linux-kernel - Re: aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `arch/arm64/kernel/ftrace.o' being placed in section `.eh

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Message-ID: <20210130012505.GA2709570@localhost>
Date:   Fri, 29 Jan 2021 18:25:05 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Kees Cook <keescook@...omium.org>, kbuild-all@...ts.01.org,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from
 `arch/arm64/kernel/ftrace.o' being placed in section `.eh_frame'

On Sat, Jan 30, 2021 at 09:21:49AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   bec4c2968fce2f44ce62d05288a633cd99a722eb
> commit: b3e5d80d0c48c0cc7bce56473672f4e6e1210910 arm64/build: Warn on orphan section placement
> date:   5 months ago
> config: arm64-randconfig-r013-20210130 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 275c6af7d7f1ed63a03d05b4484413e447133269)
> 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
>         # install arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3e5d80d0c48c0cc7bce56473672f4e6e1210910
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout b3e5d80d0c48c0cc7bce56473672f4e6e1210910
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 
> 
> 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 >>):
> 
>    aarch64-linux-gnu-ld: warning: -z norelro ignored
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/main.o' being placed in section `.eh_frame'
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/version.o' being placed in section `.eh_frame'
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/do_mounts.o' being placed in section `.eh_frame'
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/do_mounts_rd.o' being placed in section `.eh_frame'
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/do_mounts_initrd.o' being placed in section `.eh_frame'
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/initramfs.o' being placed in section `.eh_frame'
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/calibrate.o' being placed in section `.eh_frame'
>    aarch64-linux-gnu-ld: warning: orphan section `.eh_frame' from `init/init_task.o' being placed in section `.eh_frame'

https://lore.kernel.org/lkml/20210130004650.2682422-1-nathan@kernel.org/

Cheers,
Nathan