linux-kernel - Re: [PATCH] nvdimm: make CONFIG_NVDIMM

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Message-ID: <CAPcyv4gqKk+GfLAJVH20R+MFz3cqH=9Js6xRo9KaPZ8+Nm+-6Q@mail.gmail.com>
Date:   Thu, 27 Oct 2016 16:22:11 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH] nvdimm: make CONFIG_NVDIMM_DAX 'bool'

On Tue, Oct 25, 2016 at 8:52 AM, Arnd Bergmann <arnd@...db.de> wrote:
> A bugfix just tried to address a randconfig build problem and introduced
> a variant of the same problem: with CONFIG_LIBNVDIMM=y and
> CONFIG_NVDIMM_DAX=m, the nvdimm module now fails to link:
>
> drivers/nvdimm/built-in.o: In function `to_nd_device_type':
> bus.c:(.text+0x1b5d): undefined reference to `is_nd_dax'
> drivers/nvdimm/built-in.o: In function `nd_region_notify_driver_action.constprop.2':
> region_devs.c:(.text+0x6b6c): undefined reference to `is_nd_dax'
> region_devs.c:(.text+0x6b8c): undefined reference to `to_nd_dax'
> drivers/nvdimm/built-in.o: In function `nd_region_probe':
> region.c:(.text+0x70f3): undefined reference to `nd_dax_create'
> drivers/nvdimm/built-in.o: In function `mode_show':
> namespace_devs.c:(.text+0xa196): undefined reference to `is_nd_dax'
> drivers/nvdimm/built-in.o: In function `nvdimm_namespace_common_probe':
> (.text+0xa55f): undefined reference to `is_nd_dax'
> drivers/nvdimm/built-in.o: In function `nvdimm_namespace_common_probe':
> (.text+0xa56e): undefined reference to `to_nd_dax'
>
> This reverts the earlier fix, making NVDIMM_DAX a 'bool' option again
> as it should be (it gets linked into the libnvdimm module). To fix
> the original problem, I'm adding a dependency on LIBNVDIMM to
> DEV_DAX_PMEM, which ensures we can't have that one built-in if the
> rest is a module.
>
> Fixes: 4e65e9381c7a ("/dev/dax: fix Kconfig dependency build breakage")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks, applied.  I had originally thought that we should add a
LIBNVDIMM dependency to the NVDIMM_PFN dependency, but this should
behave like header includes.  If you use the symbol include the
header, don't assume another header will include the one you want.