On Thu, Jun 20, 2019 at 4:58 PM Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, Jun 20, 2019 at 06:54:42AM +0000, yamada.masahiro@xxxxxxxxxxxxx wrote: > > > > I cannot reproduce the build error on the latest Linus tree. > > > > > > $ make O=build allmodconfig fs/cifs/ > > > > perfectly works for me. > > I was trying to build just the fs/cifs directory with > > make O=build M=fs/cifs > > But I see now that this can't possibly work as M= only supports > absolute paths. As M= is supposed to replace SUBDIRS=, what are > we supposed to do to build just a directory? Documentation/kbuild/kbuild.txt says M= and KBUILD_EXTMOD (and older form SUBDIRS= too) are for building external modules. Yet, many people still wrongly use them to build in-kernel directories just because they seem to work (but do not really). The similar question, and the answer is here: https://lkml.org/lkml/2019/1/17/584 -- Best Regards Masahiro Yamada
