linux-kernel - Re: file.c:undefined reference to `.dump

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Date:   Mon, 6 Jul 2020 15:04:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     kernel test robot <lkp@...el.com>
Cc:     Christoph Hellwig <hch@....de>, kbuild-all@...ts.01.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>, Jeremy Kerr <jk@...abs.org>
Subject: Re: file.c:undefined reference to `.dump_emit'

On Mon, Jul 6, 2020 at 12:17 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   dcb7fd82c75ee2d6e6f9d8cc71c52519ed52e258
> commit: 5456ffdee666c66e27ccc1006f9afe83ad55559f powerpc/spufs: simplify spufs core dumping
> date:   9 weeks ago
> config: powerpc64-randconfig-c003-20200706 (attached as .config)
> compiler: powerpc64-linux-gcc (GCC) 9.3.0
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
>    powerpc64-linux-ld: arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference to `mmu_pid_bits'
>    powerpc64-linux-ld: arch/powerpc/platforms/cell/spufs/file.o: in function `.spufs_proxydma_info_dump':
> >> file.c:(.text+0x4c68): undefined reference to `.dump_emit'
>    powerpc64-linux-ld: arch/powerpc/platforms/cell/spufs/file.o: in function `.spufs_dma_info_dump':
>    file.c:(.text+0x4d70): undefined reference to `.dump_emit'
>    powerpc64-linux-ld: arch/powerpc/platforms/cell/spufs/file.o: in function `.spufs_wbox_info_dump':
>    file.c:(.text+0x4df4): undefined reference to `.dump_emit'
>    powerpc64-linux-ld: arch/powerpc/platforms/cell/spufs/file.o: in function `.spufs_ibox_info_dump':
>    file.c:(.text+0x4e50): undefined reference to `.dump_emit'
>    powerpc64-linux-ld: arch/powerpc/platforms/cell/spufs/file.o: in function `.spufs_mbox_info_dump':
>    file.c:(.text+0x4eb0): undefined reference to `.dump_emit'
>    powerpc64-linux-ld: arch/powerpc/platforms/cell/spufs/file.o:file.c:(.text+0x4f10): more undefined references to `.dump_emit' follow

I'm sure there is a way to fix this properly with added complexity, either
making dump_emit() an empty inline function when CONFIG_COREDUMP
is disabled, or adding a lot of #ifdef checks in spufs itself.

In the interest of keeping things simple, I'd suggest doing this one instead:

--- a/arch/powerpc/platforms/cell/Kconfig
+++ b/arch/powerpc/platforms/cell/Kconfig
@@ -44,6 +44,7 @@ config SPU_FS
        tristate "SPU file system"
        default m
        depends on PPC_CELL
+       depends on COREDUMP
        select SPU_BASE
        help
          The SPU file system is used to access Synergistic Processing

I'll send a proper patch if there are no objections.

      Arnd