd240fb88c304ad28d19739dd4d954c1e9c36dc..9506299a53e340d4255a32cba1c2e07a474bd8de 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1223,7 +1223,9 @@ config BOOT_CONFIG
        help
          Extra boot config allows system admin to pass a config file as
          complemental extension of kernel cmdline when booting.
-         The boot config file is usually attached at the end of initramfs.
+         The boot config file must be attached at the end of initramfs
+         with checksum and size.
+         See <file:Documentation/admin-guide/bootconfig.rst> for details.
 
          If unsure, say Y.