linux-kernel - Re: [norov:fns 7/19] include/linux/compiler_types.h:352:45: error: call to '__compiletime_assert_600' declared with attribute error: BUILD_BUG_ON failed: !__builtin_constant

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Date:   Thu, 23 Jun 2022 13:08:20 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [norov:fns 7/19] include/linux/compiler_types.h:352:45: error: call to '__compiletime_assert_600' declared with attribute error: BUILD_BUG_ON failed: !__builtin_constant_p(res)

From: kernel test robot <lkp@...el.com>
Date: Thu, 23 Jun 2022 01:16:29 +0800

Hi Yury,

> tree:   https://github.com/norov/linux fns
> head:   dc85542660535a9072c3b98819f4b80ff182b92a
> commit: 2f52f0373b1a1bcf54a4aedc202518f6bed4c74f [7/19] lib: test_bitmap: add compile-time optimization/evaluations assertions
> config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220623/202206230121.wlBiPZcR-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
> reproduce (this is a W=1 build):
>         # https://github.com/norov/linux/commit/2f52f0373b1a1bcf54a4aedc202518f6bed4c74f
>         git remote add norov https://github.com/norov/linux
>         git fetch --no-tags norov fns
>         git checkout 2f52f0373b1a1bcf54a4aedc202518f6bed4c74f
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

Can't reproduce it at all on x86_64 with the attached config, were
there any other changes maybe that could cause this?

> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from <command-line>:
>    lib/test_bitmap.c: In function 'test_bitmap_const_eval':
> >> include/linux/compiler_types.h:352:45: error: call to '__compiletime_assert_600' declared with attribute error: BUILD_BUG_ON failed: !__builtin_constant_p(res)
>      352 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>          |                                             ^
>    include/linux/compiler_types.h:333:25: note: in definition of macro '__compiletime_assert'
>      333 |                         prefix ## suffix();                             \
>          |                         ^~~~~~
>    include/linux/compiler_types.h:352:9: note: in expansion of macro '_compiletime_assert'
>      352 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>          |         ^~~~~~~~~~~~~~~~~~~
>    include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>       39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>          |                                     ^~~~~~~~~~~~~~~~~~
>    include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>       50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>          |         ^~~~~~~~~~~~~~~~
>    lib/test_bitmap.c:904:9: note: in expansion of macro 'BUILD_BUG_ON'
>      904 |         BUILD_BUG_ON(!__builtin_constant_p(res));
>          |         ^~~~~~~~~~~~
> 
> 
> vim +/__compiletime_assert_600 +352 include/linux/compiler_types.h
> 
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  338  
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  339  #define _compiletime_assert(condition, msg, prefix, suffix) \
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  340  	__compiletime_assert(condition, msg, prefix, suffix)
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  341  
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  342  /**
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  343   * compiletime_assert - break build and emit msg if condition is false
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  344   * @condition: a compile-time constant condition to check
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  345   * @msg:       a message to emit if condition is false
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  346   *
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  347   * In tradition of POSIX assert, this macro will break the build if the
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  348   * supplied condition is *false*, emitting the supplied error message if the
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  349   * compiler has support to do so.
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  350   */
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  351  #define compiletime_assert(condition, msg) \
> eb5c2d4b45e3d2d Will Deacon 2020-07-21 @352  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> eb5c2d4b45e3d2d Will Deacon 2020-07-21  353  
> 
> :::::: The code at line 352 was first introduced by commit
> :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h
> 
> :::::: TO: Will Deacon <will@...nel.org>
> :::::: CC: Will Deacon <will@...nel.org>
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://01.org/lkp

Thanks,
Olek