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Date: Tue, 13 Jun 2023 15:42:04 +0800
From: kernel test robot <lkp@...el.com>
To: Seung-Woo Kim <sw0312.kim@...sung.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org,
"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
Florian Fainelli <f.fainelli@...il.com>
Subject: lib/test_bitmap.c:926:2: error: call to '__compiletime_assert_190'
declared with 'error' attribute: BUILD_BUG_ON failed:
!__builtin_constant_p(res)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: fb054096aea0576f0c0a61c598e5e9676443ee86
commit: d539fee9f825b0c8eac049732c83562b28a483b5 ARM: 9253/1: ubsan: select ARCH_HAS_UBSAN_SANITIZE_ALL
date: 7 months ago
config: arm-randconfig-r034-20230613 (https://download.01.org/0day-ci/archive/20230613/202306131550.LosyU9Kt-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build):
mkdir -p ~/bin
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d539fee9f825b0c8eac049732c83562b28a483b5
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout d539fee9f825b0c8eac049732c83562b28a483b5
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306131550.LosyU9Kt-lkp@intel.com/
All errors (new ones prefixed by >>):
>> lib/test_bitmap.c:926:2: error: call to '__compiletime_assert_190' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(res)
926 | BUILD_BUG_ON(!__builtin_constant_p(res));
| ^
include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
| ^
include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^
include/linux/compiler_types.h:354:2: note: expanded from macro 'compiletime_assert'
354 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^
include/linux/compiler_types.h:342:2: note: expanded from macro '_compiletime_assert'
342 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
include/linux/compiler_types.h:335:4: note: expanded from macro '__compiletime_assert'
335 | prefix ## suffix(); \
| ^
<scratch space>:196:1: note: expanded from here
196 | __compiletime_assert_190
| ^
1 error generated.
vim +926 lib/test_bitmap.c
291f93ca339f5b Barry Song 2021-08-06 877
dc34d5036692c6 Alexander Lobakin 2022-06-24 878 static void __init test_bitmap_const_eval(void)
dc34d5036692c6 Alexander Lobakin 2022-06-24 879 {
dc34d5036692c6 Alexander Lobakin 2022-06-24 880 DECLARE_BITMAP(bitmap, BITS_PER_LONG);
dc34d5036692c6 Alexander Lobakin 2022-06-24 881 unsigned long initvar = BIT(2);
dc34d5036692c6 Alexander Lobakin 2022-06-24 882 unsigned long bitopvar = 0;
dc34d5036692c6 Alexander Lobakin 2022-06-24 883 unsigned long var = 0;
dc34d5036692c6 Alexander Lobakin 2022-06-24 884 int res;
dc34d5036692c6 Alexander Lobakin 2022-06-24 885
dc34d5036692c6 Alexander Lobakin 2022-06-24 886 /*
dc34d5036692c6 Alexander Lobakin 2022-06-24 887 * Compilers must be able to optimize all of those to compile-time
dc34d5036692c6 Alexander Lobakin 2022-06-24 888 * constants on any supported optimization level (-O2, -Os) and any
dc34d5036692c6 Alexander Lobakin 2022-06-24 889 * architecture. Otherwise, trigger a build bug.
dc34d5036692c6 Alexander Lobakin 2022-06-24 890 * The whole function gets optimized out then, there's nothing to do
dc34d5036692c6 Alexander Lobakin 2022-06-24 891 * in runtime.
dc34d5036692c6 Alexander Lobakin 2022-06-24 892 */
dc34d5036692c6 Alexander Lobakin 2022-06-24 893
dc34d5036692c6 Alexander Lobakin 2022-06-24 894 /*
dc34d5036692c6 Alexander Lobakin 2022-06-24 895 * Equals to `unsigned long bitmap[1] = { GENMASK(6, 5), }`.
dc34d5036692c6 Alexander Lobakin 2022-06-24 896 * Clang on s390 optimizes bitops at compile-time as intended, but at
dc34d5036692c6 Alexander Lobakin 2022-06-24 897 * the same time stops treating @bitmap and @bitopvar as compile-time
dc34d5036692c6 Alexander Lobakin 2022-06-24 898 * constants after regular test_bit() is executed, thus triggering the
dc34d5036692c6 Alexander Lobakin 2022-06-24 899 * build bugs below. So, call const_test_bit() there directly until
dc34d5036692c6 Alexander Lobakin 2022-06-24 900 * the compiler is fixed.
dc34d5036692c6 Alexander Lobakin 2022-06-24 901 */
dc34d5036692c6 Alexander Lobakin 2022-06-24 902 bitmap_clear(bitmap, 0, BITS_PER_LONG);
dc34d5036692c6 Alexander Lobakin 2022-06-24 903 #if defined(__s390__) && defined(__clang__)
dc34d5036692c6 Alexander Lobakin 2022-06-24 904 if (!const_test_bit(7, bitmap))
dc34d5036692c6 Alexander Lobakin 2022-06-24 905 #else
dc34d5036692c6 Alexander Lobakin 2022-06-24 906 if (!test_bit(7, bitmap))
dc34d5036692c6 Alexander Lobakin 2022-06-24 907 #endif
dc34d5036692c6 Alexander Lobakin 2022-06-24 908 bitmap_set(bitmap, 5, 2);
dc34d5036692c6 Alexander Lobakin 2022-06-24 909
dc34d5036692c6 Alexander Lobakin 2022-06-24 910 /* Equals to `unsigned long bitopvar = BIT(20)` */
dc34d5036692c6 Alexander Lobakin 2022-06-24 911 __change_bit(31, &bitopvar);
dc34d5036692c6 Alexander Lobakin 2022-06-24 912 bitmap_shift_right(&bitopvar, &bitopvar, 11, BITS_PER_LONG);
dc34d5036692c6 Alexander Lobakin 2022-06-24 913
dc34d5036692c6 Alexander Lobakin 2022-06-24 914 /* Equals to `unsigned long var = BIT(25)` */
dc34d5036692c6 Alexander Lobakin 2022-06-24 915 var |= BIT(25);
dc34d5036692c6 Alexander Lobakin 2022-06-24 916 if (var & BIT(0))
dc34d5036692c6 Alexander Lobakin 2022-06-24 917 var ^= GENMASK(9, 6);
dc34d5036692c6 Alexander Lobakin 2022-06-24 918
dc34d5036692c6 Alexander Lobakin 2022-06-24 919 /* __const_hweight<32|64>(GENMASK(6, 5)) == 2 */
dc34d5036692c6 Alexander Lobakin 2022-06-24 920 res = bitmap_weight(bitmap, 20);
dc34d5036692c6 Alexander Lobakin 2022-06-24 921 BUILD_BUG_ON(!__builtin_constant_p(res));
dc34d5036692c6 Alexander Lobakin 2022-06-24 922 BUILD_BUG_ON(res != 2);
dc34d5036692c6 Alexander Lobakin 2022-06-24 923
dc34d5036692c6 Alexander Lobakin 2022-06-24 924 /* !(BIT(31) & BIT(18)) == 1 */
dc34d5036692c6 Alexander Lobakin 2022-06-24 925 res = !test_bit(18, &bitopvar);
dc34d5036692c6 Alexander Lobakin 2022-06-24 @926 BUILD_BUG_ON(!__builtin_constant_p(res));
dc34d5036692c6 Alexander Lobakin 2022-06-24 927 BUILD_BUG_ON(!res);
dc34d5036692c6 Alexander Lobakin 2022-06-24 928
dc34d5036692c6 Alexander Lobakin 2022-06-24 929 /* BIT(2) & GENMASK(14, 8) == 0 */
dc34d5036692c6 Alexander Lobakin 2022-06-24 930 res = initvar & GENMASK(14, 8);
dc34d5036692c6 Alexander Lobakin 2022-06-24 931 BUILD_BUG_ON(!__builtin_constant_p(res));
dc34d5036692c6 Alexander Lobakin 2022-06-24 932 BUILD_BUG_ON(res);
dc34d5036692c6 Alexander Lobakin 2022-06-24 933
dc34d5036692c6 Alexander Lobakin 2022-06-24 934 /* ~BIT(25) */
dc34d5036692c6 Alexander Lobakin 2022-06-24 935 BUILD_BUG_ON(!__builtin_constant_p(~var));
dc34d5036692c6 Alexander Lobakin 2022-06-24 936 BUILD_BUG_ON(~var != ~BIT(25));
dc34d5036692c6 Alexander Lobakin 2022-06-24 937 }
dc34d5036692c6 Alexander Lobakin 2022-06-24 938
:::::: The code at line 926 was first introduced by commit
:::::: dc34d5036692c614eef23c1130ee42a201c316bf lib: test_bitmap: add compile-time optimization/evaluations assertions
:::::: TO: Alexander Lobakin <alexandr.lobakin@...el.com>
:::::: CC: Yury Norov <yury.norov@...il.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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