linux-kernel - Re: WARNING: modpost: vmlinux.o(.text+0x74fea4): Section mismatch in reference from the function memblock_find_in_range_node() to the function .init.text:memblock_bottom

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Date:   Tue, 16 Mar 2021 09:23:09 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     kernel test robot <lkp@...el.com>, Arnd Bergmann <arnd@...db.de>,
        kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: WARNING: modpost: vmlinux.o(.text+0x74fea4): Section mismatch in
 reference from the function memblock_find_in_range_node() to the function .init.text:memblock_bottom_up()

On Tue, Mar 16, 2021 at 12:04 AM Mike Rapoport <rppt@...ux.ibm.com> wrote:
>
> On Tue, Mar 16, 2021 at 01:23:08AM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   1e28eed17697bcf343c6743f0028cc3b5dd88bf0
> > commit: 34dc2efb39a231280fd6696a59bbe712bf3c5c4a memblock: fix section mismatch warning
> > date:   2 days ago
> > config: arm64-randconfig-r013-20210315 (attached as .config)
> > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a28facba1ccdc957f386b7753f4958307f1bfde8)
> > 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=34dc2efb39a231280fd6696a59bbe712bf3c5c4a
> >         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >         git fetch --no-tags linus master
> >         git checkout 34dc2efb39a231280fd6696a59bbe712bf3c5c4a
> >         # 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 >>, old ones prefixed by <<):
> >
> > >> WARNING: modpost: vmlinux.o(.text+0x74fea4): Section mismatch in reference from the function memblock_find_in_range_node() to the function .init.text:memblock_bottom_up()
> > The function memblock_find_in_range_node() references
> > the function __init memblock_bottom_up().
> > This is often because memblock_find_in_range_node lacks a __init
> > annotation or the annotation of memblock_bottom_up is wrong.
>
> I don't have clang-13 setup handy so I could not check, but I think this
> should be the fix:

Thanks for taking another look:
https://lore.kernel.org/lkml/20210225205908.GM1447004@kernel.org/
Do we want to switch the above to the below?

>
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index d13e3cd938b4..5984fff3f175 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -460,7 +460,7 @@ static inline void memblock_free_late(phys_addr_t base, phys_addr_t size)
>  /*
>   * Set the allocation direction to bottom-up or top-down.
>   */
> -static inline __init void memblock_set_bottom_up(bool enable)
> +static inline __init_memblock void memblock_set_bottom_up(bool enable)
>  {
>         memblock.bottom_up = enable;
>  }
> @@ -470,7 +470,7 @@ static inline __init void memblock_set_bottom_up(bool enable)
>   * if this is true, that said, memblock will allocate memory
>   * in bottom-up direction.
>   */
> -static inline __init bool memblock_bottom_up(void)
> +static inline __init_memblock bool memblock_bottom_up(void)
>  {
>         return memblock.bottom_up;
>  }
>
>
> --
> Sincerely yours,
> Mike.
>
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-- 
Thanks,
~Nick Desaulniers