linux-kernel - Re: WARNING: lib/test_bitmap.o(.text.unlikely+0x5c): Section mismatch in reference from the function bitmap_copy_clear_tail() to the variable .init.rodata:clump

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Date:   Fri, 13 Dec 2019 13:16:49 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     kbuild test robot <lkp@...el.com>,
        Max Filippov <jcmvbkbc@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: WARNING: lib/test_bitmap.o(.text.unlikely+0x5c): Section
 mismatch in reference from the function bitmap_copy_clear_tail() to the
 variable .init.rodata:clump_exp

On Tue, Dec 10, 2019 at 04:17:03AM +0800, kbuild test robot wrote:

+Cc: Max for xtensa matters, perhaps he has an idea.

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   e42617b825f8073569da76dc4510bfa019b1c35a
> commit: 30544ed5de431fe25d3793e4dd5a058d877c4d77 lib/bitmap: introduce bitmap_replace() helper
> date:   5 days ago
> config: xtensa-randconfig-a001-20191209 (attached as .config)
> compiler: xtensa-linux-gcc (GCC) 7.5.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout 30544ed5de431fe25d3793e4dd5a058d877c4d77
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.5.0 make.cross ARCH=xtensa 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):

I'm not sure I got this (esp. relation to my patch).
The mentioned code definitely compiled for 32-bit (since only then mentioned
bitmap API is in use). I have tried to reproduce on i386 compilation (gcc 9.x),
but can't.

> >> WARNING: lib/test_bitmap.o(.text.unlikely+0x5c): Section mismatch in reference from the function bitmap_copy_clear_tail() to the variable .init.rodata:clump_exp
>    The function bitmap_copy_clear_tail() references
>    the variable __initconst clump_exp.
>    This is often because bitmap_copy_clear_tail lacks a __initconst
>    annotation or the annotation of clump_exp is wrong.
> 
> ---
> 0-DAY kernel test infrastructure                 Open Source Technology Center
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation



-- 
With Best Regards,
Andy Shevchenko