@@ -579,10 +579,13 @@ ifeq ($(KBUILD_EXTMOD),)
# To avoid any implicit rule to kick in, define an empty command
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
-# If .config is newer than include/config/auto.conf, someone tinkered
-# with it and forgot to run make oldconfig.
-# if auto.conf.cmd is missing then we are probably in a cleaned tree so
-# we execute the config step to be sure to catch updated Kconfig files
+# The actual configuration files used during the build are stored in
+# include/generated/ and include/config/. Update them if .config is newer than
+# include/config/auto.conf (which mirrors .config).
+#
+# The include/config/ tree manages dependencies between source files and
+# Kconfig symbols and lets us avoid doing a full rebuild whenever the
+# configuration is changed. See scripts/basic/fixdep.c
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
else
The comment above the silentoldconfig invocation is outdated. 'make oldconfig' updates just .config and doesn't touch the include/config/ tree. This came up in https://lkml.org/lkml/2018/2/12/415. While fixing the comment, make it more informative by explaining the purpose of the unfortunately named silentoldconfig. I can't make sense of the comment re. auto.conf.cmd and a cleaned tree. include/config/auto.conf and include/config/auto.conf.cmd are both created simultaneously by silentoldconfig (in scripts/kconfig/confdata.c, by conf_write_autoconf()), and nothing seems to remove auto.conf.cmd that wouldn't remove auto.conf. Remove that part of the comment rather than blindly copying it. It might be a leftover from an older way of doing things. The include/config/auto.conf.cmd prerequisite might be there to ensure that silentoldconfig gets rerun if conf_write_autoconf() fails between writing out auto.conf.cmd and auto.conf (a comment in the function indicates that auto.conf is deliberately written out last to mark completion of the operation). It seems the Makefile dependency between .config and include/config/auto.conf would already take care of that though, since .config would still be out of date re. include/config/auto.conf if the operation fails. Cop out and leave the prerequisite in for now though. Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com> --- Makefile | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)