linux-kernel - Re: [PATCH v2] rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need

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Message-ID: <CALm+0cXzhGBa6v4d=Ky2QWJbfD_9neQJQWPGOp9USAaf=ghsWQ@mail.gmail.com>
Date: Wed, 3 Jul 2024 11:38:30 +0800
From: Z qiang <qiang.zhang1211@...il.com>
To: kernel test robot <lkp@...el.com>, Huacai Chen <chenhuacai@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] rcu-tasks: Fix access non-existent percpu rtpcp
 variable in rcu_tasks_need_gpcb()

>
> Hi Zqiang,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on paulmck-rcu/dev]
> [also build test WARNING on linus/master v6.10-rc2 next-20240604]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Zqiang/rcu-tasks-Fix-access-non-existent-percpu-rtpcp-variable-in-rcu_tasks_need_gpcb/20240604-165702
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
> patch link:    https://lore.kernel.org/r/20240604085401.14733-1-qiang.zhang1211%40gmail.com
> patch subject: [PATCH v2] rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()
> config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20240605/202406051045.FpU0Oi69-lkp@intel.com/config)
> compiler: loongarch64-linux-gcc (GCC) 13.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240605/202406051045.FpU0Oi69-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202406051045.FpU0Oi69-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):

Hi, Huacai

I don’t know why the following warning appears when compiling with
loongarch64-linux-gcc.

>
> >> kernel/rcu/update.o: warning: objtool: unexpected relocation symbol type in .rela.discard.unreachable

A similar problem also occurred at this link:
https://lore.kernel.org/oe-kbuild-all/202406211339.BCuCbD2g-lkp@intel.com/

Is there a patch fix for this warning?

Looking forward to your reply :) .

Thanks
Zqiang

>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki