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Subject: Re: [kbuild-all] Re:
 [ammarfaizi2-block:paulmck/linux-rcu/fastexp.2022.04.01a 109/158] WARNING:
 modpost: vmlinux.o(.text+0xbcac06): Section mismatch in reference from the
 function ieee802154_iface_init() to the variable .init.text:.L0
To:     paulmck@kernel.org, kernel test robot <lkp@intel.com>
Cc:     kbuild-all@lists.01.org,
        GNU/Weeb Mailing List <gwml@vger.gnuweeb.org>,
        linux-kernel@vger.kernel.org
References: <202204040012.4Fu9uBps-lkp@intel.com>
 <20220403183040.GP4285@paulmck-ThinkPad-P17-Gen-1>
From:   "Chen, Rong A" <rong.a.chen@intel.com>
Message-ID: <53cf3eac-37d5-17d6-3805-416a71256e98@intel.com>
Date:   Wed, 6 Apr 2022 19:11:27 +0800
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On 4/4/2022 2:30 AM, Paul E. McKenney wrote:
> On Mon, Apr 04, 2022 at 12:20:22AM +0800, kernel test robot wrote:
>> tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/fastexp.2022.04.01a
>> head:   d9f3e7d671416fdf5b61f094765754269b652db0
>> commit: c1468fd1496363a0b2b2cb89e8ec2ba5e1dce9ba [109/158] rcu: Add polled expedited grace-period primitives
>> config: 	 (https://download.01.org/0day-ci/archive/20220404/202204040012.4Fu9uBps-lkp@intel.com/config)
>> compiler: riscv32-linux-gcc (GCC) 11.2.0
>> reproduce (this is a W=1 build):
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          # https://github.com/ammarfaizi2/linux-block/commit/c1468fd1496363a0b2b2cb89e8ec2ba5e1dce9ba
>>          git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
>>          git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/fastexp.2022.04.01a
>>          git checkout c1468fd1496363a0b2b2cb89e8ec2ba5e1dce9ba
>>          # save the config file to linux build tree
>>          mkdir build_dir
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@intel.com>
>>
>> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>>
>>>> WARNING: modpost: vmlinux.o(.text+0xbcac06): Section mismatch in reference from the function ieee802154_iface_init() to the variable .init.text:.L0
>> The function ieee802154_iface_init() references
>> the variable __init .L0 .
>> This is often because ieee802154_iface_init lacks a __init
>> annotation or the annotation of .L0 is wrong.
>>
>> Note: the below error/warnings can be found in parent commit:
>> << WARNING: modpost: vmlinux.o(.text+0x432e6): Section mismatch in reference from the function dma_get_required_mask() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0xe35ca): Section mismatch in reference from the function mlock_page_drain() to the variable .init.text:.LVL125
>> << WARNING: modpost: vmlinux.o(.text+0x96a46e): Section mismatch in reference from the function rpmsg_create_ept() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0x96a5b4): Section mismatch in reference from the function rpmsg_destroy_ept() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0x96a5c0): Section mismatch in reference from the function rpmsg_send() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0x96a5d4): Section mismatch in reference from the function rpmsg_sendto() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0x96a5e8): Section mismatch in reference from the function rpmsg_send_offchannel() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0x96a5fc): Section mismatch in reference from the function rpmsg_trysend() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0x96a610): Section mismatch in reference from the function rpmsg_trysendto() to the variable .init.text:.L0
>> << WARNING: modpost: vmlinux.o(.text+0x96a624): Section mismatch in reference from the function rpmsg_poll() to the variable .init.text:.L0
> 
> I freely confess that I have no idea what any of these error messages
> are trying to tell me.  What is ".init.txt.L0"?  How did my patch affect
> ieee802154_iface_init() or the register_netdevice_notifier() function
> that it invokes?  For that matter, how did my patch cause an access to
> be made to __init data from a non-__init function?
> 
> 							Thanx, Paul

Hi Paul,

Sorry for the inconvenience, only below warning was triggered by the commit:

 >> All warnings (new ones prefixed by >>, old ones prefixed by <<):
 >>
 >>>> WARNING: modpost: vmlinux.o(.text+0xbcac06): Section mismatch in 
reference from the function ieee802154_iface_init() to the variable 
.init.text:.L0

the others are for reference only:
 >> Note: the below error/warnings can be found in parent commit

The problem has existed for some time before your patch, we'll add it to
ignore list to avoid noise.

Best Regards,
Rong Chen