[gustavoars:testing/fsfa3 17/17] include/asm-generic/rwonce.h:44:26: error: array subscript 0 is outside array bounds of 'const volatile int[0]'
From: kernel test robot
Date: Sat Mar 25 2023 - 04:39:30 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/fsfa3
head: 2226ddb6a576f7f89a8a06a3f89b68f5109ded53
commit: 2226ddb6a576f7f89a8a06a3f89b68f5109ded53 [17/17] Makefile: Enable -Wstringop-overflow and -Warray-bounds
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20230325/202303251631.oyjkxqNQ-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 12.1.0
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
# https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=2226ddb6a576f7f89a8a06a3f89b68f5109ded53
git remote add gustavoars https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
git fetch --no-tags gustavoars testing/fsfa3
git checkout 2226ddb6a576f7f89a8a06a3f89b68f5109ded53
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202303251631.oyjkxqNQ-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
In file included from arch/s390/include/asm/rwonce.h:29,
from include/linux/compiler.h:247,
from include/linux/build_bug.h:5,
from include/linux/bits.h:21,
from drivers/net/wwan/t7xx/t7xx_state_monitor.c:17:
In function 'preempt_count',
inlined from 't7xx_fsm_append_event' at drivers/net/wwan/t7xx/t7xx_state_monitor.c:439:43:
>> include/asm-generic/rwonce.h:44:26: error: array subscript 0 is outside array bounds of 'const volatile int[0]' [-Werror=array-bounds]
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
arch/s390/include/asm/preempt.h:17:16: note: in expansion of macro 'READ_ONCE'
17 | return READ_ONCE(S390_lowcore.preempt_count) & ~PREEMPT_NEED_RESCHED;
| ^~~~~~~~~
In function 'preempt_count',
inlined from 't7xx_fsm_append_event' at drivers/net/wwan/t7xx/t7xx_state_monitor.c:439:43:
>> include/asm-generic/rwonce.h:44:26: error: array subscript 0 is outside array bounds of 'const volatile int[0]' [-Werror=array-bounds]
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
arch/s390/include/asm/preempt.h:17:16: note: in expansion of macro 'READ_ONCE'
17 | return READ_ONCE(S390_lowcore.preempt_count) & ~PREEMPT_NEED_RESCHED;
| ^~~~~~~~~
In function 'preempt_count',
inlined from 't7xx_fsm_append_event' at drivers/net/wwan/t7xx/t7xx_state_monitor.c:439:43:
>> include/asm-generic/rwonce.h:44:26: error: array subscript 0 is outside array bounds of 'const volatile int[0]' [-Werror=array-bounds]
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
arch/s390/include/asm/preempt.h:17:16: note: in expansion of macro 'READ_ONCE'
17 | return READ_ONCE(S390_lowcore.preempt_count) & ~PREEMPT_NEED_RESCHED;
| ^~~~~~~~~
cc1: all warnings being treated as errors
vim +44 include/asm-generic/rwonce.h
e506ea451254ab1 Will Deacon 2019-10-15 28
e506ea451254ab1 Will Deacon 2019-10-15 29 /*
e506ea451254ab1 Will Deacon 2019-10-15 30 * Yes, this permits 64-bit accesses on 32-bit architectures. These will
e506ea451254ab1 Will Deacon 2019-10-15 31 * actually be atomic in some cases (namely Armv7 + LPAE), but for others we
e506ea451254ab1 Will Deacon 2019-10-15 32 * rely on the access being split into 2x32-bit accesses for a 32-bit quantity
e506ea451254ab1 Will Deacon 2019-10-15 33 * (e.g. a virtual address) and a strong prevailing wind.
e506ea451254ab1 Will Deacon 2019-10-15 34 */
e506ea451254ab1 Will Deacon 2019-10-15 35 #define compiletime_assert_rwonce_type(t) \
e506ea451254ab1 Will Deacon 2019-10-15 36 compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
e506ea451254ab1 Will Deacon 2019-10-15 37 "Unsupported access size for {READ,WRITE}_ONCE().")
e506ea451254ab1 Will Deacon 2019-10-15 38
e506ea451254ab1 Will Deacon 2019-10-15 39 /*
e506ea451254ab1 Will Deacon 2019-10-15 40 * Use __READ_ONCE() instead of READ_ONCE() if you do not require any
3c9184109e78ea2 Will Deacon 2019-10-30 41 * atomicity. Note that this may result in tears!
e506ea451254ab1 Will Deacon 2019-10-15 42 */
b78b331a3f5c077 Will Deacon 2019-10-15 43 #ifndef __READ_ONCE
e506ea451254ab1 Will Deacon 2019-10-15 @44 #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
b78b331a3f5c077 Will Deacon 2019-10-15 45 #endif
e506ea451254ab1 Will Deacon 2019-10-15 46
:::::: The code at line 44 was first introduced by commit
:::::: e506ea451254ab17e0bf918ca36232fec2a9b10c compiler.h: Split {READ,WRITE}_ONCE definitions out into rwonce.h
:::::: TO: Will Deacon <will@xxxxxxxxxx>
:::::: CC: Will Deacon <will@xxxxxxxxxx>
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