Re: ld.lld: error: relocation R_PPC_ADDR16_LO cannot be used against symbol 'init_task'; recompile with -fPIC

[Christophe Leroy (CS GROUP)]

+ Clang

Le 10/07/2026 à 04:51, Feng Tang a écrit :
Thanks for the report!
Add Powerpc list.

This is a Clang build with Clang linker, did you reproduce the problem 
with a normal GCC build ?

Thanks
Christophe


On Fri, Jul 10, 2026 at 06:18:50AM +0800, kernel test robot wrote:
tree:   
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094863506%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=fQm6QfsJ2ggaKoRJWCz4dsaquz7Wo3uhRnOexVUrTnQ%3D&reserved=0
 master
head:   0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53
commit: d5cae2261b86913e602452ce4a07e6aefc0f603b dma-contiguous: simplify numa 
cma area handling
date:   6 weeks ago
config: powerpc-randconfig-r133-20260709 
(https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20260710%2F202607100652.WPUlEAfx-lkp%40intel.com%2Fconfig&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094899182%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=BkT0BYyJtniz6YPzGpYbO0jn2T7vBDBLaK2Tsh1LcnE%3D&reserved=0)
compiler: clang version 21.1.8 
(https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fllvm%2Fllvm-project&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094917538%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5%2BLVtRoojuNbhEMr3BhM2xF50PV%2FIYh%2FWw3ipDIWG%2FY%3D&reserved=0
 2078da43e25a4623cab2d0d60decddf709aaea28)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): 
(https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20260710%2F202607100652.WPUlEAfx-lkp%40intel.com%2Freproduce&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094935016%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2BrpcCLuNecZIfyF6N5X%2FFcHhdG9YzLBAErvBGHyjjak%3D&reserved=0)


All errors (new ones prefixed by >>):

ld.lld: error: relocation R_PPC_ADDR16_LO cannot be used against symbol 
'init_task'; recompile with -fPIC
    >>> defined in vmlinux.a(init/init_task.o)
    >>> referenced by head_44x.S:101 (arch/powerpc/kernel/head_44x.S:101)
    >>>               arch/powerpc/kernel/head_44x.o:(.head.text+0x42) in 
archive vmlinux.a
--
ld.lld: error: relocation R_PPC_ADDR16_HI cannot be used against symbol 
'init_thread_union'; recompile with -fPIC
    >>> defined in ./arch/powerpc/kernel/vmlinux.lds:133
    >>> referenced by head_44x.S:108 (arch/powerpc/kernel/head_44x.S:108)
    >>>               arch/powerpc/kernel/head_44x.o:(.head.text+0x4e) in 
archive vmlinux.a

I checked the patch and couldn't find obvious clue between the patch and
the error.

commit d5cae2261b8691 only changes kernel/dma/contiguous.c, which is under
CONFIG_DMA_CMA per kernel/dma/Makefile. In your config above, CONFIG_DMA_CMA
is not even set, so the contigous.c should not be compiled. Could you help
to double check? thanks!

- Feng

Kconfig warnings: (for reference only)
    WARNING: unmet direct dependencies detected for HOTPLUG_CPU
    Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || 
PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
    Selected by [y]:
    - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || 
ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]

--
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