kbuild: remove the unneeded comments for external module builds
The supported targets for external modules are listed in the help target
a few lines below. Let's not have duplicated information in two places.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/Makefile b/Makefile
index 2cbf68d..9b9a003 100644
--- a/Makefile
+++ b/Makefile
@@ -1711,17 +1711,7 @@
# When building external modules the kernel used as basis is considered
# read-only, and no consistency checks are made and the make
# system is not used on the basis kernel. If updates are required
-# in the basis kernel ordinary make commands (without M=...) must
-# be used.
-#
-# The following are the only valid targets when building external
-# modules.
-# make M=dir clean Delete all automatically generated files
-# make M=dir modules Make all modules in specified dir
-# make M=dir Same as 'make M=dir modules'
-# make M=dir modules_install
-# Install the modules built in the module directory
-# Assumes install directory is already created
+# in the basis kernel ordinary make commands (without M=...) must be used.
# We are always building only modules.
KBUILD_BUILTIN :=