On Wed, Mar 16, 2022 at 01:28:08AM +0900, Masahiro Yamada wrote: > On Tue, Mar 15, 2022 at 5:15 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > Index: linux-2.6/scripts/Makefile.build > > =================================================================== > > --- linux-2.6.orig/scripts/Makefile.build > > +++ linux-2.6/scripts/Makefile.build > > @@ -86,12 +86,18 @@ ifdef need-builtin > > targets-for-builtin += $(obj)/built-in.a > > endif > > > > -targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m))) > > +targets-for-modules := > > > Why do you need to change this line? > > > > > > > ifdef CONFIG_LTO_CLANG > > targets-for-modules += $(patsubst %.o, %.lto.o, $(filter %.o, $(obj-m))) > > endif > > > > +ifdef CONFIG_X86_KERNEL_IBT > > +targets-for-modules += $(patsubst %.o, %.objtool, $(filter %.o, $(obj-m))) > > +endif > > + > > +targets-for-modules += $(patsubst %.o, %.mod, $(filter %.o, $(obj-m))) > > + > > ifdef need-modorder > > targets-for-modules += $(obj)/modules.order > > endif The thinking was that by having the .objtool rule before the .mod rule, objtool runs first. If mod runs before objtool, objtool will change the timestamp and then mod will get remade, even if nothing's changed.
