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

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Date:	Tue, 16 Aug 2016 09:41:02 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Johannes Thumshirn <jthumshirn@...e.de>, kbuild-all@...org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yilong Ren <yilongx.ren@...el.com>
Subject: Re: [kbuild-all] make[2]: *** No rule to make target
 'tools/testing/nvdimm//config_check.o', needed by
 'tools/testing/nvdimm//dax.o'.

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@...el.com> 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@...el.com> 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

If "y" is not a valid option, we'll need to adjust 0-day's dependency
specification for ndctl test:

wfg /c/lkp-tests% cat include/ndctl
need_kconfig:
- CONFIG_HAVE_DMA_CONTIGUOUS=y
- CONFIG_CMA=y
- CONFIG_DMA_CMA=y
- CONFIG_CMA_SIZE_MBYTES=200
- CONFIG_LIBNVDIMM
- CONFIG_BLK_DEV_PMEM
- CONFIG_ND_BLK
- CONFIG_BTT=y
- CONFIG_NVDIMM_PFN=y
- CONFIG_NVDIMM_DAX=y
- CONFIG_ZONE_DEVICE=y

In the above list, a bare "CONFIG_BLK_DEV_PMEM" means "y" or "m" are
both acceptable.

>         * 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));

Regards,
Fengguang