linux-kernel - 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

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Message-ID: <20220406144419.GL4285@paulmck-ThinkPad-P17-Gen-1>
Date:   Wed, 6 Apr 2022 07:44:19 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     "Chen, Rong A" <rong.a.chen@...el.com>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
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

On Wed, Apr 06, 2022 at 07:11:27PM +0800, Chen, Rong A wrote:
> 
> 
> 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@...el.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.

Thank you for getting back to me.

Very well, I will ignore subsequent errors that look like this.  ;-)

							Thanx, Paul