Re: [kbuild-all] make[2]: *** No rule to make target 'tools/testing/nvdimm//config_check.o', needed by 'tools/testing/nvdimm//dax.o'.

[Fengguang Wu]

On Tue, Aug 23, 2016 at 04:42:15PM -0700, Dan Williams wrote:
> On Mon, Aug 22, 2016 at 5:26 AM, Yilong Ren <yilongx.ren@xxxxxxxxx> wrote:
> > Hi, Williams
> >
> > On Mon, Aug 15, 2016 at 06:30:48PM -0700, Dan Williams wrote:
> > > On Mon, Aug 15, 2016 at 6:26 PM, Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:
> > > > On Mon, Aug 15, 2016 at 05:58:36PM -0700, Dan Williams wrote:
> > > >>
> > > >> On Mon, Aug 15, 2016 at 3:03 AM, kbuild test robot
> > > >> <fengguang.wu@xxxxxxxxx> wrote:
> > > >>>
> > > >>> tree:
> > > >>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > >>> head:   694d0d0bb2030d2e36df73e2d23d5770511dbc8d
> > > >>> commit: ab68f26221366f92611650e8470e6a926801c7d4 /dev/dax, pmem: direct
> > > >>> access to persistent memory
> > > >>> date:   3 months ago
> > > >>> config: i386-randconfig-i1-201633 (attached as .config)
> > > >>> compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
> > > >>> reproduce:
> > > >>>         git checkout ab68f26221366f92611650e8470e6a926801c7d4
> > > >>>         # save the attached .config to linux build tree
> > > >>>         make ARCH=i386
> > > >>>
> > > >>> All errors (new ones prefixed by >>):
> > > >>>
> > > >>>>> make[2]: *** No rule to make target
> > > >>>>> 'tools/testing/nvdimm//config_check.o', needed by
> > > >>>>> 'tools/testing/nvdimm//dax.o'.
> > > >>>
> > > >>>    make[2]: Target '__build' not remade because of errors.
> > > >>
> > > >>
> > > >> I think this is an invalid build test.  tools/testing/nvdimm/ uses a
> > > >> external module Kbuild environment, not Kconfig.  So, there's nothing
> > > >> I can do to prevent this compile error, unless there's some other way
> > > >> 0-day could determine the configuration dependencies?
> > > >
> > > >
> > > > Yeah if you can offer a concrete rule for the dependency, we'll add
> > > > it to 0-day.
> > >
> > > Sounds good.  The config_check.c file itself lists the dependencies:
> > >
> > > void check(void)
> > > {
> > >         /*
> > >          * These kconfig symbols must be set to "m" for nfit_test to
> > >          * load and operate.
> > >          */
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_LIBNVDIMM));
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_BLK_DEV_PMEM));
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_ND_BTT));
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_ND_PFN));
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_ND_BLK));
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_ACPI_NFIT));
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_DEV_DAX));
> > >         BUILD_BUG_ON(!IS_MODULE(CONFIG_DEV_DAX_PMEM));
> > > }
> >
> > will get the following error info after set all above kconfig to be "m":
> > /kbuild/src/lkp/Makefile:1478: recipe for target '_module_tools/testing/nvdimm/' failed
> >
> > Would you please help to take a look? thanks.
> >
> > reproduce:
> >         git checkout 29b4817d4018df78086157ea3a55c1d9424a7cfc (v4.8-rc1)
> >         # save the attached .config to linux build tree
> >     make HOSTCC=gcc-6 CC=gcc-6 ARCH=x86_64 prepare
> >     make HOSTCC=gcc-6 CC=gcc-6 ARCH=x86_64 modules_prepare
> >     make HOSTCC=gcc-6 CC=gcc-6 ARCH=x86_64 M=tools/testing/nvdimm/
> >
> > error info:
> > /usr/bin/timeout -k 100 3h /usr/bin/make HOSTCC=gcc-6 CC=gcc-6 -j100 -C source O=/kbuild/obj/lkp/x86_64-rhel-7.2 ARCH=x86_64 M=tools/testing/nvdimm/
> > make: Entering directory '/kbuild/src/lkp'
> > make[1]: Entering directory '/kbuild/obj/lkp/x86_64-rhel-7.2'
> >   LD      tools/testing/nvdimm//built-in.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/core.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/bus.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/dimm.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/region_devs.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/region.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/dimm_devs.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/label.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/namespace_devs.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/btt_devs.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/pfn_devs.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/claim.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/dax_devs.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/pmem.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/blk.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/e820.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/acpi/nfit/core.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/nvdimm/btt.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/acpi/nfit/mce.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/dax/dax.o
> >   CC [M]  tools/testing/nvdimm//../../../drivers/dax/pmem.o
> >   LD      tools/testing/nvdimm//test/built-in.o
> >   CC [M]  tools/testing/nvdimm//test/nfit.o
> >   CC [M]  tools/testing/nvdimm//test/iomap.o
> >   LD [M]  tools/testing/nvdimm//test/nfit_test_iomap.o
> >   LD [M]  tools/testing/nvdimm//test/nfit_test.o
> > /kbuild/src/lkp/Makefile:1478: recipe for target '_module_tools/testing/nvdimm/' failed   <======
>
> I was not able to reproduce this, I tried on Fedora 23 and Fedora 24
> and both attempts succeeded.

Hi Dan, it looks the error only happens with separated obj dir, when
KBUILD_OUTPUT or "-C .. O=.." is used in make command line.

Thanks,
Fengguang