From: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
To: Feng Tang <feng.tang@linux.alibaba.com>,
kernel test robot <lkp@intel.com>,
linuxppc-dev@lists.ozlabs.org,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
clang-built-linux@googlegroups.com
Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: ld.lld: error: relocation R_PPC_ADDR16_LO cannot be used against symbol 'init_task'; recompile with -fPIC
Date: Fri, 10 Jul 2026 06:33:49 +0200 [thread overview]
Message-ID: <37fe4a15-e51b-411e-9667-a1c670f413e1@kernel.org> (raw)
In-Reply-To: <alBeJUafPKhx8RMS@U-2FWC9VHC-2323.local>
+ 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]
>>
>> --
>> 0-DAY CI Kernel Test Service
>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fintel%2Flkp-tests%2Fwiki&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094952205%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=sqz%2BJ2dpT3ZZjlQyyvAhgPdP9jS0kJLpbRKTcV4rM50%3D&reserved=0
>
next prev parent reply other threads:[~2026-07-10 4:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 22:18 ld.lld: error: relocation R_PPC_ADDR16_LO cannot be used against symbol 'init_task'; recompile with -fPIC kernel test robot
2026-07-10 2:51 ` Feng Tang
2026-07-10 4:33 ` Christophe Leroy (CS GROUP) [this message]
2026-07-10 9:44 ` Feng Tang
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