[gustavoars:testing/WFAMNAE-next20240305 1/1] include/linux/container_of.h:20:54: error: invalid use of undefined type 'struct cm_work'

From: kernel test robot
Date: Tue Mar 05 2024 - 16:12:52 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/WFAMNAE-next20240305
head: 3a02035a7f980ddbf41dd11815bb4e5f29e104d5
commit: 3a02035a7f980ddbf41dd11815bb4e5f29e104d5 [1/1] treewide: Address -Wflex-array-member-not-at-end warnings
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20240306/202403060458.cPoZxP91-lkp@xxxxxxxxx/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240306/202403060458.cPoZxP91-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/202403060458.cPoZxP91-lkp@xxxxxxxxx/

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

In file included from include/linux/stddef.h:5,
from include/uapi/linux/posix_types.h:5,
from include/uapi/linux/types.h:14,
from include/linux/types.h:6,
from include/linux/kasan-checks.h:5,
from include/asm-generic/rwonce.h:26,
from ./arch/arc/include/generated/asm/rwonce.h:1,
from include/linux/compiler.h:299,
from include/linux/array_size.h:5,
from include/linux/string.h:6,
from fs/open.c:8:
>> include/linux/tty_buffer.h:14:24: warning: empty declaration
14 | struct llist_node free;
| ^~~~~~~~~~
include/uapi/linux/stddef.h:28:26: note: in definition of macro '__struct_group'
28 | struct { MEMBERS } ATTRS; \
| ^~~~~~~
include/linux/tty_buffer.h:11:9: note: in expansion of macro 'struct_group_tagged'
11 | struct_group_tagged(tty_buffer_hdr, hdr,
| ^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/stddef.h:28:34: warning: no semicolon at end of struct or union
28 | struct { MEMBERS } ATTRS; \
| ^
include/linux/stddef.h:81:9: note: in expansion of macro '__struct_group'
81 | __struct_group(TAG, NAME, /* no attrs */, MEMBERS)
| ^~~~~~~~~~~~~~
include/linux/tty_buffer.h:11:9: note: in expansion of macro 'struct_group_tagged'
11 | struct_group_tagged(tty_buffer_hdr, hdr,
| ^~~~~~~~~~~~~~~~~~~
>> include/linux/tty_buffer.h:14:24: warning: empty declaration
14 | struct llist_node free;
| ^~~~~~~~~~
include/uapi/linux/stddef.h:29:30: note: in definition of macro '__struct_group'
29 | struct TAG { MEMBERS } ATTRS NAME; \
| ^~~~~~~
include/linux/tty_buffer.h:11:9: note: in expansion of macro 'struct_group_tagged'
11 | struct_group_tagged(tty_buffer_hdr, hdr,
| ^~~~~~~~~~~~~~~~~~~
include/uapi/linux/stddef.h:29:38: warning: no semicolon at end of struct or union
29 | struct TAG { MEMBERS } ATTRS NAME; \
| ^
include/linux/stddef.h:81:9: note: in expansion of macro '__struct_group'
81 | __struct_group(TAG, NAME, /* no attrs */, MEMBERS)
| ^~~~~~~~~~~~~~
include/linux/tty_buffer.h:11:9: note: in expansion of macro 'struct_group_tagged'
11 | struct_group_tagged(tty_buffer_hdr, hdr,
| ^~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/mm_types.h:19,
from include/linux/mmzone.h:22,
from include/linux/gfp.h:7,
from include/linux/xarray.h:15,
from include/linux/list_lru.h:14,
from include/linux/fs.h:13,
from include/uapi/linux/aio_abi.h:31,
from fs/aio.c:18:
fs/aio.c: In function 'free_ioctx_reqs':
>> include/linux/container_of.h:20:54: error: invalid use of undefined type 'struct cm_work'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~
include/linux/workqueue.h:285:30: note: in definition of macro '__INIT_WORK_KEY'
285 | __init_work((_work), _onstack); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
include/linux/compiler_types.h:390:27: error: expression in static assertion is not an integer
390 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:285:30: note: in definition of macro '__INIT_WORK_KEY'
285 | __init_work((_work), _onstack); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
>> include/linux/stddef.h:16:33: error: invalid use of undefined type 'struct cm_work'
16 | #define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
| ^~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:285:30: note: in definition of macro '__INIT_WORK_KEY'
285 | __init_work((_work), _onstack); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/container_of.h:23:28: note: in expansion of macro 'offsetof'
23 | ((type *)(__mptr - offsetof(type, member))); })
| ^~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
>> include/linux/container_of.h:20:54: error: invalid use of undefined type 'struct cm_work'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~
include/linux/workqueue.h:286:18: note: in definition of macro '__INIT_WORK_KEY'
286 | (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
include/linux/compiler_types.h:390:27: error: expression in static assertion is not an integer
390 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:286:18: note: in definition of macro '__INIT_WORK_KEY'
286 | (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
>> include/linux/stddef.h:16:33: error: invalid use of undefined type 'struct cm_work'
16 | #define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
| ^~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:286:18: note: in definition of macro '__INIT_WORK_KEY'
286 | (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/container_of.h:23:28: note: in expansion of macro 'offsetof'
23 | ((type *)(__mptr - offsetof(type, member))); })
| ^~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
>> include/linux/container_of.h:20:54: error: invalid use of undefined type 'struct cm_work'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~
include/linux/workqueue.h:287:34: note: in definition of macro '__INIT_WORK_KEY'
287 | INIT_LIST_HEAD(&(_work)->entry); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
include/linux/compiler_types.h:390:27: error: expression in static assertion is not an integer
390 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:287:34: note: in definition of macro '__INIT_WORK_KEY'
287 | INIT_LIST_HEAD(&(_work)->entry); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
>> include/linux/stddef.h:16:33: error: invalid use of undefined type 'struct cm_work'
16 | #define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
| ^~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:287:34: note: in definition of macro '__INIT_WORK_KEY'
287 | INIT_LIST_HEAD(&(_work)->entry); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/container_of.h:23:28: note: in expansion of macro 'offsetof'
23 | ((type *)(__mptr - offsetof(type, member))); })
| ^~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
>> include/linux/container_of.h:20:54: error: invalid use of undefined type 'struct cm_work'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~
include/linux/workqueue.h:288:18: note: in definition of macro '__INIT_WORK_KEY'
288 | (_work)->func = (_func); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
include/linux/compiler_types.h:390:27: error: expression in static assertion is not an integer
390 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:288:18: note: in definition of macro '__INIT_WORK_KEY'
288 | (_work)->func = (_func); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~~~
include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
20 | static_assert(__same_type(*(ptr), ((type *)0)->member) || \
| ^~~~~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~
>> include/linux/stddef.h:16:33: error: invalid use of undefined type 'struct cm_work'
16 | #define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
| ^~~~~~~~~~~~~~~~~~
include/linux/workqueue.h:288:18: note: in definition of macro '__INIT_WORK_KEY'
288 | (_work)->func = (_func); \
| ^~~~~
include/linux/workqueue.h:300:9: note: in expansion of macro '__INIT_WORK'
300 | __INIT_WORK((_work), (_func), 0)
| ^~~~~~~~~~~
include/linux/workqueue.h:337:9: note: in expansion of macro 'INIT_WORK'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~
include/linux/container_of.h:23:28: note: in expansion of macro 'offsetof'
23 | ((type *)(__mptr - offsetof(type, member))); })
| ^~~~~~~~
include/linux/workqueue.h:337:19: note: in expansion of macro 'container_of'
337 | INIT_WORK(container_of(&(_work)->work, struct cm_work, hdr), (_func))
| ^~~~~~~~~~~~
fs/aio.c:640:9: note: in expansion of macro 'INIT_RCU_WORK'
640 | INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
| ^~~~~~~~~~~~~

vim +20 include/linux/container_of.h

d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 9
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 10 /**
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 11 * container_of - cast a member of a structure out to the containing structure
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 12 * @ptr: the pointer to the member.
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 13 * @type: the type of the container struct this is embedded in.
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 14 * @member: the name of the member within the struct.
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 15 *
7376e561fd2e01 Sakari Ailus 2022-10-24 16 * WARNING: any const qualifier of @ptr is lost.
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 17 */
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 18 #define container_of(ptr, type, member) ({ \
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 19 void *__mptr = (void *)(ptr); \
e1edc277e6f6df Rasmus Villemoes 2021-11-08 @20 static_assert(__same_type(*(ptr), ((type *)0)->member) || \
e1edc277e6f6df Rasmus Villemoes 2021-11-08 21 __same_type(*(ptr), void), \
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 22 "pointer type mismatch in container_of()"); \
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 23 ((type *)(__mptr - offsetof(type, member))); })
d2a8ebbf8192b8 Andy Shevchenko 2021-11-08 24

:::::: The code at line 20 was first introduced by commit
:::::: e1edc277e6f6dfb372216522dfc57f9381c39e35 linux/container_of.h: switch to static_assert

:::::: TO: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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