On Fri, May 10, 2019 at 3:21 PM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Fri, May 10, 2019 at 03:12:05PM +0900, Masahiro Yamada wrote: > > Kconfig updates the .config when it exits even if its content is > > exactly the same as before. Since its timestamp becomes newer than > > that of other build artifacts, additional processing is invoked, > > which is annoying. > > > > - syncconfig is invoked to update include/config/auto.conf, etc. > > > > - kernel/config.o is recompiled if CONFIG_IKCONFIG is enabled, > > then vmlinux is relinked as well. > > > > If the .config is not changed at all, we do not have to even > > touch it. Just bail out showing "No change to .config". > > > > $ make allmodconfig > > scripts/kconfig/conf --allmodconfig Kconfig > > # > > # configuration written to .config > > # > > $ make allmodconfig > > scripts/kconfig/conf --allmodconfig Kconfig > > # > > # No change to .config > > # > > > > Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> > > Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> ? OK. For reviewers who do not know the context, please see this comment from Linus: https://lkml.org/lkml/2019/5/9/983 -- Best Regards Masahiro Yamada
