Re: [PATCH v2] kernfs: recheck of->released after acquiring the active reference
From: kernel test robot
Date: Sun Aug 23 2026 - 08:27:31 EST
Hi Fan,
kernel test robot noticed the following build errors:
[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on driver-core/driver-core-next driver-core/driver-core-linus linus/master v7.2 next-20260821]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Fan-Wu/kernfs-recheck-of-released-after-acquiring-the-active-reference/20260821-050720
base: driver-core/driver-core-testing
patch link: https://lore.kernel.org/r/20260821050720.14848-1-fanwu01%40zju.edu.cn
patch subject: [PATCH v2] kernfs: recheck of->released after acquiring the active reference
config: nios2-allnoconfig (https://download.01.org/0day-ci/archive/20260823/202608230052.ZXfVhNjk-lkp@xxxxxxxxx/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260823/202608230052.ZXfVhNjk-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/202608230052.ZXfVhNjk-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
In file included from include/asm-generic/div64.h:27,
from ./arch/nios2/include/generated/asm/div64.h:1,
from include/linux/math.h:6,
from include/linux/math64.h:6,
from include/linux/time.h:6,
from include/linux/stat.h:19,
from include/linux/fs_dirent.h:5,
from include/linux/fs/super_types.h:5,
from include/linux/fs/super.h:5,
from include/linux/fs.h:5,
from fs/kernfs/file.c:10:
fs/kernfs/file.c: In function 'kernfs_get_active_of':
>> include/linux/compiler_types.h:663:16: error: 'sizeof' applied to a bit-field
663 | (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
| ^
include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/linux/compiler_types.h:690:9: note: in expansion of macro '__compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ^~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/kernfs/file.c:76:22: note: in expansion of macro 'READ_ONCE'
76 | if (unlikely(READ_ONCE(of->released))) {
| ^~~~~~~~~
include/linux/compiler_types.h:663:45: error: 'sizeof' applied to a bit-field
663 | (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
| ^
include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/linux/compiler_types.h:690:9: note: in expansion of macro '__compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ^~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/kernfs/file.c:76:22: note: in expansion of macro 'READ_ONCE'
76 | if (unlikely(READ_ONCE(of->released))) {
| ^~~~~~~~~
include/linux/compiler_types.h:664:16: error: 'sizeof' applied to a bit-field
664 | sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
| ^
include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/linux/compiler_types.h:690:9: note: in expansion of macro '__compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ^~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/kernfs/file.c:76:22: note: in expansion of macro 'READ_ONCE'
76 | if (unlikely(READ_ONCE(of->released))) {
| ^~~~~~~~~
include/linux/compiler_types.h:664:44: error: 'sizeof' applied to a bit-field
664 | sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
| ^
include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/linux/compiler_types.h:690:9: note: in expansion of macro '__compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ^~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/kernfs/file.c:76:22: note: in expansion of macro 'READ_ONCE'
76 | if (unlikely(READ_ONCE(of->released))) {
| ^~~~~~~~~
>> include/asm-generic/rwonce.h:36:54: error: 'sizeof' applied to a bit-field
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^
include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/linux/compiler_types.h:690:9: note: in expansion of macro '__compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ^~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/kernfs/file.c:76:22: note: in expansion of macro 'READ_ONCE'
76 | if (unlikely(READ_ONCE(of->released))) {
| ^~~~~~~~~
>> include/linux/compiler_types.h:626:17: error: 'typeof' applied to a bit-field
626 | _Generic((x), \
| ^~~~~~~~
include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/asm-generic/rwonce.h:44:43: note: in expansion of macro '__unqual_scalar_typeof'
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); \
| ^~~~~~~~~~~
fs/kernfs/file.c:76:22: note: in expansion of macro 'READ_ONCE'
76 | if (unlikely(READ_ONCE(of->released))) {
| ^~~~~~~~~
>> include/asm-generic/rwonce.h:44:71: error: cannot take address of bit-field 'released'
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ^
include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
fs/kernfs/file.c:76:22: note: in expansion of macro 'READ_ONCE'
76 | if (unlikely(READ_ONCE(of->released))) {
| ^~~~~~~~~
vim +/sizeof +663 include/linux/compiler_types.h
d15155824c5014 Will Deacon 2017-10-24 611
dee081bf8f824c Will Deacon 2019-12-19 612 /*
dee081bf8f824c Will Deacon 2019-12-19 613 * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
dee081bf8f824c Will Deacon 2019-12-19 614 * non-scalar types unchanged.
1fd76043ecb04b Marco Elver 2020-05-27 615 */
fd69b2f7d5f4e1 Peter Zijlstra 2026-01-16 616 #ifndef USE_TYPEOF_UNQUAL
1fd76043ecb04b Marco Elver 2020-05-27 617 /*
6ec4476ac82512 Linus Torvalds 2020-07-08 618 * Prefer C11 _Generic for better compile-times and simpler code. Note: 'char'
1fd76043ecb04b Marco Elver 2020-05-27 619 * is not type-compatible with 'signed char', and we define a separate case.
1fd76043ecb04b Marco Elver 2020-05-27 620 */
1fd76043ecb04b Marco Elver 2020-05-27 621 #define __scalar_type_to_expr_cases(type) \
1fd76043ecb04b Marco Elver 2020-05-27 622 unsigned type: (unsigned type)0, \
1fd76043ecb04b Marco Elver 2020-05-27 623 signed type: (signed type)0
1fd76043ecb04b Marco Elver 2020-05-27 624
1fd76043ecb04b Marco Elver 2020-05-27 625 #define __unqual_scalar_typeof(x) typeof( \
1fd76043ecb04b Marco Elver 2020-05-27 @626 _Generic((x), \
1fd76043ecb04b Marco Elver 2020-05-27 627 char: (char)0, \
1fd76043ecb04b Marco Elver 2020-05-27 628 __scalar_type_to_expr_cases(char), \
1fd76043ecb04b Marco Elver 2020-05-27 629 __scalar_type_to_expr_cases(short), \
1fd76043ecb04b Marco Elver 2020-05-27 630 __scalar_type_to_expr_cases(int), \
1fd76043ecb04b Marco Elver 2020-05-27 631 __scalar_type_to_expr_cases(long), \
1fd76043ecb04b Marco Elver 2020-05-27 632 __scalar_type_to_expr_cases(long long), \
1fd76043ecb04b Marco Elver 2020-05-27 633 default: (x)))
fd69b2f7d5f4e1 Peter Zijlstra 2026-01-16 634 #else
fd69b2f7d5f4e1 Peter Zijlstra 2026-01-16 635 #define __unqual_scalar_typeof(x) __typeof_unqual__(x)
fd69b2f7d5f4e1 Peter Zijlstra 2026-01-16 636 #endif
c06cd66387da92 Thomas Gleixner 2026-06-02 637
c06cd66387da92 Thomas Gleixner 2026-06-02 638 #include <asm/percpu_types.h>
c06cd66387da92 Thomas Gleixner 2026-06-02 639
fd69b2f7d5f4e1 Peter Zijlstra 2026-01-16 640 #endif /* !__ASSEMBLY__ */
dee081bf8f824c Will Deacon 2019-12-19 641
38a68b982dd0b1 Peter Zijlstra 2025-11-27 642 /*
38a68b982dd0b1 Peter Zijlstra 2025-11-27 643 * __signed_scalar_typeof(x) - Declare a signed scalar type, leaving
38a68b982dd0b1 Peter Zijlstra 2025-11-27 644 * non-scalar types unchanged.
38a68b982dd0b1 Peter Zijlstra 2025-11-27 645 */
38a68b982dd0b1 Peter Zijlstra 2025-11-27 646
38a68b982dd0b1 Peter Zijlstra 2025-11-27 647 #define __scalar_type_to_signed_cases(type) \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 648 unsigned type: (signed type)0, \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 649 signed type: (signed type)0
38a68b982dd0b1 Peter Zijlstra 2025-11-27 650
38a68b982dd0b1 Peter Zijlstra 2025-11-27 651 #define __signed_scalar_typeof(x) typeof( \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 652 _Generic((x), \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 653 char: (signed char)0, \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 654 __scalar_type_to_signed_cases(char), \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 655 __scalar_type_to_signed_cases(short), \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 656 __scalar_type_to_signed_cases(int), \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 657 __scalar_type_to_signed_cases(long), \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 658 __scalar_type_to_signed_cases(long long), \
38a68b982dd0b1 Peter Zijlstra 2025-11-27 659 default: (x)))
38a68b982dd0b1 Peter Zijlstra 2025-11-27 660
d15155824c5014 Will Deacon 2017-10-24 661 /* Is this type a native word size -- useful for atomic operations */
815f0ddb346c19 Nick Desaulniers 2018-08-22 662 #define __native_word(t) \
815f0ddb346c19 Nick Desaulniers 2018-08-22 @663 (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
815f0ddb346c19 Nick Desaulniers 2018-08-22 664 sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
815f0ddb346c19 Nick Desaulniers 2018-08-22 665
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