linux-kernel - Re: [PATCH v7 2/4] lib/test_bitmap.c: Add for_each_set

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Date:   Fri, 5 Jun 2020 02:12:54 +0530
From:   Syed Nayyar Waris <syednwaris@...il.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kbuild-all@...ts.01.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 2/4] lib/test_bitmap.c: Add for_each_set_clump test cases

On Sun, May 31, 2020 at 12:50 AM kbuild test robot <lkp@...el.com> wrote:
>
> Hi Syed,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on b9bbe6ed63b2b9f2c9ee5cbd0f2c946a2723f4ce]
>
> url:    https://github.com/0day-ci/linux/commits/Syed-Nayyar-Waris/Introduce-the-for_each_set_clump-macro/20200524-130931
> base:    b9bbe6ed63b2b9f2c9ee5cbd0f2c946a2723f4ce
> config: x86_64-randconfig-s021-20200529 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.1-243-gc100a7ab-dirty
>         # save the attached .config to linux build tree
>         make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>
> >> WARNING: modpost: lib/test_bitmap.o(.data+0xe80): Section mismatch in reference from the variable clump_test_data to the variable .init.rodata:clump_exp1
> The variable clump_test_data references
> the variable __initconst clump_exp1
> If the reference is valid then annotate the
> variable with or __refdata (see linux/init.h) or name the variable:
>
> --
> >> WARNING: modpost: lib/test_bitmap.o(.data+0xec8): Section mismatch in reference from the variable clump_test_data to the variable .init.rodata:clump_exp2
> The variable clump_test_data references
> the variable __initconst clump_exp2
> If the reference is valid then annotate the
> variable with or __refdata (see linux/init.h) or name the variable:
>
> --
> >> WARNING: modpost: lib/test_bitmap.o(.data+0xf10): Section mismatch in reference from the variable clump_test_data to the variable .init.rodata:clump_exp3
> The variable clump_test_data references
> the variable __initconst clump_exp3
> If the reference is valid then annotate the
> variable with or __refdata (see linux/init.h) or name the variable:
>
> --
> >> WARNING: modpost: lib/test_bitmap.o(.data+0xf58): Section mismatch in reference from the variable clump_test_data to the variable .init.rodata:clump_exp4
> The variable clump_test_data references
> the variable __initconst clump_exp4
> If the reference is valid then annotate the
> variable with or __refdata (see linux/init.h) or name the variable:
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

HI All,

Regarding the above compilation warning reported by bot. I think this is
different than GENMASK.

I am unable to reproduce the compilation warning.

I ran the command:
make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'  lib/

But the compilation warning didn't show up. Can anyone please point to me
what I am doing wrong here? How shall I reproduce the warning? Thanks !

Regards
Syed Nayyar Waris