include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant

From: kernel test robot
Date: Sun Oct 01 2023 - 04:54:02 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e402b08634b398e9feb94902c7adcf05bb8ba47d
commit: 3f301dc292eb122eff61b8b2906e519154b0327f LoongArch: Replace -ffreestanding with finer-grained -fno-builtin's
date: 5 weeks ago
config: loongarch-loongson3_defconfig (https://download.01.org/0day-ci/archive/20231001/202310011601.XXYEwt2d-lkp@xxxxxxxxx/config)
compiler: loongarch64-linux-gcc (GCC) 12.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231001/202310011601.XXYEwt2d-lkp@xxxxxxxxx/reproduce)

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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310011601.XXYEwt2d-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

In file included from include/linux/percpu.h:13,
from include/linux/context_tracking_state.h:5,
from include/linux/hardirq.h:5,
from include/linux/interrupt.h:11,
from sound/pci/bt87x.c:11:
arch/loongarch/include/asm/percpu.h:20:4: error: #error compiler support for the model attribute is necessary when a recent assembler is used
20 | # error compiler support for the model attribute is necessary when a recent assembler is used
| ^~~~~
In file included from include/linux/init.h:5,
from sound/pci/bt87x.c:10:
>> include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:231:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
231 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~~~~~~~
include/linux/kernel.h:56:59: note: in expansion of macro '__must_be_array'
56 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
| ^~~~~~~~~~~~~~~
include/linux/moduleparam.h:517:20: note: in expansion of macro 'ARRAY_SIZE'
517 | = { .max = ARRAY_SIZE(array), .num = nump, \
| ^~~~~~~~~~
include/linux/moduleparam.h:501:9: note: in expansion of macro 'module_param_array_named'
501 | module_param_array_named(name, name, type, nump, perm)
| ^~~~~~~~~~~~~~~~~~~~~~~~
sound/pci/bt87x.c:33:1: note: in expansion of macro 'module_param_array'
33 | module_param_array(index, int, NULL, 0444);
| ^~~~~~~~~~~~~~~~~~
>> sound/pci/bt87x.c:27:12: warning: 'index' defined but not used [-Wunused-variable]
27 | static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* Exclude the first card */
| ^~~~~
--
In file included from include/linux/irqflags.h:18,
from include/linux/spinlock.h:59,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:7,
from include/linux/slab.h:16,
from sound/usb/card.c:26:
arch/loongarch/include/asm/percpu.h:20:4: error: #error compiler support for the model attribute is necessary when a recent assembler is used
20 | # error compiler support for the model attribute is necessary when a recent assembler is used
| ^~~~~
In file included from include/linux/bits.h:21,
from include/linux/bitops.h:6,
from sound/usb/card.c:23:
>> include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:231:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
231 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~~~~~~~
include/linux/kernel.h:56:59: note: in expansion of macro '__must_be_array'
56 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
| ^~~~~~~~~~~~~~~
include/linux/moduleparam.h:517:20: note: in expansion of macro 'ARRAY_SIZE'
517 | = { .max = ARRAY_SIZE(array), .num = nump, \
| ^~~~~~~~~~
include/linux/moduleparam.h:501:9: note: in expansion of macro 'module_param_array_named'
501 | module_param_array_named(name, name, type, nump, perm)
| ^~~~~~~~~~~~~~~~~~~~~~~~
sound/usb/card.c:81:1: note: in expansion of macro 'module_param_array'
81 | module_param_array(index, int, NULL, 0444);
| ^~~~~~~~~~~~~~~~~~
>> sound/usb/card.c:63:12: warning: 'index' defined but not used [-Wunused-variable]
63 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
| ^~~~~


vim +16 include/linux/build_bug.h

bc6245e5efd70c Ian Abbott 2017-07-10 6
bc6245e5efd70c Ian Abbott 2017-07-10 7 #ifdef __CHECKER__
bc6245e5efd70c Ian Abbott 2017-07-10 8 #define BUILD_BUG_ON_ZERO(e) (0)
bc6245e5efd70c Ian Abbott 2017-07-10 9 #else /* __CHECKER__ */
bc6245e5efd70c Ian Abbott 2017-07-10 10 /*
bc6245e5efd70c Ian Abbott 2017-07-10 11 * Force a compilation error if condition is true, but also produce a
8788994376d84d Rikard Falkeborn 2019-12-04 12 * result (of value 0 and type int), so the expression can be used
bc6245e5efd70c Ian Abbott 2017-07-10 13 * e.g. in a structure initializer (or where-ever else comma expressions
bc6245e5efd70c Ian Abbott 2017-07-10 14 * aren't permitted).
bc6245e5efd70c Ian Abbott 2017-07-10 15 */
8788994376d84d Rikard Falkeborn 2019-12-04 @16 #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
527edbc18a70e7 Masahiro Yamada 2019-01-03 17 #endif /* __CHECKER__ */
527edbc18a70e7 Masahiro Yamada 2019-01-03 18

:::::: The code at line 16 was first introduced by commit
:::::: 8788994376d84d627450fd0d67deb6a66ddf07d7 linux/build_bug.h: change type to int

:::::: TO: Rikard Falkeborn <rikard.falkeborn@xxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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