Re: [PATCH v2 2/2] kbuild: link lib-y objects to vmlinux forcibly when CONFIG_MODULES=y

Masahiro Yamada
2020-03-12T06:13:17Z

Hi MIPS forks,

I got the following report from 0-day bot.
Please advise me how to fix it.

I am not sure how multi-platform works in MIPS.

The cavium-octeon platform has its own implementation
of various functions.

So, vmlinux links different library routines
depending on whether CONFIG_CAVIUM_OCTEON_SOC, correct?

fw_init_cmdline():
arch/mips/cavium-octeon/setup.c
arch/mips/fw/lib/cmdline.c

__delay(), __udelay(), __ndelay():
arch/mips/cavium-octeon/csrc-octeon.c
arch/mips/lib/delay.S

memcpy(), memmove():
arch/mips/cavium-octeon/octeon-memcpy.S
arch/mips/lib/memcpy.S

FWIW, the following fixes the multiple definition errors.

diff --git a/arch/mips/fw/lib/cmdline.c b/arch/mips/fw/lib/cmdline.c
index 6ecda64ad184..6ac6e0493e1f 100644
--- a/arch/mips/fw/lib/cmdline.c
+++ b/arch/mips/fw/lib/cmdline.c
@@ -16,6 +16,7 @@ int fw_argc;
int *_fw_argv;
int *_fw_envp;

+#ifndef CONFIG_CAVIUM_OCTEON_SOC
void __init fw_init_cmdline(void)
{
int i;
@@ -41,6 +42,7 @@ void __init fw_init_cmdline(void)
strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
}
}
+#endif

char * __init fw_getcmdline(void)
{
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 479f50559c83..4cc98af4161a 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -3,10 +3,14 @@
# Makefile for MIPS-specific library files..
#

-lib-y += bitops.o csum_partial.o delay.o memcpy.o memset.o \
+lib-y += bitops.o csum_partial.o memset.o \
mips-atomic.o strncpy_user.o \
strnlen_user.o uncached.o

+ifneq ($(CONFIG_CAVIUM_OCTEON_SOC),y)
+lib-y += delay.o memcpy.o
+endif
+
obj-y += iomap_copy.o
obj-$(CONFIG_PCI) += iomap-pci.o
lib-$(CONFIG_GENERIC_CSUM) := $(filter-out csum_partial.o, $(lib-y))

On Thu, Mar 12, 2020 at 1:31 PM kbuild test robot <lkp@intel.com> wrote:
>
> Hi Masahiro,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on kbuild/for-next]
> [also build test ERROR on v5.6-rc5 next-20200311]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url: https://github.com/0day-ci/linux/commits/Masahiro-Yamada/sparc-revive-__HAVE_ARCH_STRLEN-for-32bit-sparc/20200312-073459
> base: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next
> config: mips-cavium_octeon_defconfig (attached as .config)
> compiler: mips64-linux-gcc (GCC) 9.2.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> GCC_VERSION=9.2.0 make.cross ARCH=mips
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
> mips64-linux-ld: arch/mips/fw/lib/cmdline.o: in function `fw_init_cmdline':
> >> cmdline.c:(.init.text+0x0): multiple definition of `fw_init_cmdline'; arch/mips/cavium-octeon/setup.o:setup.c:(.init.text+0xad8): first defined here
> mips64-linux-ld: arch/mips/lib/delay.o: in function `__delay':
> >> delay.c:(.text+0x0): multiple definition of `__delay'; arch/mips/cavium-octeon/csrc-octeon.o:csrc-octeon.c:(.text+0x80): first defined here
> mips64-linux-ld: arch/mips/lib/delay.o: in function `__udelay':
> >> delay.c:(.text+0x10): multiple definition of `__udelay'; arch/mips/cavium-octeon/csrc-octeon.o:csrc-octeon.c:(.text+0x8): first defined here
> mips64-linux-ld: arch/mips/lib/delay.o: in function `__ndelay':
> >> delay.c:(.text+0x50): multiple definition of `__ndelay'; arch/mips/cavium-octeon/csrc-octeon.o:csrc-octeon.c:(.text+0x40): first defined here
> mips64-linux-ld: arch/mips/lib/memcpy.o: in function `memmove':
> >> (.text+0x0): multiple definition of `memmove'; arch/mips/cavium-octeon/octeon-memcpy.o:(.text+0x3a0): first defined here
> mips64-linux-ld: arch/mips/lib/memcpy.o: in function `__rmemcpy':
> >> (.text+0x20): multiple definition of `__rmemcpy'; arch/mips/cavium-octeon/octeon-memcpy.o:(.text+0x3c0): first defined here
> mips64-linux-ld: arch/mips/lib/memcpy.o: in function `memcpy':
> >> (.text+0x80): multiple definition of `memcpy'; arch/mips/cavium-octeon/octeon-memcpy.o:(.text+0x0): first defined here
> mips64-linux-ld: arch/mips/lib/memcpy.o: in function `memcpy':
> >> (.text+0x84): multiple definition of `__copy_user'; arch/mips/cavium-octeon/octeon-memcpy.o:(.text+0x4): first defined here
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

--
Best Regards
Masahiro Yamada