10:03 a.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 30185b69a2d533c4ba6ca926b8390ce7de495e29
commit: 295bcca84916cb5079140a89fccb472bb8d1f6e2 linux/bits.h: add compile time sanity
check of GENMASK inputs
date: 4 months ago
config: s390-randconfig-r001-20200808 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 295bcca84916cb5079140a89fccb472bb8d1f6e2
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
All errors (new ones prefixed by >>):
drivers/mux/mmio.c: In function 'mux_mmio_probe':
drivers/mux/mmio.c:76:20: error: storage size of 'field' isn't known
76 | struct reg_field field;
| ^~~~~
In file included from include/linux/bits.h:23,
from include/linux/bitops.h:5,
from drivers/mux/mmio.c:8:
> include/linux/bits.h:25:21: error: first argument to
'__builtin_choose_expr' not a constant
25 |
(BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:16:62: note: in definition of macro
'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
| ^~~~~~~~~~~~~~~~~~~
drivers/mux/mmio.c:96:15: note: in expansion of macro 'GENMASK'
96 | if (mask != GENMASK(field.msb, field.lsb)) {
| ^~~~~~~
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/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
| ^~~~~~~~~~~~~~~~~
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
| ^~~~~~~~~~~~~~~~~~~
drivers/mux/mmio.c:96:15: note: in expansion of macro 'GENMASK'
96 | if (mask != GENMASK(field.msb, field.lsb)) {
| ^~~~~~~
drivers/mux/mmio.c:102:15: error: implicit declaration of function
'devm_regmap_field_alloc' [-Werror=implicit-function-declaration]
102 | fields[i] = devm_regmap_field_alloc(dev, regmap, field);
| ^~~~~~~~~~~~~~~~~~~~~~~
drivers/mux/mmio.c:76:20: warning: unused variable 'field' [-Wunused-variable]
76 | struct reg_field field;
| ^~~~~
cc1: some warnings being treated as errors
vim +/__builtin_choose_expr +25 include/linux/bits.h
15
16 /*
17 * Create a contiguous bitmask starting at bit position @l and ending at
18 * position @h. For example
19 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
20 */
21 #if !defined(__ASSEMBLY__) && \
22 (!defined(CONFIG_CC_IS_GCC) || CONFIG_GCC_VERSION >= 49000)
23 #include <linux/build_bug.h>
24 #define
GENMASK_INPUT_CHECK(h, l) \
25 (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
26 __builtin_constant_p((l) > (h)), (l) > (h), 0)))
27 #else
28 /*
29 * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
30 * disable the input check if that is the case.
31 */
32 #define GENMASK_INPUT_CHECK(h, l) 0
33 #endif
34
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org